SCN1A

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0001518 voltage-gated sodium channel complex	IBA GO_REF:0000033	ACCEPT	Summary: This annotation correctly identifies SCN1A as part of the voltage-gated sodium channel complex. As the pore-forming α-subunit, SCN1A associates with auxiliary β-subunits (SCN1B, SCN2B, SCN3B, SCN4B) to form the functional Nav1.1 complex. IBA evidence from phylogenetic analysis provides strong support for this cellular component annotation.
GO:0005248 voltage-gated sodium channel activity	IBA GO_REF:0000033	ACCEPT	Summary: This is the core molecular function of SCN1A. The protein directly mediates voltage-gated sodium channel activity through conformational changes that allow selective Na+ passage. This annotation captures the essential enzymatic function supported by UniProt catalytic activity data (Na+(in) = Na+(out)) and extensive experimental evidence. Supporting Evidence: file:human/SCN1A/SCN1A-deep-research-falcon.md Nav1.1 is a voltage-gated Na+ channel that opens with membrane depolarization to carry inward sodium current needed for action potential initiation/propagation.
GO:0035725 sodium ion transmembrane transport	IBA GO_REF:0000033	ACCEPT	Summary: This accurately describes the biological process mediated by SCN1A. The protein enables sodium ion transport across neuronal membranes, which is fundamental for action potential generation and propagation. IBA evidence from phylogenetic analysis strongly supports this core function.
GO:0086002 cardiac muscle cell action potential involved in contraction	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: While Nav1.1 sodium channels may be expressed in cardiac tissue, SCN1A is predominantly and specifically important in neuronal tissues, particularly GABAergic interneurons. Cardiac action potentials are primarily mediated by SCN5A (Nav1.5). This annotation represents over-annotation for SCN1A, which should be marked as peripheral to its core neuronal function.
GO:0099505 regulation of presynaptic membrane potential	IEA GO_REF:0000108	KEEP AS NON CORE	Summary: This annotation is consistent with SCN1A role in presynaptic terminals where voltage-gated sodium channels regulate membrane potential and neurotransmitter release. However, IEA evidence alone is relatively weak, and this represents a more specific function than the core sodium channel activity.
GO:0001518 voltage-gated sodium channel complex	IEA GO_REF:0000002	ACCEPT	Summary: Duplicate of earlier IBA annotation for the same GO term. This IEA annotation provides additional computational support for SCN1A being part of voltage-gated sodium channel complex, consistent with its role as the pore-forming α-subunit.
GO:0005216 monoatomic ion channel activity	IEA GO_REF:0000002	ACCEPT	Summary: This is a broader molecular function term that encompasses sodium channel activity. While accurate, it is less informative than the specific voltage-gated sodium channel activity annotation. This represents a valid but general annotation.
GO:0005248 voltage-gated sodium channel activity	IEA GO_REF:0000120	ACCEPT	Summary: Another annotation for the core molecular function of SCN1A with IEA evidence. This duplicates the IBA annotation but provides additional computational support for the essential voltage-gated sodium channel activity.
GO:0005261 monoatomic cation channel activity	IEA GO_REF:0000002	ACCEPT	Summary: This is a broader molecular function term that encompasses sodium channel activity. Sodium channels are indeed monoatomic cation channels, but this annotation is less specific than voltage-gated sodium channel activity. Still accurate but general.
GO:0005886 plasma membrane	IEA GO_REF:0000120	ACCEPT	Summary: Correct cellular component annotation. SCN1A is a multi-pass membrane protein embedded in the plasma membrane where it functions as a voltage-gated sodium channel. UniProt confirms this subcellular localization.
GO:0006811 monoatomic ion transport	IEA GO_REF:0000120	ACCEPT	Summary: This is a broad biological process term that encompasses sodium ion transport. While accurate (sodium is a monoatomic ion), it is less informative than the more specific sodium ion transmembrane transport annotation.
GO:0006814 sodium ion transport	IEA GO_REF:0000120	ACCEPT	Summary: This accurately describes a core biological process mediated by SCN1A. The protein enables sodium ion transport, which is fundamental for neuronal excitability and action potential propagation. This is a key function supported by extensive evidence.
GO:0016020 membrane	IEA GO_REF:0000120	MARK AS OVER ANNOTATED	Summary: This is a very general cellular component term. While SCN1A is indeed a membrane protein, this annotation provides minimal informative value compared to the more specific plasma membrane annotation.
GO:0055085 transmembrane transport	IEA GO_REF:0000002	MARK AS OVER ANNOTATED	Summary: This is a broad biological process term that encompasses the specific sodium ion transmembrane transport function. While accurate, it provides less informative value than more specific transport annotations.
GO:0001508 action potential	IEA GO_REF:0000117	ACCEPT	Summary: This annotation correctly identifies SCN1A role in action potentials. As the pore-forming subunit of Nav1.1, SCN1A directly mediates the depolarizing phase of action potentials by allowing Na+ influx. This is a core biological process supported by UniProt functional data.
GO:0005272 sodium channel activity	IEA GO_REF:0000043	ACCEPT	Summary: This annotation captures the core sodium channel activity of SCN1A. While slightly broader than voltage-gated sodium channel activity, it accurately describes the fundamental molecular function of the protein in enabling sodium ion passage through the membrane.
GO:0034220 monoatomic ion transmembrane transport	IEA GO_REF:0000043	ACCEPT	Summary: This is a broader biological process term that encompasses sodium ion transmembrane transport. While accurate (sodium is a monoatomic ion), the more specific sodium ion transmembrane transport annotation is more informative for SCN1A function.
GO:0034702 monoatomic ion channel complex	IEA GO_REF:0000043	ACCEPT	Summary: This is a broader cellular component term that encompasses voltage-gated sodium channel complex. SCN1A is indeed part of a monoatomic ion channel complex, but the more specific voltage-gated sodium channel complex annotation provides better functional specificity.
GO:0007628 adult walking behavior	IEA GO_REF:0000107	MARK AS OVER ANNOTATED	Summary: This annotation is based on Ensembl orthology inference from mouse models. While SCN1A mutations can affect motor behavior through seizures and neurological impairment, adult walking behavior is a high-level phenotype not directly representative of the core molecular function. This is likely over-annotation.
GO:0008340 determination of adult lifespan	IEA GO_REF:0000107	MARK AS OVER ANNOTATED	Summary: This annotation is based on Ensembl orthology inference from mouse models. While SCN1A mutations can be associated with sudden unexpected death in epilepsy (SUDEP), determination of adult lifespan is a high-level organismal phenotype not directly representative of the core sodium channel function. This represents over-annotation.
GO:0014704 intercalated disc	IEA GO_REF:0000107	REMOVE	Summary: This is a cardiac-specific cellular component annotation based on Ensembl orthology inference. While sodium channels may be present in cardiac tissue, SCN1A (Nav1.1) is predominantly neuronal, whereas SCN5A (Nav1.5) is the primary cardiac sodium channel. This annotation is likely inappropriate for SCN1A.
GO:0019227 neuronal action potential propagation	IEA GO_REF:0000107	ACCEPT	Summary: This annotation accurately captures a core biological process mediated by SCN1A. Nav1.1 channels are essential for neuronal action potential propagation, particularly in axon initial segments and nodes of Ranvier. This is well-supported by functional and localization data.
GO:0019228 neuronal action potential	IEA GO_REF:0000107	ACCEPT	Summary: This annotation correctly identifies SCN1A role in neuronal action potentials. As the pore-forming subunit of Nav1.1, SCN1A directly mediates the depolarizing phase of neuronal action potentials. This is a core neuronal function well-supported by evidence.
GO:0021675 nerve development	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: This annotation is based on Ensembl orthology inference. While SCN1A may play roles during nervous system development, this is a developmental process annotation that is peripheral to the core adult function as a voltage-gated sodium channel. Evidence for direct developmental roles is limited.
GO:0030018 Z disc	IEA GO_REF:0000107	REMOVE	Summary: This is a muscle-specific cellular component annotation based on Ensembl orthology inference. Z discs are structures in striated muscle. SCN1A (Nav1.1) is predominantly neuronal and this localization is not supported by evidence for the human protein.
GO:0030315 T-tubule	IEA GO_REF:0000107	REMOVE	Summary: This is a muscle-specific cellular component annotation based on Ensembl orthology inference. T-tubules are structures in muscle cells for excitation-contraction coupling. SCN1A (Nav1.1) is predominantly neuronal and this localization is inappropriate.
GO:0030424 axon	IEA GO_REF:0000107	ACCEPT	Summary: This annotation accurately reflects SCN1A localization. Nav1.1 channels are enriched in axons, particularly at axon initial segments and nodes of Ranvier where they are crucial for action potential initiation and propagation. This cellular component annotation is well-supported.
GO:0033268 node of Ranvier	IEA GO_REF:0000107	ACCEPT	Summary: This annotation accurately reflects a key subcellular localization of SCN1A. Nav1.1 channels are highly concentrated at nodes of Ranvier where they mediate saltatory conduction and action potential propagation along myelinated axons. This is a well-established localization.
GO:0034706 sodium channel complex	IEA GO_REF:0000107	ACCEPT	Summary: This annotation correctly identifies SCN1A as part of a sodium channel complex. As the pore-forming α-subunit, SCN1A associates with auxiliary β-subunits to form functional Nav1.1 sodium channel complexes. This cellular component annotation is accurate.
GO:0042391 regulation of membrane potential	IEA GO_REF:0000107	ACCEPT	Summary: This annotation accurately captures a key biological process mediated by SCN1A. Voltage-gated sodium channels are fundamental regulators of membrane potential in excitable cells, controlling the depolarization phase of action potentials and overall neuronal excitability.
GO:0043025 neuronal cell body	IEA GO_REF:0000107	ACCEPT	Summary: This annotation reflects SCN1A localization in neuronal cell bodies. While Nav1.1 channels are present in cell bodies, they are more highly concentrated and functionally important at axon initial segments and nodes of Ranvier. This represents a valid but less specific localization.
GO:0043194 axon initial segment	IEA GO_REF:0000107	ACCEPT	Summary: This annotation accurately reflects a critical subcellular localization of SCN1A. Nav1.1 channels are highly concentrated at axon initial segments where they are essential for action potential initiation. This is one of the most functionally important localizations for SCN1A.
GO:0050884 neuromuscular process controlling posture	IEA GO_REF:0000107	MARK AS OVER ANNOTATED	Summary: This annotation is based on Ensembl orthology inference from mouse models. While SCN1A mutations can indirectly affect posture through seizures and neurological impairment, this high-level behavioral annotation is not directly representative of the core sodium channel function.
GO:0050966 detection of mechanical stimulus involved in sensory perception of pain	IEA GO_REF:0000107	KEEP AS NON CORE	Summary: This annotation has some support from UniProt which states that Nav1.1 contributes to sensory perception of mechanically-induced pain through controlling excitability of somatosensory neurons. However, this is a specialized function compared to the core neuronal excitability role.
GO:0051649 establishment of localization in cell	IEA GO_REF:0000107	MARK AS OVER ANNOTATED	Summary: This is a very broad biological process annotation based on Ensembl orthology inference. While SCN1A protein must be localized to specific membrane compartments, this general localization process annotation provides minimal informative value about the core sodium channel function.
GO:0086010 membrane depolarization during action potential	IEA GO_REF:0000107	ACCEPT	Summary: This annotation accurately describes the core biological process mediated by SCN1A. Nav1.1 channels directly mediate membrane depolarization during the rising phase of action potentials through selective sodium influx. This is a fundamental function supported by extensive evidence.
GO:0005654 nucleoplasm	IDA GO_REF:0000052	REMOVE	Summary: This annotation is problematic. SCN1A encodes a multi-pass membrane protein that functions in the plasma membrane. Nuclear localization is inconsistent with its known function as a voltage-gated sodium channel. This IDA evidence may be from immunofluorescence artifacts or cross-reactivity.
GO:0005886 plasma membrane	IDA GO_REF:0000052	ACCEPT	Summary: This annotation is correct and supported by direct experimental evidence (IDA). SCN1A is a multi-pass membrane protein embedded in the plasma membrane where it functions as a voltage-gated sodium channel. This is the primary functional localization.
GO:0016604 nuclear body	IDA GO_REF:0000052	REMOVE	Summary: This annotation is inconsistent with SCN1A function. SCN1A encodes a voltage-gated sodium channel that functions in the plasma membrane, not in nuclear bodies. This IDA evidence may be from immunofluorescence artifacts or antibody cross-reactivity.
GO:0099508 voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential	NAS PMID:22150645 Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A)...	ACCEPT	Summary: This annotation describes a specific molecular function of SCN1A at presynaptic terminals. The referenced study (PMID:22150645) demonstrates SCN1A role in regulating presynaptic membrane potential. While this is a specialized function, it is well-supported by experimental evidence and represents an important aspect of Nav1.1 function. Supporting Evidence: PMID:22150645 2011 Dec 9. Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A) sodium channel truncating mutations.
GO:0099508 voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential	IDA PMID:22150645 Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A)...	ACCEPT	Summary: Duplicate annotation for the same GO term with stronger IDA evidence from PMID:22150645. This direct experimental evidence supports SCN1A role in regulating presynaptic membrane potential, which is important for neurotransmitter release and synaptic transmission. Supporting Evidence: PMID:22150645 2011 Dec 9. Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A) sodium channel truncating mutations.
GO:0099508 voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential	IMP PMID:22150645 Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A)...	ACCEPT	Summary: Third annotation for the same GO term with IMP evidence from PMID:22150645. This mutant phenotype evidence further supports the role of SCN1A in presynaptic membrane potential regulation. The study examined SCN1A truncation mutants and their effects on channel function. Supporting Evidence: PMID:22150645 We studied the effect of two DS truncated Na(V)1.1 mutants, R222* and R1234*, on coexpressed wild-type Na(+) channels
GO:0005248 voltage-gated sodium channel activity	IMP PMID:14672992 Epilepsy-associated dysfunction in the voltage-gated neurona...	ACCEPT	Summary: This annotation for the core molecular function has strong IMP (mutant phenotype) evidence from PMID:14672992. This represents high-quality experimental support for the voltage-gated sodium channel activity, complementing the IBA evidence for the same function. Supporting Evidence: PMID:14672992 Mutations in SCN1A, the gene encoding the brain voltage-gated sodium channel alpha1 subunit (NaV1.1), are associated with at least two forms of epilepsy
GO:0005886 plasma membrane	IDA PMID:14672992 Epilepsy-associated dysfunction in the voltage-gated neurona...	ACCEPT	Summary: This annotation has strong IDA evidence from PMID:14672992 for plasma membrane localization. This complements other annotations for the same cellular component and provides experimental support for the primary functional localization of SCN1A. Supporting Evidence: PMID:14672992 Voltage-gated sodium channels are responsible for the generation and propagation of action potentials in excitable tissues
GO:0086010 membrane depolarization during action potential	ISS GO_REF:0000024	ACCEPT	Summary: This annotation accurately describes the core biological process with ISS (sequence similarity) evidence. SCN1A mediates membrane depolarization during action potentials through selective sodium influx. This is a fundamental function well-conserved across species.
GO:0086010 membrane depolarization during action potential	IMP PMID:14672992 Epilepsy-associated dysfunction in the voltage-gated neurona...	ACCEPT	Summary: Duplicate annotation for the same core biological process with strong IMP evidence from PMID:14672992. This mutant phenotype evidence provides experimental support for SCN1A role in membrane depolarization during action potentials. Supporting Evidence: PMID:14672992 We examined the functional properties of four GEFS+ alleles and one SMEI allele using whole-cell patch-clamp analysis of heterologously expressed recombinant human SCN1A
GO:0086002 cardiac muscle cell action potential involved in contraction	IMP PMID:27207958 Variants of Transient Receptor Potential Melastatin Member 4...	KEEP AS NON CORE	Summary: While Nav1.1 may have some cardiac expression, this is peripheral to SCN1A's core neuronal function in GABAergic interneurons. Reason: SCN1A (Nav1.1) is predominantly neuronal while SCN5A (Nav1.5) is the main cardiac sodium channel. Any cardiac role for SCN1A is peripheral to its core function in neuronal action potentials. Supporting Evidence: PMID:27207958 Variants of Transient Receptor Potential Melastatin Member 4 in Childhood Atrioventricular Block.
GO:0005248 voltage-gated sodium channel activity	ISS GO_REF:0000024	ACCEPT	Summary: Another annotation for the core molecular function with ISS evidence based on sequence similarity. This provides additional computational support for the voltage-gated sodium channel activity, which is highly conserved across orthologs.
GO:0050966 detection of mechanical stimulus involved in sensory perception of pain	ISS GO_REF:0000024	KEEP AS NON CORE	Summary: Duplicate annotation for the same specialized function with ISS evidence. This provides additional computational support for SCN1A role in pain perception through controlling somatosensory neuron excitability, as mentioned in UniProt.
GO:0030018 Z disc	ISS GO_REF:0000024	REMOVE	Summary: Duplicate annotation for muscle-specific Z disc localization with ISS evidence. Like the previous annotation, this is inappropriate for SCN1A (Nav1.1) which is predominantly neuronal. Z discs are structures in striated muscle not relevant to Nav1.1 function.
GO:0005248 voltage-gated sodium channel activity	NAS PMID:10742094 Mutations of SCN1A, encoding a neuronal sodium channel, in t...	ACCEPT	Summary: Another annotation for the core molecular function with NAS evidence from PMID:10742094, a study about SCN1A mutations in GEFS+2. This provides additional literature support for the voltage-gated sodium channel activity of SCN1A. Supporting Evidence: PMID:10742094 Mutations of SCN1A, encoding a neuronal sodium channel, in two families with GEFS+2
GO:0006814 sodium ion transport	NAS PMID:10742094 Mutations of SCN1A, encoding a neuronal sodium channel, in t...	ACCEPT	Summary: This annotation for the core biological process has NAS evidence from PMID:10742094. This provides additional literature support for SCN1A role in sodium ion transport, which is fundamental to its voltage-gated sodium channel function. Supporting Evidence: PMID:10742094 Mutations of SCN1A, encoding a neuronal sodium channel, in two families with GEFS+2.

