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Updated with 2023-2024 research findings
CAMK2A encodes the alpha subunit of Ca²⁺/calmodulin-dependent protein kinase II (CaMKII), a multifunctional Ser/Thr protein kinase pivotal for neuronal signaling (www.ncbi.nlm.nih.gov) (flybase.org). CaMKIIα is abundantly expressed in the brain and is a central regulator of synaptic plasticity, underlying processes such as long-term potentiation (LTP) and learning and memory (www.ncbi.nlm.nih.gov) (flybase.org). Upon calcium influx (e.g. through NMDA-type glutamate receptors), CaMKIIα is activated by Ca²⁺-calmodulin binding, which releases its autoinhibitory regulatory segment (www.cell.com). The kinase then autophosphorylates at Thr286 in the regulatory domain, a modification that renders its activity partly Ca²⁺-independent (constitutive) (www.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). This autophosphorylation event effectively “stores” the transient Ca²⁺ signal as prolonged kinase activity, enabling CaMKIIα to act as a molecular memory of calcium spikes (www.cell.com) (pmc.ncbi.nlm.nih.gov). Active CaMKIIα can translocate to synapses and bind to the NR2B (GluN2B) subunit of NMDA receptors at the postsynaptic site (pmc.ncbi.nlm.nih.gov). This targeting initiates downstream signaling and structural changes – for example, CaMKII triggers accumulation of AMPA-type glutamate receptors at the synapse, strengthening synaptic transmission during LTP (pmc.ncbi.nlm.nih.gov). In summary, CAMK2A’s product is a kinase that decodes calcium signals and orchestrates phosphorylation of numerous substrates, thereby modulating synaptic efficacy and neuronal response to activity (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These unique biochemical properties (Ca²⁺/CaM activation, Thr286 autophosphorylation, and sustained activity) underline CaMKIIα’s role as a key molecular switch for synaptic plasticity and memory formation (www.cell.com) (pmc.ncbi.nlm.nih.gov).
CaMKIIα is predominantly a neuronal protein localized to the cytoplasm and synapses of excitatory neurons. It is especially enriched in the postsynaptic density (PSD) of glutamatergic synapses, where it constitutes a major structural and functional component (flybase.org). In fact, CaMKII (α/β) is so abundant at the synapse that together these subunits comprise an estimated ~2% of total protein in the adult hippocampus (pmc.ncbi.nlm.nih.gov). Under basal conditions, CaMKIIα is found in the cytosol of dendrites and the neuronal cell body, but upon Ca²⁺-CaM activation it rapidly translocates to synapses and concentrates in the PSD (pmc.ncbi.nlm.nih.gov). There, it binds to receptor complexes and scaffolding proteins (e.g. NMDA receptor subunits and PSD-95) to exert its functions. CaMKIIα is also present in dendritic spines, the small protrusions on neurons where excitatory synapses reside, and its activity contributes to spine enlargement during synaptic potentiation (pmc.ncbi.nlm.nih.gov). Some studies indicate CaMKIIα may exist in presynaptic terminals to a lesser extent, influencing neurotransmitter release, though the β isoform might play a larger role in presynaptic actin scaffolds (flybase.org) (pmc.ncbi.nlm.nih.gov). Importantly, CaMKII’s localization is dynamic: calcium-triggered activation exposes a targeting motif that promotes binding to synaptic sites (like NR2B on the postsynaptic membrane), effectively capturing CaMKIIα in the PSD during periods of high activity (pmc.ncbi.nlm.nih.gov). This context-dependent localization to subcellular components such as the PSD, synapse (GO:0045202), and neuronal cell body (GO:0043025) is critical for its role in synaptic signaling and plasticity. (GO terms in italics represent associated cellular components.)
