jmjd-3.1

UniProt ID: Q95QK3
Organism: Caenorhabditis elegans
Review Status: COMPLETE
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Gene Description

JMJD-3.1 is a JmjC domain-containing lysine-specific demethylase belonging to the UTX/KDM6 family that specifically demethylates H3K27me2/me3, marks associated with transcriptional repression. The enzyme requires Fe(II) as a cofactor for its dioxygenase activity. JMJD-3.1 functions in the nucleus where it removes repressive H3K27 methylation marks at specific loci to enable gene activation. Unlike the related UTX-1 which is the dominant global H3K27 demethylase during development, JMJD-3.1 acts more locus-specifically and contributes primarily to stress response pathways including the mitochondrial unfolded protein response (UPRmt) and heat shock response. It is required for the robust transdifferentiation of the Y rectal epithelial cell into the PDA motor neuron during larval development. Overexpression of jmjd-3.1 extends lifespan in a manner dependent on UPRmt components (ATFS-1, UBL-5, CLPP-1).

Existing Annotations Review

GO Term Evidence Action Reason
GO:0010468 regulation of gene expression
IBA
GO_REF:0000033
ACCEPT
Summary: JMJD-3.1 regulates gene expression by removing repressive H3K27me2/me3 marks, thereby enabling transcriptional activation. This is well-supported by studies showing jmjd-3.1 is required for stress-induced gene expression programs (UPRmt, HSR) and for gene activation during transdifferentiation (PMID:25124442, PMID:27133168).
Reason: The IBA annotation accurately captures that jmjd-3.1 regulates gene expression. As an H3K27 demethylase, its core function is to remove repressive chromatin marks and enable transcriptional activation of specific gene sets. This is a parent term to more specific processes and is appropriate for the phylogenetic inference.
Supporting Evidence:
PMID:25124442
a conserved H3K27me3/me2 demethylase, JMJD-3.1, and the H3K4 methyltransferase Set1 complex cooperate to ensure invariant transdifferentiation (Td) of postmitotic Caenorhabditis elegans hindgut cells into motor neurons
PMID:27133168
We identify the conserved histone lysine demethylases jmjd-1.2/PHF8 and jmjd-3.1/JMJD3 as positive regulators of lifespan in response to mitochondrial dysfunction across species
file:worm/jmjd-3.1/jmjd-3.1-deep-research-falcon.md
model: Edison Scientific Literature
GO:0071558 histone H3K27me2/H3K27me3 demethylase activity
IBA
GO_REF:0000033
ACCEPT
Summary: JMJD-3.1 is a member of the UTX/KDM6 family and contains the conserved JmjC catalytic domain. Experimental evidence from PMID:17713478 and PMID:25124442 demonstrates H3K27me2/me3 demethylase activity. Mutations in catalytic residues abolish function in transdifferentiation assays (PMID:25124442).
Reason: This is the core molecular function of jmjd-3.1. The IBA annotation is consistent with direct experimental evidence from IDA annotations and the known domain architecture (JmjC domain with conserved Fe-binding residues). This represents the primary enzymatic activity of the protein.
Supporting Evidence:
PMID:17713478
mutation of F18E9.5, a Caenorhabditis elegans JMJD3 orthologue, or inhibition of its expression, results in abnormal gonad development
PMID:25124442
a conserved H3K27me3/me2 demethylase, JMJD-3.1
GO:0044666 MLL3/4 complex
IBA
GO_REF:0000033
UNDECIDED
Summary: The IBA annotation infers MLL3/4 complex membership based on orthology to mammalian JMJD3/KDM6B. However, in C. elegans, UTX-1 (not jmjd-3.1) has been shown to associate with SET-16/MLL-like complexes. The literature explicitly notes that jmjd-3.1 partners are not well established and it may act more locus-specifically rather than as part of large chromatin assemblies.
Reason: While mammalian JMJD3/KDM6B is associated with MLL3/4 complexes, direct evidence for C. elegans jmjd-3.1 membership in an equivalent complex is lacking. The literature (Vandamme et al. 2012) specifically found UTX-1 in complex with SET-16 but did not identify jmjd-3.1 complex partners. The phylogenetic inference may not hold in this case given the functional divergence between UTX-1 and JMJD-3 paralogs in C. elegans. More biochemical evidence is needed to confirm or refute this annotation.