Core Functions

Mediating voltage-gated sodium channel activity as the pore-forming Nav1.1 α-subunit that enables neuronal action potential generation and propagation

Molecular Function:

voltage-gated sodium channel activity

Directly Involved In:

sodium ion transmembrane transport neuronal action potential membrane depolarization during action potential neuronal action potential propagation

Cellular Locations:

axon initial segment node of Ranvier plasma membrane

In Complex:

voltage-gated sodium channel complex

Supporting Evidence:

file:human/SCN1A/SCN1A-deep-research-falcon.md
Nav1.1 is a **voltage-gated Na+ channel** that opens with membrane depolarization to carry inward sodium current needed for action potential initiation/propagation.

Regulating presynaptic membrane potential through specialized voltage-gated ion channel activity that controls neurotransmitter release

Molecular Function:

voltage-gated monoatomic ion channel activity involved in regulation of presynaptic membrane potential

Directly Involved In:

regulation of membrane potential

Cellular Locations:

plasma membrane

Supporting Evidence:

file:human/SCN1A/SCN1A-deep-research-falcon.md
SCN1A/NaV1.1 sits directly in the **membrane excitability/action‑potential pathway**, contributing to the ionic currents that shape spike initiation and high-frequency firing, especially within inhibitory circuit elements that stabilize cortical/hippocampal network dynamics.

Controlling GABAergic interneuron excitability to maintain excitation-inhibition balance in neural circuits

Molecular Function:

voltage-gated sodium channel activity

Directly Involved In:

neuronal action potential regulation of membrane potential

Cellular Locations:

neuronal cell body axon

Supporting Evidence:

file:human/SCN1A/SCN1A-deep-research-falcon.md
The best-supported physiological role is enabling **high-frequency firing of inhibitory interneurons** and thereby maintaining **excitation-inhibition balance**.

References

file:human/SCN1A/SCN1A-deep-research-falcon.md

Falcon deep research report for SCN1A

Falcon corroborates SCN1A/Nav1.1 as the pore-forming voltage-gated sodium channel alpha subunit required for neuronal action potentials, with especially important function in GABAergic inhibitory interneurons.

"The UniProt accession **P35498** corresponds to **human SCN1A**, encoding the pore‑forming α subunit of the voltage‑gated sodium channel **NaV1.1**."
Falcon supports the core neuronal excitability interpretation and distinguishes loss-of-function disease mechanism from direct GO molecular function annotation.

"The best-supported physiological role is enabling **high-frequency firing of inhibitory interneurons** and thereby maintaining **excitation-inhibition balance**."

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms.

Provides computational annotations based on protein domain analysis

GO_REF:0000024

Manual transfer of experimentally-verified manual GO annotation data to orthologs by curator judgment of sequence similarity.

Transfers annotations based on sequence similarity to experimentally characterized orthologs

GO_REF:0000033

Annotation inferences using phylogenetic trees

High-confidence IBA annotations based on phylogenetic analysis of voltage-gated sodium channel family

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

GO_REF:0000052

Gene Ontology annotation based on curation of immunofluorescence data

Contains some questionable nuclear localizations that may represent artifacts or cross-reactivity

GO_REF:0000107

Automatic transfer of experimentally verified manual GO annotation data to orthologs using Ensembl Compara.

GO_REF:0000108

Automatic assignment of GO terms using logical inference, based on on inter-ontology links.

GO_REF:0000117

Electronic Gene Ontology annotations created by ARBA machine learning models

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods.

PMID:10742094

Mutations of SCN1A, encoding a neuronal sodium channel, in two families with GEFS+2.

PMID:14672992

Epilepsy-associated dysfunction in the voltage-gated neuronal sodium channel SCN1A.