CAMK2A is intimately involved in numerous biological processes in the nervous system. Foremost, it is a master regulator of synaptic plasticity (GO:0048167) – the ability of synapses to strengthen or weaken over time. CaMKIIα is necessary for the induction of long-term potentiation (GO:0060291), a sustained increase in synaptic strength that underlies learning and memory (www.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). It also participates in long-term depression (LTD) and other forms of synaptic modulation, helping tune neural circuit responses to activity (pmc.ncbi.nlm.nih.gov). By mediating these changes in synaptic efficacy, CAMK2A’s kinase activity is directly tied to learning and memory processes (GO:0007611) (www.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Mice lacking CaMKIIα cannot establish normal LTP and exhibit impaired spatial learning, highlighting this gene’s role in memory consolidation (www.ncbi.nlm.nih.gov). Beyond synaptic plasticity, CAMK2A contributes to neurodevelopmental processes. Proper CaMKIIα function is required for healthy neuronal development and migration – for example, disturbances in CaMKII autophosphorylation lead to defects in neuronal positioning during brain development (pmc.ncbi.nlm.nih.gov). The kinase also influences dendritic spine morphogenesis and synapse formation, as active CaMKII can stabilize actin cytoskeleton and recruit synaptic proteins to shape spine structure (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). Additionally, CaMKIIα is involved in calcium signaling pathways (GO:0019722) broadly: it decodes Ca²⁺ oscillations in various cell types, and while its highest importance is in neurons, CaMKII activity also affects processes like muscle contraction and insulin signaling in other contexts (mediated by other isoforms in the family) (flybase.org). In summary, CAMK2A is crucial for activity-dependent neuronal plasticity, cognitive processes, and aspects of neurodevelopment, integrating calcium signals into longer-term biological responses.
Genetic disruptions of CAMK2A are associated with human neurological disorders, underscoring its importance in cognitive function. Intellectual disability (ID) is a primary phenotype linked to CAMK2A mutations. A landmark study identified numerous de novo heterozygous variants in CAMK2A among individuals with non-syndromic intellectual disability (pmc.ncbi.nlm.nih.gov). These variants often alter key functional domains – for instance, some mutations reduce or enhance Thr286 autophosphorylation, leading to dysregulated kinase activity (pmc.ncbi.nlm.nih.gov). Notably, all tested CAMK2A mutations that affected autophosphorylation also impaired neuronal migration in vitro, highlighting how precise CaMKIIα regulation is required for normal brain development (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In addition to dominant mutations, rare recessive loss-of-function mutations in CAMK2A cause severe neurodevelopmental syndromes. Chia et al. (2018) reported a biallelic CAMK2A missense mutation (p.His477Tyr) in two siblings that led to growth delay, recurrent seizures (epilepsy), and profound intellectual disability (pmc.ncbi.nlm.nih.gov). This mutation lay in the association (hub) domain and prevented CaMKIIα subunits from assembling into the holoenzyme, essentially abolishing kinase function (pmc.ncbi.nlm.nih.gov). The affected individuals’ neurons showed major synaptic defects, reinforcing that CaMKIIα activity is indispensable for synapse development and function (pmc.ncbi.nlm.nih.gov).
Animal model phenotypes concur with human data: CAMK2A knockout mice have no hippocampal LTP and exhibit learning and memory deficits (e.g. poor performance in spatial memory tasks) (www.ncbi.nlm.nih.gov). Mice carrying a Thr286->Ala mutation (blocking autophosphorylation) similarly show impaired memory formation, linking the molecular mechanism to the behavioral phenotype (pmc.ncbi.nlm.nih.gov). Given CaMKIIα’s central role in plasticity, it is not surprising that its dysfunction has been implicated in other conditions. Some CAMK2A mutations or variants have been found in autism spectrum disorder cohorts (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov), and the enzyme is considered one of several key synaptic proteins whose perturbation can contribute to autism or developmental delay. More broadly, CaMKII dysregulation has been proposed to contribute to neurological disease mechanisms – for example, early stages of Alzheimer’s disease feature synaptic plasticity impairments, and it has been suggested that aberrant CaMKII activity (possibly due to β-amyloid interference) might underlie some memory loss in Alzheimer’s (pmc.ncbi.nlm.nih.gov). In summary, both clinical genetics and model studies link CAMK2A to neurodevelopmental disorders (notably ID and autism) and neurological phenotypes like epilepsy, emphasizing its critical role in human brain function. Several of these conditions are now catalogued in OMIM (e.g., Mental retardation, autosomal dominant 53 for CAMK2A-related ID) and are subjects of ongoing research and Gene Ontology disease annotations.
The CaMKIIα protein (human CAMK2A) consists of multiple defined domains that underlie its regulatory properties and assembly into a holoenzyme. At the N-terminus lies the catalytic kinase domain (~residues 1–274), which contains the ATP-binding site and confers serine/threonine protein kinase activity (www.cell.com) (pmc.ncbi.nlm.nih.gov). Adjacent to this is the regulatory segment (autoinhibitory domain), which includes the Ca²⁺/calmodulin-binding region and the Thr286 site. In the inactive state, the regulatory segment blocks the kinase active site, maintaining the enzyme in an autoinhibited conformation (www.cell.com). Binding of Ca²⁺-CaM to this segment induces a conformational change that relieves autoinhibition, allowing the kinase domain to phosphorylate substrates (including autophosphorylation at Thr286) (www.cell.com). Following the regulatory segment is a variable linker region of flexible length; notably, this region differs among CaMKII isoforms (the α and β subunits have the greatest divergence here) (pmc.ncbi.nlm.nih.gov).
At the C-terminus, CAMK2A harbors the association (hub) domain (~residues 315–478) responsible for multimerization (www.cell.com) (pmc.ncbi.nlm.nih.gov). Through the hub domain, CaMKIIα assembles into a large oligomeric complex: typically 12 subunits (occasionally 14) come together as two stacked hexameric rings, forming the characteristic dodecameric CaMKII holoenzyme (www.cell.com). This dodecameric assembly is a hallmark of CaMKII structure and is crucial for its function, as it facilitates cooperative activation and inter-subunit autophosphorylation within the holoenzyme (pmc.ncbi.nlm.nih.gov). The overall subunit architecture – kinase domain, CaM-binding regulatory segment, flexible linker, and oligomerization hub – is conserved in all CaMKII family members (www.cell.com) (pmc.ncbi.nlm.nih.gov). CAMK2A (α) and CAMK2B (β) share ~90% sequence identity and domain organization, but CAMK2B contains an additional motif in the variable region that binds F-actin, targeting CaMKIIβ to the cytoskeletal actin network (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). (CAMK2A lacks this actin-binding segment, which partly explains functional differences in synapse localization between α and β subunits (pmc.ncbi.nlm.nih.gov).) Multiple splice variants of CAMK2A have been identified (www.ncbi.nlm.nih.gov), though all isoforms retain the core domains described above. Key functional sites include the ATP-binding pocket (for catalytic activity), the calmodulin-binding/autoinhibitory segment (controlling activation), and the T286 autophosphorylation site (critical for sustained activity). Together, these domains and motifs enable CaMKIIα’s unique regulatory features: autoinhibition, cooperative activation, and oligomeric signaling.
CAMK2A shows a tissue-enriched expression profile, with very high levels in the brain and much lower expression elsewhere (www.ncbi.nlm.nih.gov) (v18.proteinatlas.org). According to RNA expression datasets, CAMK2A is brain-enriched (especially in the cerebral cortex and hippocampus) and is one of the most abundant mRNAs/proteins in forebrain regions (v18.proteinatlas.org). In human tissue panels, CAMK2A’s expression is largely restricted to the central nervous system – consistent with its specialized role in neurons – and within the brain it is particularly enriched in excitatory neurons of the cortex, hippocampal formation, amygdala, and other regions involved in higher cognitive function (v18.proteinatlas.org). During development, Camk2a expression in rodents is low in early embryonic brain but dramatically upregulates postnatally, coinciding with synapse formation and maturation of neural circuits (pmc.ncbi.nlm.nih.gov). This contrasts with Camk2b (β), which is expressed earlier in development; together, the temporal and spatial expression of α vs. β subunits ensure CaMKII holoenzymes are present throughout neuronal development and in the adult brain (pmc.ncbi.nlm.nih.gov).