Experimental evidence for SCN1A voltage-gated sodium channel activity using mutant phenotype analysis

"We examined the functional properties of four GEFS+ alleles and one SMEI allele using whole-cell patch-clamp analysis of heterologously expressed recombinant human SCN1A"
Demonstrates plasma membrane localization through direct experimental evidence

"Voltage-gated sodium channels are responsible for the generation and propagation of action potentials in excitable tissues"
Shows membrane depolarization function during action potentials in neuronal excitability

"Mutations in genes encoding sodium channel pore-forming α subunits and an accessory β 1 subunit have been associated with disorders of membrane excitability"
Establishes SCN1A as directly involved in action potential depolarization phase

"Our data provide evidence for a wide spectrum of sodium channel dysfunction in familial epilepsy and demonstrate that both GEFS+ and SMEI can be associated with nonfunctional SCN1A alleles"

PMID:22150645

Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A) sodium channel truncating mutations.

Demonstrates that SCN1A truncating mutations cause Dravet syndrome through haploinsufficiency mechanism

"About 50% of SCN1A DS mutations truncate Na(V)1.1, possibly causing complete loss of its function"
Confirms that mutant channels are not dominant negative, supporting pure loss-of-function pathogenesis

"Na(V)1.1 truncated mutants are not dominant negative, consistent with haploinsufficiency as the cause of DS"

PMID:27207958

Variants of Transient Receptor Potential Melastatin Member 4 in Childhood Atrioventricular Block.

Study about TRPM4 variants, not directly related to SCN1A function - annotation may be erroneous

"Transient receptor potential melastatin member 4 (TRPM4) is a nonselective cation channel. TRPM4 mutations have been linked to cardiac conduction disease and Brugada syndrome"

file:human/SCN1A/SCN1A-uniprot.txt

SCN1A UniProt functional annotation

Confirms 24-transmembrane domain architecture of Nav1.1 α-subunit

"TRANSMEM 129..146 ... TRANSMEM 153..177 ... TRANSMEM 189..205 ... TRANSMEM 214..235 ... TRANSMEM 246..269 ... TRANSMEM 398..423 ... TRANSMEM 769..787 ... TRANSMEM 798..820 ... TRANSMEM 831..849 ... TRANSMEM 855..874 ... TRANSMEM 892..912 ... TRANSMEM 966..992 ... TRANSMEM 1219..1237 ... TRANSMEM 1251..1276 ... TRANSMEM 1279..1304 ... TRANSMEM 1314..1332 ... TRANSMEM 1346..1369 ... TRANSMEM 1458..1483 ... TRANSMEM 1542..1560 ... TRANSMEM 1572..1593 ... TRANSMEM 1602..1623 ... TRANSMEM 1637..1655 ... TRANSMEM 1666..1688 ... TRANSMEM 1760..1788"
Documents catalytic activity: Na+(in) = Na+(out) representing selective sodium transport

"CATALYTIC ACTIVITY: Reaction=Na(+)(in) = Na(+)(out)"
Establishes role in action potential depolarization phase

"Pore-forming subunit of Nav1.1, a voltage-gated sodium (Nav) channel that directly mediates the depolarizing phase of action potentials in excitable membranes"
Notes contribution to sensory perception of mechanically-induced pain

"Nav1.1 plays a role in controlling the excitability and action potential propagation from somatosensory neurons, thereby contributing to the sensory perception of mechanically-induced pain"
Confirms plasma membrane localization and voltage-gated channel complex formation

"SUBCELLULAR LOCATION: Cell membrane ... Multi-pass membrane protein"

clinical_literature

SCN1A clinical significance in epilepsy genetics

SCN1A is the most frequently mutated gene in genetic epilepsies
Mutations found in >80% of Dravet syndrome cases representing the major genetic cause
Phenotypic spectrum ranges from febrile seizures (GEFS+) to severe developmental epileptic encephalopathy
Loss-of-function mutations preferentially affect GABAergic interneurons leading to network disinhibition
Sodium channel blockers are contraindicated as they worsen seizures by further impairing interneuron function
Associated with sudden unexpected death in epilepsy (SUDEP) in severe cases

Suggested Experiments

Experiment: Patch-clamp electrophysiology of SCN1A variants in different neuronal subtypes to correlate biophysical properties with clinical phenotypes

Experiment: Organoid models of human brain development using patient-derived iPSCs to study SCN1A function in cortical circuit formation

Experiment: Two-photon calcium imaging in brain slices to study how SCN1A mutations affect inhibitory circuit function and excitability

Experiment: Cryo-EM structural analysis of SCN1A in different conformational states to understand mutation effects on channel structure

Deep Research

Falcon

(SCN1A-deep-research-falcon.md)

this with annotations you find in gene/protein databases, but these can be outdated or inaccurate. Falcon Edison Scientific Literature 37 citations 2026-05-11T00:30:48.057099

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Comprehensive research report: Human SCN1A / NaV1.1 (UniProt P35498) — functional annotation, recent research (2023–2024), and real‑world applications

Executive summary (verified target)

The UniProt accession P35498 corresponds to human SCN1A, encoding the pore‑forming α subunit of the voltage‑gated sodium channel NaV1.1. Multiple recent reviews and primary studies converge on a core functional model in which NaV1.1 is especially important for action potential firing in GABAergic inhibitory interneurons (notably parvalbumin‑positive fast‑spiking interneurons). Loss‑of‑function (LoF)/haploinsufficiency reduces inhibitory output and disrupts excitation–inhibition balance, producing epileptic phenotypes such as Dravet syndrome, whereas gain‑of‑function (GoF) variants can cause distinct early‑onset encephalopathies or migraine phenotypes with different pharmacologic implications. (fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 4-6, clatot2023scn1again‐of‐functionmutation pages 1-3, mouhi2024thegeneticfacets pages 1-2)

Evidence map (structured summary)

Category	Summary for SCN1A / Nav1.1 (UniProt P35498)	Key source	Publication date	URL	Citation
Verified identity	SCN1A encodes voltage-gated sodium channel alpha subunit Nav1.1 in Homo sapiens; a pore-forming VGSC/Nav alpha subunit of the sodium channel family, highly relevant in the CNS and especially inhibitory interneurons. This matches UniProt P35498 naming and family assignment.	Fan et al., Int J Mol Sci; Barbieri et al., Life	Dec 2023; May 2023	https://doi.org/10.3390/ijms25010031 ; https://doi.org/10.3390/life13051191	(fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 2-4)
Molecular function	Nav1.1 is a voltage-gated Na+ channel that opens with membrane depolarization to carry inward sodium current needed for action potential initiation/propagation. Canonical structure: 4 homologous domains (DI–DIV), each with S1–S6; S4 segments are voltage sensors, S5–S6 form the pore/selectivity pathway, and the DIII–DIV intracellular loop mediates fast inactivation. Functional dysfunction can be LOF (reduced current density/recovery) or GOF (persistent current, altered gating).	Fan et al., Int J Mol Sci; Barbieri et al., Life	Dec 2023; May 2023	https://doi.org/10.3390/ijms25010031 ; https://doi.org/10.3390/life13051191	(fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 2-4)
Cellular localization	Nav1.1 is a plasma-membrane channel concentrated in the central nervous system, with strong functional importance in GABAergic inhibitory interneurons, including parvalbumin-positive fast-spiking interneurons.	Fan et al., Int J Mol Sci; Yuan et al., Brain	Dec 2023; Oct 2024	https://doi.org/10.3390/ijms25010031 ; https://doi.org/10.1093/brain/awad349	(fan2023clinicalandgenetic pages 13-15, yuan2024asorestoresexcitability pages 1-2)
Core physiological role	The best-supported physiological role is enabling high-frequency firing of inhibitory interneurons and thereby maintaining excitation–inhibition balance. In SCN1A haploinsufficiency, PV+ interneurons show reduced sodium current density, abnormal firing with depolarization block, and reduced GABAergic signaling onto pyramidal neurons; this disinhibits cortical networks and promotes seizures.	Yuan et al., Brain; Barbieri et al., Life	Oct 2024; May 2023	https://doi.org/10.1093/brain/awad349 ; https://doi.org/10.3390/life13051191	(yuan2024asorestoresexcitability pages 1-2, barbieri2023voltagegatedsodiumchannel pages 4-6, yuan2024asorestoresexcitability media 56316bcb)
Dravet syndrome	Major disease association: Dravet syndrome (DS) is usually caused by heterozygous LOF / haploinsufficiency of SCN1A. Reported estimates in recent reviews: ~85–90% of DS is attributable to SCN1A variants; incidence about 1/22,000–1/49,900 live births. Mechanistically, reduced Nav1.1 function in inhibitory interneurons lowers inhibition and causes developmental and epileptic encephalopathy.	Mouhi et al., Ann Child Neurol; Fan et al., Int J Mol Sci; 2024 review/prize summary	Apr 2024; Dec 2023; 2024	https://doi.org/10.26815/acn.2023.00367 ; https://doi.org/10.3390/ijms25010031	(mouhi2024thegeneticfacets pages 1-2, fan2023clinicalandgenetic pages 13-15, reallife2024themackeithprize pages 7-8)
GEFS+	Generalized epilepsy with febrile seizures plus (GEFS+) is a milder SCN1A-associated epilepsy spectrum than DS; SCN1A variants linked to GEFS+ are often less disruptive than DS truncating/haploinsufficient variants, though reduced interneuron excitability remains a key mechanism in many cases.	Barbieri et al., Life	May 2023	https://doi.org/10.3390/life13051191	(barbieri2023voltagegatedsodiumchannel pages 4-6)
Hemiplegic migraine	Familial hemiplegic migraine type 3 (FHM3) is associated with SCN1A GOF variants. Reported mechanisms include right-shifted inactivation, faster recovery, and increased persistent current, producing interneuron hyperactivity and increased susceptibility to cortical spreading depression rather than classic Dravet-like haploinsufficiency.	Barbieri et al., Life	May 2023	https://doi.org/10.3390/life13051191	(barbieri2023voltagegatedsodiumchannel pages 4-6, barbieri2023voltagegatedsodiumchannel pages 14-15)
Early-onset DEE GOF example	A recurrent SCN1A p.R1636Q variant defines a distinct early-onset developmental and epileptic encephalopathy with mixed GOF, including slowed inactivation and prominent late sodium current. Unlike LOF/Dravet, a sodium-channel blocker (oxcarbazepine) partially corrected electrophysiologic abnormalities and helped one patient clinically.	Clatot et al., Epilepsia	Nov 2023	https://doi.org/10.1111/epi.17444	(clatot2023scn1again‐of‐functionmutation pages 1-3)
Established treatment implications	In LOF/Dravet, sodium-channel blockers can worsen seizures and are generally avoided; therapies that enhance inhibitory tone are preferred. Recent reviews identify fenfluramine as established in clinical practice, alongside stiripentol, cannabidiol, valproate, and clobazam for many patients.	Specchio et al., Lancet Child Adolesc Health; Mouhi et al., Ann Child Neurol; Clatot et al., Epilepsia	Nov 2024; Apr 2024; Nov 2023	https://doi.org/10.1016/S2352-4642(24)00196-2 ; https://doi.org/10.26815/acn.2023.00367 ; https://doi.org/10.1111/epi.17444	(specchio2024theexpandingfield pages 27-29, mouhi2024thegeneticfacets pages 1-2, clatot2023scn1again‐of‐functionmutation pages 1-3)
Fenfluramine: current implementation	Fenfluramine is now used in real-world DS practice and is recommended as an early-line option in recent guidance. Real-world Polish data reported >70% seizure reduction in one detailed case, normalization of EEG, and developmental/ataxia improvement; the same cohort described significant clinical improvement in 3/3 patients started on fenfluramine in 2023–2024.	Wirrell et al., Epilepsia Open; Zielińska et al., Biomedicines	Jul 2024; Jun 2024	https://doi.org/10.1002/epi4.12998 ; https://doi.org/10.3390/biomedicines12061249	(zielinska2024howhasthe pages 2-4)
Emerging disease-modifying therapy: ASO	STK-001 / ASO-22 is an antisense strategy designed to increase productive SCN1A transcript by preventing inclusion of poison exon 20N from the healthy allele (TANGO approach). In mouse models, related ASO treatment restored PV+ interneuron firing, sodium current density, and GABAergic signaling, and prior work reduced electrographic seizures and SUDEP. Ongoing clinical programs include MONARCH (NCT04442295) and ADMIRAL.	Yuan et al., Brain; 2024 ASO/clinical summary	Oct 2024; 2024	https://doi.org/10.1093/brain/awad349	(yuan2024asorestoresexcitability pages 1-2, reallife2024themackeithprize pages 7-8, yuan2024asorestoresexcitability media 56316bcb)
Emerging gene therapy / CRISPRa	2024 expert reviews highlight viral-vector Nav1.1 replacement, dCas9-based SCN1A activation, and cell-selective AAV-mediated SCN1A regulation as promising disease-modifying concepts. Preclinical studies cited in review literature show rescue of interneuron excitability, seizure phenotypes, and mortality in Dravet models, with some tolerability signals in nonhuman primates.	Specchio et al., Lancet Child Adolesc Health	Nov 2024	https://doi.org/10.1016/S2352-4642(24)00196-2	(specchio2024theexpandingfield pages 27-29)
Long-term outcomes and burden	In a 10-year prospective SCN1A-positive DS cohort (68/113 caregivers responded), developmental status worsened from mean 2.9 to 4.45 severity rating (P < 0.001) even as epilepsy severity modestly improved. Comorbidities increased: autistic features 30%→77%, behavioral problems 38%→81%, motor/mobility problems 41%→80%. >90% of caregivers reported negative impacts on their own health/career, and 35% had never discussed SUDEP with a clinician.	Feng et al., Brain Communications	Jan 2024	https://doi.org/10.1093/braincomms/fcae004	(feng2024longtermpredictorsof pages 1-3)
Additional quantitative disease statistics	Recent sources report SUDEP risk up to 20% in Dravet syndrome and a US prevalence estimate as high as 1:15,700 (~20,000 individuals). In one retrospective cohort of 138 Chinese children with SCN1A mutations, 77% had first seizure before 7 months, 72% had febrile convulsions lasting >15 min, 67% had multiple febrile seizures within 24 h, and fever accompanied 80% of events.	Yuan et al., Brain; Mouhi et al., Ann Child Neurol	Oct 2024; Apr 2024	https://doi.org/10.1093/brain/awad349 ; https://doi.org/10.26815/acn.2023.00367	(yuan2024asorestoresexcitability pages 1-2, mouhi2024thegeneticfacets pages 1-2)