In terms of regulation, CAMK2A expression is controlled at multiple levels. Transcriptionally, neuronal activity can influence Camk2a gene expression, and there is evidence that activity-dependent transcription factors (such as CREB) might upregulate CAMK2A in response to sustained activity, helping neurons adjust their complement of CaMKII during plasticity. Additionally, the CAMK2A gene undergoes alternative splicing (producing several transcript variants), which may affect the length of the variable linker region and thus the subcellular targeting or assembly properties of the kinase (www.ncbi.nlm.nih.gov). At the protein level, CaMKIIα’s activity is tightly regulated by post-translational modifications. Calcium/calmodulin binding and autophosphorylation at T286 are the primary regulatory switches (www.ncbi.nlm.nih.gov), but other modifications (e.g. methionine oxidation or additional phosphorylation sites) can fine-tune its activity and interactions (pmc.ncbi.nlm.nih.gov). Autophosphorylation not only sustains activity but also influences subcellular localization – for instance, Thr286-phosphorylated CaMKIIα has higher affinity for the PSD and substrates there (pmc.ncbi.nlm.nih.gov). Finally, protein turnover and degradation (e.g. via the proteasome) can regulate CaMKIIα levels over longer timescales to maintain proteostasis in neurons. In summary, CAMK2A is highly and selectively expressed in the brain, with its gene and protein subject to complex regulatory mechanisms that ensure CaMKIIα is produced at the right times and kept responsive to calcium signals in neurons.
The CaMKII family, including CAMK2A, is highly conserved in evolution, reflecting its fundamental role in cellular signaling. CaMKII genes are found across metazoans: for example, C. elegans has a CaMKII ortholog (UNC-43) and Drosophila melanogaster has a single CamkII gene, both of which perform analogous functions in those organisms (pmc.ncbi.nlm.nih.gov) (flybase.org). In fruit flies, the lone CaMKII ortholog can substitute many functions of the mammalian isoforms; disruption of Drosophila CamkII leads to severe viability and neural defects (loss-of-function mutations are lethal in homozygotes, and partial knock-down causes learning deficits) (flybase.org). This indicates that the role of CaMKII in learning and memory is ancient and preserved. In vertebrates, the CaMKII family expanded to multiple genes: humans have four paralogs (α, β, γ, δ), which arose from gene duplication events and now form a family of holoenzyme subunits (www.ncbi.nlm.nih.gov) (flybase.org). CAMK2A and CAMK2B are the predominant neural isoforms and are ~85% identical in sequence, with conservation of all key functional domains (kinase, regulatory, hub) between them and even with invertebrate CaMKII (pmc.ncbi.nlm.nih.gov). The distinctive dodecameric assembly of CaMKII is also evolutionarily conserved – structural studies show that CaMKII homologs in distant species assemble into similar 12-subunit complexes . This conservation of structure and sequence suggests strong selective pressure to maintain CaMKII’s unique biochemical properties (cooperative activation, molecular memory) across species. Functionally, studies in model organisms demonstrate conservation as well: knockout mice lacking Camk2a have memory deficits as noted, Drosophila with CamkII mutations show impaired learning, and C. elegans mutants in unc-43 display abnormal neural development and signaling (flybase.org) (pmc.ncbi.nlm.nih.gov). Even the human disease associations have parallels in model systems – for instance, expressing a disease-causing human CAMK2A mutation in worms produced similar synaptic defects (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). In summary, CAMK2A’s sequence and functions are widely conserved in the animal kingdom, highlighting its fundamental importance: from worms to humans, CaMKII serves as a critical Ca²⁺-responsive regulator of neural plasticity and behavior.
Research on CAMK2A/CaMKIIα spans decades, with several pivotal findings that established its functions and mechanisms:
Role in Learning and Memory: Early gene knockout studies provided the first clear evidence of CaMKIIα’s importance. Silva et al. in the 1990s generated Camk2a-deficient mice, which revealed that CaMKIIα is essential for hippocampal LTP and spatial learning (www.ncbi.nlm.nih.gov). These knockout mice could not sustain LTP and showed deficits in memory tasks, linking the gene to cognitive function. Later, Giese et al. (1998) created a mouse with a Thr286→Ala mutation (preventing autophosphorylation) – this mutant also showed abolished LTP and impaired learning (pmc.ncbi.nlm.nih.gov). Together, these experiments proved that not only is CaMKIIα required for memory, but its autophosphorylation at Thr286 is critical for the persistence of synaptic changes underlying memory storage.