Table: This table summarizes verified identity, function, localization, disease mechanisms, and translational relevance for human SCN1A/Nav1.1 using recent authoritative sources. It is useful as a compact evidence map linking molecular function to clinical phenotypes and emerging therapies.

1) Key concepts and definitions (current understanding)

1.1 What SCN1A encodes

SCN1A encodes NaV1.1, a voltage‑gated Na+ channel α subunit that forms the ion‑conducting pore and contains the canonical sodium‑channel architecture: four homologous domains (DI–DIV) with S1–S6 transmembrane helices per domain; S4 helices act as primary voltage sensors, and the DIII–DIV intracellular loop is central to fast inactivation. (fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 2-4)

1.2 Functional definition (substrate specificity)

NaV1.1 is an electrogenic ion channel whose key “substrate” is Na+, conducting inward sodium current upon depolarization to enable action potential initiation/propagation and support high‑frequency firing in specific neuronal populations. (fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 2-4)

1.3 Loss‑of‑function vs gain‑of‑function in sodium channels

Recent reviews explicitly distinguish:
- LoF: decreased current density, impaired recovery, reduced availability, or other changes reducing excitability. (barbieri2023voltagegatedsodiumchannel pages 2-4)
- GoF: shifts in activation/inactivation and/or increased persistent/late currents producing hyperexcitability. (barbieri2023voltagegatedsodiumchannel pages 2-4, clatot2023scn1again‐of‐functionmutation pages 1-3)

For SCN1A, the clinical impact of LoF versus GoF is not symmetric: LoF classically drives Dravet‑spectrum disease, whereas GoF is increasingly recognized as a mechanistically distinct cause of developmental epileptic encephalopathy in some cases and may require different antiseizure pharmacology. (clatot2023scn1again‐of‐functionmutation pages 1-3, fan2023clinicalandgenetic pages 13-15)

2) Functional annotation: biological processes, pathways, and localization

2.1 Cellular and tissue localization

NaV1.1 is described as predominantly CNS‑expressed with functional enrichment in inhibitory GABAergic interneurons, including parvalbumin‑positive (PV+) fast‑spiking interneurons. (fan2023clinicalandgenetic pages 13-15, yuan2024asorestoresexcitability pages 1-2)

2.2 Primary physiological role: interneuron excitability and excitation–inhibition balance

A key mechanistic model (supported by 2024 primary electrophysiology in a Dravet mouse model) is:
- In Scn1a+/− mice, cortical pyramidal neuron intrinsic excitability is largely unchanged, but PV+ interneurons show altered excitability with decreased sodium current density and a progression to hypoexcitability/depolarization block at higher drive. (yuan2024asorestoresexcitability pages 1-2)
- Reduced PV+ function corresponds to reduced GABAergic signaling onto pyramidal neurons, consistent with impaired inhibitory tone as a proximal driver of network hyperexcitability. (yuan2024asorestoresexcitability pages 1-2)

These findings align with earlier/ongoing synthesis that Dravet syndrome is an “interneuronopathy” caused by impaired Nav1.1‑dependent firing and synaptic inhibition, generating seizures and downstream neurodevelopmental impairment. (barbieri2023voltagegatedsodiumchannel pages 4-6, barbieri2023voltagegatedsodiumchannel pages 14-15)

2.3 Pathway context

SCN1A/NaV1.1 sits directly in the membrane excitability/action‑potential pathway, contributing to the ionic currents that shape spike initiation and high‑frequency firing, especially within inhibitory circuit elements that stabilize cortical/hippocampal network dynamics. (barbieri2023voltagegatedsodiumchannel pages 2-4, fan2023clinicalandgenetic pages 13-15)

3) Disease associations and genotype–phenotype relationships (with recent statistics)

3.1 Dravet syndrome (SCN1A LoF / haploinsufficiency)

Dravet syndrome (DS) is a developmental and epileptic encephalopathy with seizures beginning in the first year of life; recent reviews estimate DS incidence around 1/22,000 to 1/49,900 live births, and attribute ~90% of DS to SCN1A variants (usually de novo). (mouhi2024thegeneticfacets pages 1-2)

Multiple sources describe DS as primarily an SCN1A LoF/haploinsufficiency disorder in which impaired inhibitory interneuron firing reduces inhibition and produces network hyperexcitability. (fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 4-6)

Additional DS quantitative burden includes SUDEP risk up to ~20% and prevalence estimates as high as 1:15,700 in the US in a recent mechanistic/therapeutic study focused on SCN1A augmentation. (yuan2024asorestoresexcitability pages 1-2)

3.2 Long‑term outcomes in SCN1A‑positive Dravet (10‑year prospective data)

A 10‑year prospective follow‑up of an SCN1A‑positive DS cohort (UK; 68/113 caregiver respondents) reported that developmental outcome worsened substantially over a decade even as epilepsy severity modestly improved. Comorbidities increased markedly: autistic features 30%→77%, behavioral problems 38%→81%, and motor/mobility problems 41%→80% (all P<0.001). (feng2024longtermpredictorsof pages 1-3)

3.3 GEFS+ (SCN1A variants; often milder)

Reviews summarize that GEFS+ is associated with ~50 SCN1A mutations and is generally milder and more drug responsive than DS, though reduced interneuron excitability remains a recurring mechanistic theme. (barbieri2023voltagegatedsodiumchannel pages 4-6)

3.4 Hemiplegic migraine type 3 (SCN1A GoF)

Familial hemiplegic migraine type 3 (FHM3) is described as caused by SCN1A variants with GoF biophysical signatures (e.g., increased persistent current; altered inactivation), and animal models show altered interneuron activity with lowered threshold for cortical spreading depression—distinct from DS LoF pathophysiology. (barbieri2023voltagegatedsodiumchannel pages 4-6)

3.5 Early‑onset DEE due to SCN1A GoF: p.R1636Q exemplar

A 2023 Epilepsia study characterized a recurrent SCN1A p.R1636Q variant causing early‑onset DEE and demonstrated a mixed GoF pattern with slowed inactivation and prominent late sodium current; importantly, oxcarbazepine partially corrected electrophysiologic abnormalities and was clinically beneficial in one individual—contrasting with the typical contraindication of sodium‑channel blockers in SCN1A LoF/DS. (clatot2023scn1again‐of‐functionmutation pages 1-3)

4) Recent developments and latest research (prioritizing 2023–2024)

4.1 Disease‑modifying concept: restoring SCN1A output (ASO / “poison exon” strategy)

A 2024 primary study in Brain investigated an antisense oligonucleotide (ASO) strategy (surrogate ASO‑84 for STK‑001/ASO‑22) targeting SCN1A poison exon 20N inclusion, designed to increase productive transcript and NaV1.1 expression. In Scn1a+/− mice, a single early intracerebroventricular dose restored PV+ interneuron firing, restored sodium current density, and normalized GABAergic signaling to pyramidal neurons, supporting a mechanism‑aligned precision therapy strategy for haploinsufficiency. (yuan2024asorestoresexcitability pages 1-2)

Figures retrieved from this study provide quantitative visual support for (i) interneuron firing rescue, (ii) restored inhibitory synaptic signaling, and (iii) restored sodium current density. (yuan2024asorestoresexcitability media 56316bcb, yuan2024asorestoresexcitability media ce549bc3, yuan2024asorestoresexcitability media fe492d0d, yuan2024asorestoresexcitability media ab75e01c)