Biochemical Mechanism: Foundational biochemical studies in the 1980s identified CaMKII’s Ca²⁺/calmodulin-dependent activity and autoinhibition. Miller and Kennedy (1986) purified CaMKII and observed its activation by Ca²⁺/CaM and autonomous activity after Ca²⁺ removal, hinting at auto-regulation. The mechanism was clarified when autophosphorylation was discovered: Hoffman, Schwenger, and others showed that CaMKII can autophosphorylate (notably at Thr286 of α) to achieve Ca²⁺-independent activity (www.cell.com). De Koninck & Schulman (1998) further demonstrated that the frequency of Ca²⁺ pulses controls the extent of CaMKII activation – explaining how CaMKII acts as a frequency detector of calcium spikes (www.cell.com). This concept of CaMKII as a “molecular memory” device (storing information about past Ca²⁺ spikes via its phosphorylation state) became a cornerstone of neurobiology (www.cell.com) (pmc.ncbi.nlm.nih.gov). Key evidence for this is that Thr286 autophosphorylation prolongs kinase activity, converting brief Ca²⁺ signals into long-lasting effects in neurons (pmc.ncbi.nlm.nih.gov).
Structural Insights: The architecture of CaMKII was elucidated through a series of structural biology advances. Electron microscopy by Woodgett et al. and others in the 1990s first revealed a hub-and-spoke arrangement of subunits. In 2001, Hoelz et al. solved a crystal structure of the isolated hub domain, showing how it forms a hexameric ring. Finally, in 2011, Chao et al. reported the crystal structure of a full-length autoinhibited CaMKII holoenzyme, confirming that CaMKIIα forms a stacked pair of hexameric rings (dodecamer) with kinase domains emanating outward (www.cell.com). This structural model explained how the regulatory segment of each subunit can block its own kinase domain (autoinhibition) and how CaM binding would relieve this inhibition. It also illuminated how subunits within the holoenzyme could potentially interact or even exchange – leading to phenomena like inter-subunit autophosphorylation and subunit swapping that have been observed in CaMKII (important for maintaining activity over time). These studies provided a concrete molecular basis for CaMKII’s function and opened the door to targeted mutational analysis of its domains.
Human Genetics and Disease Links: More recently, genomic studies have implicated CAMK2A in human neurodevelopmental disorders. Kury et al. (2017) performed exome sequencing in patients with unexplained intellectual disability and identified de novo mutations in CAMK2A (and CAMK2B) (pmc.ncbi.nlm.nih.gov). They showed that these mutations disrupted CaMKII autophosphorylation or stability, and using neuronal cell assays, they demonstrated altered neuronal migration and dendritic arborization in mutants (pmc.ncbi.nlm.nih.gov). This was a critical piece of evidence linking CaMKIIα to human brain development. In 2018, Chia et al. described a homozygous CAMK2A mutation (H477Y) causing severe developmental encephalopathy with epilepsy (pmc.ncbi.nlm.nih.gov). Functional assays (in patient-derived neurons and C. elegans models) confirmed that this mutation abolished normal CaMKII function (by preventing holoenzyme assembly) and led to synaptic impairment (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These findings established CAMK2A as a disease-associated gene (with OMIM entries for CAMK2A-related intellectual disability), expanding its significance from basic neuroscience into clinical genetics.
Reviews and GO Annotations: The accumulating body of literature has been synthesized in comprehensive reviews. For example, Nicoll & Schulman (2023) reviewed “Synaptic memory and CaMKII,” summarizing 40+ years of research and presenting an integrated model for how CaMKII triggers and maintains synaptic changes (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). They also discuss clinical implications, noting that mutations in CaMKII can underlie intellectual disability and neurodevelopmental problems (including some forms of autism) (pmc.ncbi.nlm.nih.gov). Such reviews, along with curated databases, provide valuable overviews that guide Gene Ontology (GO) annotations – linking the molecular functions of CaMKIIα (e.g. calcium-dependent protein kinase activity, calmodulin binding) to biological processes (like synaptic plasticity, memory, neuronal development) and cellular components (such as postsynaptic density). Key experimental evidence from these studies forms the basis for GO terms associated with CAMK2A, ensuring that annotations are supported by well-established findings in the literature.