4.2 Gene therapy / gene regulation approaches (AAV, dCas9 activation)

A 2024 Lancet Child & Adolescent Health review summarizes translational directions for genetic DEEs, including SCN1A LoF disorders, and highlights preclinical evidence for viral vector–mediated NaV1.1 expression and dCas9‑based SCN1A activation restoring interneuron excitability and attenuating seizures in Dravet models, with additional emphasis on cell‑selective AAV regulation and tolerability signals in nonhuman primates. (specchio2024theexpandingfield pages 27-29)

5) Current applications and real‑world implementations

5.1 Precision diagnosis and medication selection

Recent reviews emphasize actionable treatment stratification based on SCN1A mechanism: for LoF/Dravet, avoid sodium‑channel blockers (which may worsen seizures), whereas certain GoF SCN1A encephalopathies may respond to sodium‑channel inhibitors. (fan2023clinicalandgenetic pages 13-15, clatot2023scn1again‐of‐functionmutation pages 1-3)

5.2 Fenfluramine (FINTEPLA) in clinical practice (2024 guidance)

A 2024 clinical practice review (Epilepsia Open, July 2024) states fenfluramine is approved for seizures associated with DS/LGS in patients ≥2 years in the US and as add‑on in EU/UK/Japan and describes serotonergic and sigma‑1 receptor activity. It summarizes comparative efficacy evidence from a network meta‑analysis ranking probability of ≥50% seizure reduction as fenfluramine > stiripentol > cannabidiol (ES 0.715 vs 0.604 vs 0.448, respectively) and provides practical dosing guidance (e.g., start 0.2 mg/kg/day; commonly ~0.4 mg/kg/day; capped daily doses depend on stiripentol co‑therapy). (wirrell2024practicalconsiderationsfor pages 2-4, wirrell2024practicalconsiderationsfor pages 8-9)

5.3 Real‑world fenfluramine outcomes (2023–2024 implementation example)

A 2024 Polish single‑center retrospective report described real‑world introduction of fenfluramine (available in Poland since 2023 via emergency access) in three DS patients, with one detailed case reporting >70% seizure reduction, EEG normalization, and developmental/ataxia improvements after fenfluramine initiation in 2024. (zielinska2024howhasthe pages 2-4)

5.4 Neuromodulation: Vagus nerve stimulation (VNS) in Dravet syndrome

A 2024 systematic review/meta‑analysis (Frontiers in Neurology, July 2024) pooled 16 trials (n=173) and estimated a ≥50% seizure reduction responder rate of 0.54 (95% CI 0.43–0.65), with timepoint responder rates of 0.42 at 3 months, 0.54 at 6 months, 0.51 at 12 months, and 0.49 at 24 months. The authors note VNS appears beneficial for children with SCN1A abnormalities but emphasize low‑quality evidence and the need for RCTs. (chen2024vagusnervestimulation pages 1-2, chen2024vagusnervestimulation pages 6-9)

6) Expert opinions and analysis (authoritative sources)

6.1 Convergent expert consensus on DS mechanism and treatment caveats

Multiple recent authoritative reviews (2023–2024) converge that SCN1A LoF reduces firing in inhibitory interneurons and that sodium‑channel blockers should be avoided in classic Dravet syndrome, reinforcing a mechanism‑guided clinical heuristic. (specchio2024theexpandingfield pages 27-29, fan2023clinicalandgenetic pages 13-15, barbieri2023voltagegatedsodiumchannel pages 4-6)

6.2 Emerging consensus on mechanism‑aligned precision therapies

Authoritative synthesis in 2024 places SCN1A among leading examples where genetic clarity enables precision modalities: ASOs to augment transcript output and AAV/dCas9 approaches to increase NaV1.1 expression in relevant neuronal populations. (specchio2024theexpandingfield pages 27-29, yuan2024asorestoresexcitability pages 1-2)

7) Variant interpretation and functional annotation in clinical genomics (2024)

A 2024 preprint proposes a Bayesian ACMG/AMP‑calibrated framework to translate heterogeneous electrophysiology outcomes into standardized evidence for variant pathogenicity. In their dataset, the authors analyzed 216 functional assessments across 191 variants, including SCN1A (n=74). They report which electrophysiology parameters most often drive GoF/LoF classification and define conditions for Strong evidence as likelihood ratio >18.7 under ACMG/AMP. They further introduce FENICS, a 152‑term ontology, and report that ClinVar contains 1,731 standardized annotations across a 271‑variant combined set (SCN1A/2A/3A/8A and KCNQ2). (parthasarathy2024optimizingclinicalinterpretability pages 1-3)

Notes on scope and limitations

This report focuses on human SCN1A / NaV1.1 (UniProt P35498) and does not generalize findings from other sodium channel genes except where used as comparative framework in cited sources.
Some clinical‑trial details for STK‑001 were only available in a non‑journal “prize” write‑up excerpt; key mechanistic support for the poison‑exon ASO strategy is instead supported by peer‑reviewed primary evidence in Brain (2024). (reallife2024themackeithprize pages 7-8, yuan2024asorestoresexcitability pages 1-2)

Key 2023–2024 sources cited (with dates and URLs)

Fan et al. International Journal of Molecular Sciences (Dec 2023) https://doi.org/10.3390/ijms25010031 (fan2023clinicalandgenetic pages 13-15)
Clatot et al. Epilepsia (Nov 2023) https://doi.org/10.1111/epi.17444 (clatot2023scn1again‐of‐functionmutation pages 1-3)
Mouhi et al. Annals of Child Neurology (Apr 2024) https://doi.org/10.26815/acn.2023.00367 (mouhi2024thegeneticfacets pages 1-2)
Feng et al. Brain Communications (Jan 2024) https://doi.org/10.1093/braincomms/fcae004 (feng2024longtermpredictorsof pages 1-3)
Wirrell et al. Epilepsia Open (Jul 2024) https://doi.org/10.1002/epi4.12998 (wirrell2024practicalconsiderationsfor pages 2-4)
Chen et al. Frontiers in Neurology (Jul 2024) https://doi.org/10.3389/fneur.2024.1402989 (chen2024vagusnervestimulation pages 1-2)
Yuan et al. Brain (Oct 2024) https://doi.org/10.1093/brain/awad349 (yuan2024asorestoresexcitability pages 1-2)
Specchio et al. The Lancet Child & Adolescent Health (Nov 2024) https://doi.org/10.1016/S2352-4642(24)00196-2 (specchio2024theexpandingfield pages 27-29)
Zielińska et al. Biomedicines (Jun 2024) https://doi.org/10.3390/biomedicines12061249 (zielinska2024howhasthe pages 2-4)
Parthasarathy et al. bioRxiv (May 2024) https://doi.org/10.1101/2024.05.09.593343 (parthasarathy2024optimizingclinicalinterpretability pages 1-3)

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(chen2024vagusnervestimulation pages 1-2): Shuang Chen, Man Li, and Ming Huang. Vagus nerve stimulation for the therapy of dravet syndrome: a systematic review and meta-analysis. Frontiers in Neurology, Jul 2024. URL: https://doi.org/10.3389/fneur.2024.1402989, doi:10.3389/fneur.2024.1402989. This article has 8 citations and is from a peer-reviewed journal.
(chen2024vagusnervestimulation pages 6-9): Shuang Chen, Man Li, and Ming Huang. Vagus nerve stimulation for the therapy of dravet syndrome: a systematic review and meta-analysis. Frontiers in Neurology, Jul 2024. URL: https://doi.org/10.3389/fneur.2024.1402989, doi:10.3389/fneur.2024.1402989. This article has 8 citations and is from a peer-reviewed journal.
(parthasarathy2024optimizingclinicalinterpretability pages 1-3): Shridhar Parthasarathy, Stacey R. Cohen, Eryn Fitch, Priya Vaidiswaran, Sarah Ruggiero, Laina Lusk, Victoria Chisari, David Lewis-Smith, Stephan Lauxmann, Christian M. Boßelmann, Christopher H. Thompson, Eric R. Wengert, Ulrike Hedrich, Shiva Ganesan, Ganna Balagura, Roland Krause, Julie Xian, Peter Galer, Manuela Pendziwiat, Eduardo Perez-Palma, Mauno Vihinen, Jennifer Hart, Melissa J. Landrum, Dennis Lal, Edward C. Cooper, Holger Lerche, Ethan Goldberg, Andreas Brunklaus, Carlos G. Vanoye, Stephanie Schorge, Alfred L. George, and Ingo Helbig. Optimizing clinical interpretability of functional evidence in epilepsy-related ion channel variants. bioRxiv, May 2024. URL: https://doi.org/10.1101/2024.05.09.593343, doi:10.1101/2024.05.09.593343. This article has 2 citations.

Citations

barbieri2023voltagegatedsodiumchannel pages 4-6
zielinska2024howhasthe pages 2-4
specchio2024theexpandingfield pages 27-29
feng2024longtermpredictorsof pages 1-3
barbieri2023voltagegatedsodiumchannel pages 2-4
yuan2024asorestoresexcitability pages 1-2
mouhi2024thegeneticfacets pages 1-2
parthasarathy2024optimizingclinicalinterpretability pages 1-3
fan2023clinicalandgenetic pages 13-15
wirrell2024practicalconsiderationsfor pages 2-4
chen2024vagusnervestimulation pages 1-2
reallife2024themackeithprize pages 7-8
barbieri2023voltagegatedsodiumchannel pages 14-15
wirrell2024practicalconsiderationsfor pages 8-9
chen2024vagusnervestimulation pages 6-9
https://doi.org/10.3390/ijms25010031
https://doi.org/10.3390/life13051191
https://doi.org/10.1093/brain/awad349
https://doi.org/10.26815/acn.2023.00367
https://doi.org/10.1111/epi.17444
https://doi.org/10.1016/S2352-4642(24
https://doi.org/10.1002/epi4.12998
https://doi.org/10.3390/biomedicines12061249
https://doi.org/10.1093/braincomms/fcae004
https://doi.org/10.3389/fneur.2024.1402989
https://doi.org/10.1101/2024.05.09.593343
https://doi.org/10.3390/ijms25010031,
https://doi.org/10.3390/life13051191,
https://doi.org/10.1111/epi.17444,
https://doi.org/10.26815/acn.2023.00367,
https://doi.org/10.1093/brain/awad349,
https://doi.org/10.1016/s2352-4642(24
https://doi.org/10.3390/biomedicines12061249,
https://doi.org/10.1093/braincomms/fcae004,
https://doi.org/10.1002/epi4.12998,
https://doi.org/10.3389/fneur.2024.1402989,
https://doi.org/10.1101/2024.05.09.593343,