Recent research has fundamentally challenged the traditional understanding of CaMKII's role in synaptic plasticity. A groundbreaking 2023 Nature study demonstrated that LTP induction requires structural rather than enzymatic functions of CaMKII, particularly its binding to the NMDA receptor subunit GluN2B PMID:37468593. This finding challenges three decades of research that emphasized CaMKII's kinase activity as the primary mechanism for synaptic plasticity.
A 2024 Nature Neuroscience perspective article fundamentally revised the understanding of CaMKII's role in learning and memory PMID:39394404. The research indicates that CaMKII autophosphorylation at Thr286 does not provide the molecular basis for long-term memory storage as previously believed, but instead mediates signal processing for inducing various forms of synaptic plasticity including Hebbian LTP/LTD and non-Hebbian behavioral timescale synaptic plasticity.
Recent research has provided detailed characterization of CaMKII's phosphorylation targets:
AMPA Receptor Regulation: CaMKIIα phosphorylates serine 831 on GluA1 to enhance AMPA receptor conductance, with this modification being critical for LTP expression PMID:31604894.
NMDA Receptor Interactions: The binding between CaMKII's catalytic domain and GluN2B (residues 1290-1309) results in phosphorylation of S1303, with the receptor being a high-affinity substrate (Km in nanomolar range) PMID:29785013.
Stargazin Phosphorylation: CaMKII phosphorylation of stargazin (TARP proteins) leads to anchoring of additional AMPARs at the synapse, contributing to synaptic strengthening PMID:18768684.
Recent clinical research has expanded understanding of CAMK2A-related disorders:
Hyper-activatable Variants: A 2025 study identified a hyper-activatable CAMK2A variant (P212L) associated with intellectual disability, demonstrating causative impact through a heterozygous knock-in mouse model that showed exaggerated LTP and learning impairments PMID:39839084.
Expanded Clinical Phenotypes: Research confirms CAMK2A mutations cause a spectrum of neurodevelopmental disorders including intellectual disability (mild to severe), autism spectrum disorder, epilepsy, global developmental delay, and motor abnormalities PMID:29560374.
A 2024 Cell Reports paper described significant advances in research tools for studying CaMKII, including optical methods for measurement and manipulation, light-induced inhibition/stimulation/sequestration, and three mechanistically distinct classes of specific CaMKII inhibitors PMID:38640903.
Recent research has identified novel non-neuronal roles, including CaMKII's involvement in ferroptosis regulation. A 2025 study showed that interferon-γ-activated CaMKII phosphorylates PSAT1 at serine 337, contributing to ferroptosis resistance in cancer cells PMID:40281343.
Based on the comprehensive research evidence, CAMK2A's core functions that should be prioritized in gene annotations include:
Functions that are real but represent more specialized or context-dependent roles:
Researchers should be cautious about over-annotation in these areas:
When evaluating annotations, prioritize evidence in this order:
1. Direct experimental evidence (IDA) - In vitro and in vivo functional studies
2. Mutant phenotypes (IMP) - Knockout mice and human disease mutations
3. Protein-protein interactions (IPI) - Especially for Ca2+/CaM binding and substrate interactions
4. Structural evidence - Crystal structures and biochemical characterization
5. Sequence similarity (ISS) - Should be used cautiously and only for highly conserved functions
References: The information above is supported by a range of sources including gene/protein databases and primary literature. Notably, NCBI RefSeq provides a summary of CAMK2A's function in synaptic plasticity (www.ncbi.nlm.nih.gov), and OMIM and FlyBase reports highlight its role in intellectual disability (flybase.org). Recent research articles and reviews detail the molecular mechanisms (www.cell.com) (pmc.ncbi.nlm.nih.gov), structural features (www.cell.com), expression patterns (v18.proteinatlas.org), and disease mutations (pmc.ncbi.nlm.nih.gov) (pmc.ncbi.nlm.nih.gov). These references (cited throughout the text) offer a comprehensive evidence base for CAMK2A and are integral for accurate Gene Ontology annotation curation.