📄 View Raw YAML

---
id: P35498
gene_symbol: SCN1A
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: SCN1A encodes the pore-forming α-subunit of Nav1.1, the most clinically
  important voltage-gated sodium channel in epilepsy genetics. As a 24-transmembrane
  domain protein, SCN1A directly mediates the depolarizing phase of action potentials
  through voltage-dependent conformational switching that allows selective Na+ influx
  along electrochemical gradients. Nav1.1 is particularly critical in GABAergic interneurons
  where it regulates inhibitory neuron excitability - loss-of-function mutations impair
  interneuron function leading to network hyperexcitability and seizures. SCN1A mutations
  cause >80% of Dravet syndrome cases and represent the most frequent target of epilepsy-related
  mutations, causing a phenotypic spectrum from febrile seizures (GEFS+) to severe
  developmental epileptic encephalopathy. The protein localizes to specialized membrane
  domains including axon initial segments, nodes of Ranvier, and neuronal cell bodies
  where it enables action potential initiation, propagation, and presynaptic membrane
  potential regulation. Understanding SCN1A pathophysiology has revealed that sodium
  channel blockers are contraindicated in SCN1A-related epilepsies as they worsen
  seizures by further impairing already compromised interneuron excitability.
existing_annotations:
  - term:
      id: GO:0001518
      label: voltage-gated sodium channel complex
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: This annotation correctly identifies SCN1A as part of the voltage-gated
        sodium channel complex. As the pore-forming α-subunit, SCN1A associates with
        auxiliary β-subunits (SCN1B, SCN2B, SCN3B, SCN4B) to form the functional Nav1.1
        complex. IBA evidence from phylogenetic analysis provides strong support for
        this cellular component annotation.
      action: ACCEPT
  - term:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: This is the core molecular function of SCN1A. The protein directly
        mediates voltage-gated sodium channel activity through conformational changes
        that allow selective Na+ passage. This annotation captures the essential enzymatic
        function supported by UniProt catalytic activity data (Na+(in) = Na+(out))
        and extensive experimental evidence.
      action: ACCEPT
      supported_by:
        - reference_id: file:human/SCN1A/SCN1A-deep-research-falcon.md
          supporting_text: Nav1.1 is a **voltage-gated Na+ channel** that opens
            with membrane depolarization to carry inward sodium current needed for
            action potential initiation/propagation.
  - term:
      id: GO:0035725
      label: sodium ion transmembrane transport
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: This accurately describes the biological process mediated by SCN1A.
        The protein enables sodium ion transport across neuronal membranes, which
        is fundamental for action potential generation and propagation. IBA evidence
        from phylogenetic analysis strongly supports this core function.
      action: ACCEPT
  - term:
      id: GO:0086002
      label: cardiac muscle cell action potential involved in contraction
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: While Nav1.1 sodium channels may be expressed in cardiac tissue, SCN1A
        is predominantly and specifically important in neuronal tissues, particularly
        GABAergic interneurons. Cardiac action potentials are primarily mediated by
        SCN5A (Nav1.5). This annotation represents over-annotation for SCN1A, which
        should be marked as peripheral to its core neuronal function.
      action: KEEP_AS_NON_CORE
  - term:
      id: GO:0099505
      label: regulation of presynaptic membrane potential
    evidence_type: IEA
    original_reference_id: GO_REF:0000108
    review:
      summary: This annotation is consistent with SCN1A role in presynaptic terminals
        where voltage-gated sodium channels regulate membrane potential and neurotransmitter
        release. However, IEA evidence alone is relatively weak, and this represents
        a more specific function than the core sodium channel activity.
      action: KEEP_AS_NON_CORE
  - term:
      id: GO:0001518
      label: voltage-gated sodium channel complex
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: Duplicate of earlier IBA annotation for the same GO term. This IEA
        annotation provides additional computational support for SCN1A being part
        of voltage-gated sodium channel complex, consistent with its role as the pore-forming
        α-subunit.
      action: ACCEPT
  - term:
      id: GO:0005216
      label: monoatomic ion channel activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: This is a broader molecular function term that encompasses sodium channel
        activity. While accurate, it is less informative than the specific voltage-gated
        sodium channel activity annotation. This represents a valid but general annotation.
      action: ACCEPT
  - term:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Another annotation for the core molecular function of SCN1A with IEA
        evidence. This duplicates the IBA annotation but provides additional computational
        support for the essential voltage-gated sodium channel activity.
      action: ACCEPT
  - term:
      id: GO:0005261
      label: monoatomic cation channel activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: This is a broader molecular function term that encompasses sodium channel
        activity. Sodium channels are indeed monoatomic cation channels, but this
        annotation is less specific than voltage-gated sodium channel activity. Still
        accurate but general.
      action: ACCEPT
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: Correct cellular component annotation. SCN1A is a multi-pass membrane
        protein embedded in the plasma membrane where it functions as a voltage-gated
        sodium channel. UniProt confirms this subcellular localization.
      action: ACCEPT
  - term:
      id: GO:0006811
      label: monoatomic ion transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: This is a broad biological process term that encompasses sodium ion
        transport. While accurate (sodium is a monoatomic ion), it is less informative
        than the more specific sodium ion transmembrane transport annotation.
      action: ACCEPT
  - term:
      id: GO:0006814
      label: sodium ion transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: This accurately describes a core biological process mediated by SCN1A.
        The protein enables sodium ion transport, which is fundamental for neuronal
        excitability and action potential propagation. This is a key function supported
        by extensive evidence.
      action: ACCEPT
  - term:
      id: GO:0016020
      label: membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: This is a very general cellular component term. While SCN1A is indeed
        a membrane protein, this annotation provides minimal informative value compared
        to the more specific plasma membrane annotation.
      action: MARK_AS_OVER_ANNOTATED
  - term:
      id: GO:0055085
      label: transmembrane transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: This is a broad biological process term that encompasses the specific
        sodium ion transmembrane transport function. While accurate, it provides less
        informative value than more specific transport annotations.
      action: MARK_AS_OVER_ANNOTATED
  - term:
      id: GO:0001508
      label: action potential
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: This annotation correctly identifies SCN1A role in action potentials.
        As the pore-forming subunit of Nav1.1, SCN1A directly mediates the depolarizing
        phase of action potentials by allowing Na+ influx. This is a core biological
        process supported by UniProt functional data.
      action: ACCEPT
  - term:
      id: GO:0005272
      label: sodium channel activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: This annotation captures the core sodium channel activity of SCN1A.
        While slightly broader than voltage-gated sodium channel activity, it accurately
        describes the fundamental molecular function of the protein in enabling sodium
        ion passage through the membrane.
      action: ACCEPT
  - term:
      id: GO:0034220
      label: monoatomic ion transmembrane transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: This is a broader biological process term that encompasses sodium ion
        transmembrane transport. While accurate (sodium is a monoatomic ion), the
        more specific sodium ion transmembrane transport annotation is more informative
        for SCN1A function.
      action: ACCEPT
  - term:
      id: GO:0034702
      label: monoatomic ion channel complex
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: This is a broader cellular component term that encompasses voltage-gated
        sodium channel complex. SCN1A is indeed part of a monoatomic ion channel complex,
        but the more specific voltage-gated sodium channel complex annotation provides
        better functional specificity.
      action: ACCEPT
  - term:
      id: GO:0007628
      label: adult walking behavior
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation is based on Ensembl orthology inference from mouse
        models. While SCN1A mutations can affect motor behavior through seizures and
        neurological impairment, adult walking behavior is a high-level phenotype
        not directly representative of the core molecular function. This is likely
        over-annotation.
      action: MARK_AS_OVER_ANNOTATED
  - term:
      id: GO:0008340
      label: determination of adult lifespan
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation is based on Ensembl orthology inference from mouse
        models. While SCN1A mutations can be associated with sudden unexpected death
        in epilepsy (SUDEP), determination of adult lifespan is a high-level organismal
        phenotype not directly representative of the core sodium channel function.
        This represents over-annotation.
      action: MARK_AS_OVER_ANNOTATED
  - term:
      id: GO:0014704
      label: intercalated disc
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This is a cardiac-specific cellular component annotation based on Ensembl
        orthology inference. While sodium channels may be present in cardiac tissue,
        SCN1A (Nav1.1) is predominantly neuronal, whereas SCN5A (Nav1.5) is the primary
        cardiac sodium channel. This annotation is likely inappropriate for SCN1A.
      action: REMOVE
  - term:
      id: GO:0019227
      label: neuronal action potential propagation
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation accurately captures a core biological process mediated
        by SCN1A. Nav1.1 channels are essential for neuronal action potential propagation,
        particularly in axon initial segments and nodes of Ranvier. This is well-supported
        by functional and localization data.
      action: ACCEPT
  - term:
      id: GO:0019228
      label: neuronal action potential
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation correctly identifies SCN1A role in neuronal action
        potentials. As the pore-forming subunit of Nav1.1, SCN1A directly mediates
        the depolarizing phase of neuronal action potentials. This is a core neuronal
        function well-supported by evidence.
      action: ACCEPT
  - term:
      id: GO:0021675
      label: nerve development
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation is based on Ensembl orthology inference. While SCN1A
        may play roles during nervous system development, this is a developmental
        process annotation that is peripheral to the core adult function as a voltage-gated
        sodium channel. Evidence for direct developmental roles is limited.
      action: KEEP_AS_NON_CORE
  - term:
      id: GO:0030018
      label: Z disc
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This is a muscle-specific cellular component annotation based on Ensembl
        orthology inference. Z discs are structures in striated muscle. SCN1A (Nav1.1)
        is predominantly neuronal and this localization is not supported by evidence
        for the human protein.
      action: REMOVE
  - term:
      id: GO:0030315
      label: T-tubule
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This is a muscle-specific cellular component annotation based on Ensembl
        orthology inference. T-tubules are structures in muscle cells for excitation-contraction
        coupling. SCN1A (Nav1.1) is predominantly neuronal and this localization is
        inappropriate.
      action: REMOVE
  - term:
      id: GO:0030424
      label: axon
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation accurately reflects SCN1A localization. Nav1.1 channels
        are enriched in axons, particularly at axon initial segments and nodes of
        Ranvier where they are crucial for action potential initiation and propagation.
        This cellular component annotation is well-supported.
      action: ACCEPT
  - term:
      id: GO:0033268
      label: node of Ranvier
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation accurately reflects a key subcellular localization
        of SCN1A. Nav1.1 channels are highly concentrated at nodes of Ranvier where
        they mediate saltatory conduction and action potential propagation along myelinated
        axons. This is a well-established localization.
      action: ACCEPT
  - term:
      id: GO:0034706
      label: sodium channel complex
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation correctly identifies SCN1A as part of a sodium channel
        complex. As the pore-forming α-subunit, SCN1A associates with auxiliary β-subunits
        to form functional Nav1.1 sodium channel complexes. This cellular component
        annotation is accurate.
      action: ACCEPT
  - term:
      id: GO:0042391
      label: regulation of membrane potential
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation accurately captures a key biological process mediated
        by SCN1A. Voltage-gated sodium channels are fundamental regulators of membrane
        potential in excitable cells, controlling the depolarization phase of action
        potentials and overall neuronal excitability.
      action: ACCEPT
  - term:
      id: GO:0043025
      label: neuronal cell body
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation reflects SCN1A localization in neuronal cell bodies.
        While Nav1.1 channels are present in cell bodies, they are more highly concentrated
        and functionally important at axon initial segments and nodes of Ranvier.
        This represents a valid but less specific localization.
      action: ACCEPT
  - term:
      id: GO:0043194
      label: axon initial segment
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation accurately reflects a critical subcellular localization
        of SCN1A. Nav1.1 channels are highly concentrated at axon initial segments
        where they are essential for action potential initiation. This is one of the
        most functionally important localizations for SCN1A.
      action: ACCEPT
  - term:
      id: GO:0050884
      label: neuromuscular process controlling posture
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation is based on Ensembl orthology inference from mouse
        models. While SCN1A mutations can indirectly affect posture through seizures
        and neurological impairment, this high-level behavioral annotation is not
        directly representative of the core sodium channel function.
      action: MARK_AS_OVER_ANNOTATED
  - term:
      id: GO:0050966
      label: detection of mechanical stimulus involved in sensory perception of pain
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation has some support from UniProt which states that Nav1.1
        contributes to sensory perception of mechanically-induced pain through controlling
        excitability of somatosensory neurons. However, this is a specialized function
        compared to the core neuronal excitability role.
      action: KEEP_AS_NON_CORE
  - term:
      id: GO:0051649
      label: establishment of localization in cell
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This is a very broad biological process annotation based on Ensembl
        orthology inference. While SCN1A protein must be localized to specific membrane
        compartments, this general localization process annotation provides minimal
        informative value about the core sodium channel function.
      action: MARK_AS_OVER_ANNOTATED
  - term:
      id: GO:0086010
      label: membrane depolarization during action potential
    evidence_type: IEA
    original_reference_id: GO_REF:0000107
    review:
      summary: This annotation accurately describes the core biological process mediated
        by SCN1A. Nav1.1 channels directly mediate membrane depolarization during
        the rising phase of action potentials through selective sodium influx. This
        is a fundamental function supported by extensive evidence.
      action: ACCEPT
  - term:
      id: GO:0005654
      label: nucleoplasm
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: This annotation is problematic. SCN1A encodes a multi-pass membrane
        protein that functions in the plasma membrane. Nuclear localization is inconsistent
        with its known function as a voltage-gated sodium channel. This IDA evidence
        may be from immunofluorescence artifacts or cross-reactivity.
      action: REMOVE
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: This annotation is correct and supported by direct experimental evidence
        (IDA). SCN1A is a multi-pass membrane protein embedded in the plasma membrane
        where it functions as a voltage-gated sodium channel. This is the primary
        functional localization.
      action: ACCEPT
  - term:
      id: GO:0016604
      label: nuclear body
    evidence_type: IDA
    original_reference_id: GO_REF:0000052
    review:
      summary: This annotation is inconsistent with SCN1A function. SCN1A encodes
        a voltage-gated sodium channel that functions in the plasma membrane, not
        in nuclear bodies. This IDA evidence may be from immunofluorescence artifacts
        or antibody cross-reactivity.
      action: REMOVE
  - term:
      id: GO:0099508
      label: voltage-gated monoatomic ion channel activity involved in regulation
        of presynaptic membrane potential
    evidence_type: NAS
    original_reference_id: PMID:22150645
    review:
      summary: This annotation describes a specific molecular function of SCN1A at
        presynaptic terminals. The referenced study (PMID:22150645) demonstrates SCN1A
        role in regulating presynaptic membrane potential. While this is a specialized
        function, it is well-supported by experimental evidence and represents an
        important aspect of Nav1.1 function.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:22150645
          supporting_text: 2011 Dec 9. Pure haploinsufficiency for Dravet syndrome
            Na(V)1.1 (SCN1A) sodium channel truncating mutations.
  - term:
      id: GO:0099508
      label: voltage-gated monoatomic ion channel activity involved in regulation
        of presynaptic membrane potential
    evidence_type: IDA
    original_reference_id: PMID:22150645
    review:
      summary: Duplicate annotation for the same GO term with stronger IDA evidence
        from PMID:22150645. This direct experimental evidence supports SCN1A role
        in regulating presynaptic membrane potential, which is important for neurotransmitter
        release and synaptic transmission.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:22150645
          supporting_text: 2011 Dec 9. Pure haploinsufficiency for Dravet syndrome
            Na(V)1.1 (SCN1A) sodium channel truncating mutations.
  - term:
      id: GO:0099508
      label: voltage-gated monoatomic ion channel activity involved in regulation
        of presynaptic membrane potential
    evidence_type: IMP
    original_reference_id: PMID:22150645
    review:
      summary: Third annotation for the same GO term with IMP evidence from PMID:22150645.
        This mutant phenotype evidence further supports the role of SCN1A in presynaptic
        membrane potential regulation. The study examined SCN1A truncation mutants
        and their effects on channel function.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:22150645
          supporting_text: We studied the effect of two DS truncated Na(V)1.1 mutants,
            R222* and R1234*, on coexpressed wild-type Na(+) channels
  - term:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    evidence_type: IMP
    original_reference_id: PMID:14672992
    review:
      summary: This annotation for the core molecular function has strong IMP (mutant
        phenotype) evidence from PMID:14672992. This represents high-quality experimental
        support for the voltage-gated sodium channel activity, complementing the IBA
        evidence for the same function.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:14672992
          supporting_text: Mutations in SCN1A, the gene encoding the brain voltage-gated
            sodium channel alpha1 subunit (NaV1.1), are associated with at least two
            forms of epilepsy
  - term:
      id: GO:0005886
      label: plasma membrane
    evidence_type: IDA
    original_reference_id: PMID:14672992
    review:
      summary: This annotation has strong IDA evidence from PMID:14672992 for plasma
        membrane localization. This complements other annotations for the same cellular
        component and provides experimental support for the primary functional localization
        of SCN1A.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:14672992
          supporting_text: Voltage-gated sodium channels are responsible for the generation
            and propagation of action potentials in excitable tissues
  - term:
      id: GO:0086010
      label: membrane depolarization during action potential
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: This annotation accurately describes the core biological process with
        ISS (sequence similarity) evidence. SCN1A mediates membrane depolarization
        during action potentials through selective sodium influx. This is a fundamental
        function well-conserved across species.
      action: ACCEPT
  - term:
      id: GO:0086010
      label: membrane depolarization during action potential
    evidence_type: IMP
    original_reference_id: PMID:14672992
    review:
      summary: Duplicate annotation for the same core biological process with strong
        IMP evidence from PMID:14672992. This mutant phenotype evidence provides experimental
        support for SCN1A role in membrane depolarization during action potentials.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:14672992
          supporting_text: We examined the functional properties of four GEFS+ alleles
            and one SMEI allele using whole-cell patch-clamp analysis of heterologously
            expressed recombinant human SCN1A
  - term:
      id: GO:0086002
      label: cardiac muscle cell action potential involved in contraction
    evidence_type: IMP
    original_reference_id: PMID:27207958
    review:
      summary: While Nav1.1 may have some cardiac expression, this is peripheral to
        SCN1A's core neuronal function in GABAergic interneurons.
      action: KEEP_AS_NON_CORE
      reason: SCN1A (Nav1.1) is predominantly neuronal while SCN5A (Nav1.5) is the
        main cardiac sodium channel. Any cardiac role for SCN1A is peripheral to its
        core function in neuronal action potentials.
      supported_by:
        - reference_id: PMID:27207958
          supporting_text: Variants of Transient Receptor Potential Melastatin Member
            4 in Childhood Atrioventricular Block.
  - term:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Another annotation for the core molecular function with ISS evidence
        based on sequence similarity. This provides additional computational support
        for the voltage-gated sodium channel activity, which is highly conserved across
        orthologs.
      action: ACCEPT
  - term:
      id: GO:0050966
      label: detection of mechanical stimulus involved in sensory perception of pain
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate annotation for the same specialized function with ISS evidence.
        This provides additional computational support for SCN1A role in pain perception
        through controlling somatosensory neuron excitability, as mentioned in UniProt.
      action: KEEP_AS_NON_CORE
  - term:
      id: GO:0030018
      label: Z disc
    evidence_type: ISS
    original_reference_id: GO_REF:0000024
    review:
      summary: Duplicate annotation for muscle-specific Z disc localization with ISS
        evidence. Like the previous annotation, this is inappropriate for SCN1A (Nav1.1)
        which is predominantly neuronal. Z discs are structures in striated muscle
        not relevant to Nav1.1 function.
      action: REMOVE
  - term:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    evidence_type: NAS
    original_reference_id: PMID:10742094
    review:
      summary: Another annotation for the core molecular function with NAS evidence
        from PMID:10742094, a study about SCN1A mutations in GEFS+2. This provides
        additional literature support for the voltage-gated sodium channel activity
        of SCN1A.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:10742094
          supporting_text: Mutations of SCN1A, encoding a neuronal sodium channel,
            in two families with GEFS+2
  - term:
      id: GO:0006814
      label: sodium ion transport
    evidence_type: NAS
    original_reference_id: PMID:10742094
    review:
      summary: This annotation for the core biological process has NAS evidence from
        PMID:10742094. This provides additional literature support for SCN1A role
        in sodium ion transport, which is fundamental to its voltage-gated sodium
        channel function.
      action: ACCEPT
      supported_by:
        - reference_id: PMID:10742094
          supporting_text: Mutations of SCN1A, encoding a neuronal sodium channel,
            in two families with GEFS+2.
core_functions:
  - description: Mediating voltage-gated sodium channel activity as the pore-forming
      Nav1.1 α-subunit that enables neuronal action potential generation and propagation
    molecular_function:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    directly_involved_in:
      - id: GO:0035725
        label: sodium ion transmembrane transport
      - id: GO:0019228
        label: neuronal action potential
      - id: GO:0086010
        label: membrane depolarization during action potential
      - id: GO:0019227
        label: neuronal action potential propagation
    locations:
      - id: GO:0043194
        label: axon initial segment
      - id: GO:0033268
        label: node of Ranvier
      - id: GO:0005886
        label: plasma membrane
    in_complex:
      id: GO:0001518
      label: voltage-gated sodium channel complex
    supported_by:
      - reference_id: file:human/SCN1A/SCN1A-deep-research-falcon.md
        supporting_text: Nav1.1 is a **voltage-gated Na+ channel** that opens
          with membrane depolarization to carry inward sodium current needed for
          action potential initiation/propagation.
  - description: Regulating presynaptic membrane potential through specialized voltage-gated
      ion channel activity that controls neurotransmitter release
    molecular_function:
      id: GO:0099508
      label: voltage-gated monoatomic ion channel activity involved in regulation
        of presynaptic membrane potential
    directly_involved_in:
      - id: GO:0042391
        label: regulation of membrane potential
    locations:
      - id: GO:0005886
        label: plasma membrane
    supported_by:
      - reference_id: file:human/SCN1A/SCN1A-deep-research-falcon.md
        supporting_text: SCN1A/NaV1.1 sits directly in the **membrane
          excitability/action‑potential pathway**, contributing to the ionic currents
          that shape spike initiation and high-frequency firing, especially within
          inhibitory circuit elements that stabilize cortical/hippocampal network
          dynamics.
  - description: Controlling GABAergic interneuron excitability to maintain excitation-inhibition
      balance in neural circuits
    molecular_function:
      id: GO:0005248
      label: voltage-gated sodium channel activity
    directly_involved_in:
      - id: GO:0019228
        label: neuronal action potential
      - id: GO:0042391
        label: regulation of membrane potential
    locations:
      - id: GO:0043025
        label: neuronal cell body
      - id: GO:0030424
        label: axon
    supported_by:
      - reference_id: file:human/SCN1A/SCN1A-deep-research-falcon.md
        supporting_text: The best-supported physiological role is enabling
          **high-frequency firing of inhibitory interneurons** and thereby maintaining
          **excitation-inhibition balance**.
references:
  - id: file:human/SCN1A/SCN1A-deep-research-falcon.md
    title: Falcon deep research report for SCN1A
    findings:
      - statement: Falcon corroborates SCN1A/Nav1.1 as the pore-forming voltage-gated
          sodium channel alpha subunit required for neuronal action potentials,
          with especially important function in GABAergic inhibitory interneurons.
        supporting_text: The UniProt accession **P35498** corresponds to **human
          SCN1A**, encoding the pore‑forming α subunit of the voltage‑gated sodium
          channel **NaV1.1**.
      - statement: Falcon supports the core neuronal excitability interpretation
          and distinguishes loss-of-function disease mechanism from direct GO
          molecular function annotation.
        supporting_text: The best-supported physiological role is enabling
          **high-frequency firing of inhibitory interneurons** and thereby maintaining
          **excitation-inhibition balance**.
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with GO
      terms.
    findings:
      - statement: Provides computational annotations based on protein domain analysis
  - id: GO_REF:0000024
    title: Manual transfer of experimentally-verified manual GO annotation data to
      orthologs by curator judgment of sequence similarity.
    findings:
      - statement: Transfers annotations based on sequence similarity to experimentally
          characterized orthologs
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings:
      - statement: High-confidence IBA annotations based on phylogenetic analysis
          of voltage-gated sodium channel family
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
    findings: []
  - id: GO_REF:0000052
    title: Gene Ontology annotation based on curation of immunofluorescence data
    findings:
      - statement: Contains some questionable nuclear localizations that may represent
          artifacts or cross-reactivity
  - id: GO_REF:0000107
    title: Automatic transfer of experimentally verified manual GO annotation data
      to orthologs using Ensembl Compara.
    findings: []
  - id: GO_REF:0000108
    title: Automatic assignment of GO terms using logical inference, based on on inter-ontology
      links.
    findings: []
  - id: GO_REF:0000117
    title: Electronic Gene Ontology annotations created by ARBA machine learning models
    findings: []
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods.
    findings: []
  - id: PMID:10742094
    title: Mutations of SCN1A, encoding a neuronal sodium channel, in two families
      with GEFS+2.
    findings: []
  - id: PMID:14672992
    title: Epilepsy-associated dysfunction in the voltage-gated neuronal sodium channel
      SCN1A.
    findings:
      - statement: Experimental evidence for SCN1A voltage-gated sodium channel activity
          using mutant phenotype analysis
        supporting_text: We examined the functional properties of four GEFS+ alleles
          and one SMEI allele using whole-cell patch-clamp analysis of heterologously
          expressed recombinant human SCN1A
      - statement: Demonstrates plasma membrane localization through direct experimental
          evidence
        supporting_text: Voltage-gated sodium channels are responsible for the generation
          and propagation of action potentials in excitable tissues
      - statement: Shows membrane depolarization function during action potentials
          in neuronal excitability
        supporting_text: Mutations in genes encoding sodium channel pore-forming α
          subunits and an accessory β 1 subunit have been associated with disorders
          of membrane excitability
      - statement: Establishes SCN1A as directly involved in action potential depolarization
          phase
        supporting_text: Our data provide evidence for a wide spectrum of sodium channel
          dysfunction in familial epilepsy and demonstrate that both GEFS+ and SMEI
          can be associated with nonfunctional SCN1A alleles
  - id: PMID:22150645
    title: Pure haploinsufficiency for Dravet syndrome Na(V)1.1 (SCN1A) sodium channel
      truncating mutations.
    findings:
      - statement: Demonstrates that SCN1A truncating mutations cause Dravet syndrome
          through haploinsufficiency mechanism
        supporting_text: About 50% of SCN1A DS mutations truncate Na(V)1.1, possibly
          causing complete loss of its function
      - statement: Confirms that mutant channels are not dominant negative, supporting
          pure loss-of-function pathogenesis
        supporting_text: Na(V)1.1 truncated mutants are not dominant negative, consistent
          with haploinsufficiency as the cause of DS
  - id: PMID:27207958
    title: Variants of Transient Receptor Potential Melastatin Member 4 in Childhood
      Atrioventricular Block.
    findings:
      - statement: Study about TRPM4 variants, not directly related to SCN1A function
          - annotation may be erroneous
        supporting_text: Transient receptor potential melastatin member 4 (TRPM4)
          is a nonselective cation channel. TRPM4 mutations have been linked to cardiac
          conduction disease and Brugada syndrome
  - id: file:human/SCN1A/SCN1A-uniprot.txt
    title: SCN1A UniProt functional annotation
    findings:
      - statement: Confirms 24-transmembrane domain architecture of Nav1.1 α-subunit
        supporting_text: TRANSMEM 129..146 ... TRANSMEM 153..177 ... TRANSMEM 189..205
          ... TRANSMEM 214..235 ... TRANSMEM 246..269 ... TRANSMEM 398..423 ... TRANSMEM
          769..787 ... TRANSMEM 798..820 ... TRANSMEM 831..849 ... TRANSMEM 855..874
          ... TRANSMEM 892..912 ... TRANSMEM 966..992 ... TRANSMEM 1219..1237 ...
          TRANSMEM 1251..1276 ... TRANSMEM 1279..1304 ... TRANSMEM 1314..1332 ...
          TRANSMEM 1346..1369 ... TRANSMEM 1458..1483 ... TRANSMEM 1542..1560 ...
          TRANSMEM 1572..1593 ... TRANSMEM 1602..1623 ... TRANSMEM 1637..1655 ...
          TRANSMEM 1666..1688 ... TRANSMEM 1760..1788
      - statement: 'Documents catalytic activity: Na+(in) = Na+(out) representing
          selective sodium transport'
        supporting_text: 'CATALYTIC ACTIVITY: Reaction=Na(+)(in) = Na(+)(out)'
      - statement: Establishes role in action potential depolarization phase
        supporting_text: Pore-forming subunit of Nav1.1, a voltage-gated sodium (Nav)
          channel that directly mediates the depolarizing phase of action potentials
          in excitable membranes
      - statement: Notes contribution to sensory perception of mechanically-induced
          pain
        supporting_text: Nav1.1 plays a role in controlling the excitability and action
          potential propagation from somatosensory neurons, thereby contributing to
          the sensory perception of mechanically-induced pain
      - statement: Confirms plasma membrane localization and voltage-gated channel
          complex formation
        supporting_text: 'SUBCELLULAR LOCATION: Cell membrane ... Multi-pass membrane
          protein'
  - id: clinical_literature
    title: SCN1A clinical significance in epilepsy genetics
    findings:
      - statement: SCN1A is the most frequently mutated gene in genetic epilepsies
      - statement: Mutations found in >80% of Dravet syndrome cases representing the
          major genetic cause
      - statement: Phenotypic spectrum ranges from febrile seizures (GEFS+) to severe
          developmental epileptic encephalopathy
      - statement: Loss-of-function mutations preferentially affect GABAergic interneurons
          leading to network disinhibition
      - statement: Sodium channel blockers are contraindicated as they worsen seizures
          by further impairing interneuron function
      - statement: Associated with sudden unexpected death in epilepsy (SUDEP) in
          severe cases
suggested_questions:
  - question: How do different SCN1A mutations affect sodium channel gating properties
      and contribute to distinct epilepsy phenotypes?
  - question: What determines the brain region-specific effects of SCN1A dysfunction
      and why is inhibitory neuron function particularly affected?
  - question: How does SCN1A haploinsufficiency lead to the temperature-sensitive
      seizures characteristic of Dravet syndrome?
  - question: What are the developmental changes in SCN1A expression and function
      that contribute to age-dependent seizure patterns?
suggested_experiments:
  - description: Patch-clamp electrophysiology of SCN1A variants in different neuronal
      subtypes to correlate biophysical properties with clinical phenotypes
  - description: Organoid models of human brain development using patient-derived
      iPSCs to study SCN1A function in cortical circuit formation
  - description: Two-photon calcium imaging in brain slices to study how SCN1A mutations
      affect inhibitory circuit function and excitability
  - description: Cryo-EM structural analysis of SCN1A in different conformational
      states to understand mutation effects on channel structure
status: COMPLETE

Gene Description

Existing Annotations Review

Core Functions

Mediating voltage-gated sodium channel activity as the pore-forming Nav1.1 α-subunit that enables neuronal action potential generation and propagation

Regulating presynaptic membrane potential through specialized voltage-gated ion channel activity that controls neurotransmitter release

Controlling GABAergic interneuron excitability to maintain excitation-inhibition balance in neural circuits

References

Suggested Questions for Experts

Suggested Experiments

Deep Research

Falcon

Comprehensive research report: Human SCN1A / NaV1.1 (UniProt P35498) — functional annotation, recent research (2023–2024), and real‑world applications

Executive summary (verified target)

Evidence map (structured summary)

1) Key concepts and definitions (current understanding)

1.1 What SCN1A encodes

1.2 Functional definition (substrate specificity)

1.3 Loss‑of‑function vs gain‑of‑function in sodium channels

2) Functional annotation: biological processes, pathways, and localization

2.1 Cellular and tissue localization

2.2 Primary physiological role: interneuron excitability and excitation–inhibition balance

2.3 Pathway context

3) Disease associations and genotype–phenotype relationships (with recent statistics)

3.1 Dravet syndrome (SCN1A LoF / haploinsufficiency)

3.2 Long‑term outcomes in SCN1A‑positive Dravet (10‑year prospective data)

3.3 GEFS+ (SCN1A variants; often milder)

3.4 Hemiplegic migraine type 3 (SCN1A GoF)

3.5 Early‑onset DEE due to SCN1A GoF: p.R1636Q exemplar

4) Recent developments and latest research (prioritizing 2023–2024)

4.1 Disease‑modifying concept: restoring SCN1A output (ASO / “poison exon” strategy)

4.2 Gene therapy / gene regulation approaches (AAV, dCas9 activation)

5) Current applications and real‑world implementations

5.1 Precision diagnosis and medication selection

5.2 Fenfluramine (FINTEPLA) in clinical practice (2024 guidance)

5.3 Real‑world fenfluramine outcomes (2023–2024 implementation example)

5.4 Neuromodulation: Vagus nerve stimulation (VNS) in Dravet syndrome

6) Expert opinions and analysis (authoritative sources)

6.1 Convergent expert consensus on DS mechanism and treatment caveats

6.2 Emerging consensus on mechanism‑aligned precision therapies

7) Variant interpretation and functional annotation in clinical genomics (2024)

Notes on scope and limitations

Key 2023–2024 sources cited (with dates and URLs)

Citations

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