Supporting Evidence:
PMID:22570628
Biochemical analysis identified UTX-1 as a component of a complex that includes SET-16(MLL)
GO:0000978 RNA polymerase II cis-regulatory region sequence-specific DNA binding
IBA
GO_REF:0000033
REMOVE
Summary: This annotation suggests jmjd-3.1 has sequence-specific DNA binding activity at Pol II regulatory regions. However, jmjd-3.1 is recruited to chromatin through protein-protein interactions (e.g., with transcription factors like UNC-3) rather than through intrinsic sequence-specific DNA binding. The protein lacks recognizable DNA-binding domains.
Reason: JMJD-3.1 does not contain canonical sequence-specific DNA-binding domains. While it functions at regulatory regions to demethylate H3K27, it is recruited through interactions with transcription factors (e.g., UNC-3 as shown in PMID:25124442) rather than through direct sequence-specific DNA recognition. The chromatin DNA binding annotation (GO:0031490) is more appropriate.
Supporting Evidence:
PMID:25124442
phase-specific interactions with transcription factors that have conserved roles in cell plasticity and terminal fate selection
GO:0031490 chromatin DNA binding
IBA
GO_REF:0000033
ACCEPT
Summary: JMJD-3.1 functions at chromatin where it demethylates H3K27. The protein requires recognition of the H3 tail for its function (PMID:25124442). This general chromatin binding activity is consistent with its role as a histone demethylase.
Reason: As a histone demethylase that acts on chromatin-bound histones, jmjd-3.1 must bind to chromatin to carry out its function. The annotation is appropriate and consistent with the enzymatic mechanism. UniProt also notes a region required for binding and function (residues 418-759).
Supporting Evidence:
PMID:25124442
robust conversion requires stepwise histone-modifying activities, functionally partitioned into discrete phases of Td
GO:0005634 nucleus
IEA
GO_REF:0000044
ACCEPT
Summary: Nuclear localization is well-established for jmjd-3.1 by direct experimental evidence. The protein contains a region required for nuclear localization (residues 369-417) and overexpressed jmjd-3.1::mCherry shows diffuse nuclear localization.
Reason: This IEA annotation is correct and supported by direct experimental evidence (IDA from PMID:25124442). Nuclear localization is essential for jmjd-3.1 function as a chromatin modifier.
Supporting Evidence:
PMID:25124442
functionally partitioned into discrete phases of Td through nuclear degradation of JMJD-3.1
GO:0006325 chromatin organization
IEA
GO_REF:0000043
ACCEPT
Summary: As an H3K27 demethylase, jmjd-3.1 directly modifies chromatin structure by removing methyl groups from histones. This alters the chromatin state from repressive to permissive for transcription.
Reason: H3K27 demethylation directly affects chromatin organization by removing repressive marks and enabling chromatin state transitions. This is a core aspect of jmjd-3.1 function as a histone-modifying enzyme.
Supporting Evidence:
PMID:25124442
Sequential histone-modifying activities determine the robustness of transdifferentiation
GO:0006338 chromatin remodeling
IEA
GO_REF:0000120
MODIFY
Summary: While jmjd-3.1 modifies chromatin through histone demethylation, chromatin remodeling (GO:0006338) specifically refers to ATP-dependent alteration of nucleosome structure. Histone demethylation is a distinct process from ATP-dependent chromatin remodeling.
Reason: Chromatin remodeling in GO specifically refers to ATP-dependent nucleosome repositioning or eviction. JMJD-3.1 is not an ATP-dependent chromatin remodeler but rather a covalent histone modifier. The more appropriate term is 'histone H3-K27 demethylation' (GO:0071557) or 'chromatin organization' (GO:0006325).
GO:0016491 oxidoreductase activity
IEA
GO_REF:0000043
ACCEPT
Summary: JMJD-3.1 catalyzes an oxidative demethylation reaction using Fe(II) and 2-oxoglutarate as cofactors, making it technically an oxidoreductase. However, this is a very general term.
Reason: As a JmjC domain dioxygenase, jmjd-3.1 does have oxidoreductase activity. While this is a broad parent term, it is technically correct for an IEA annotation derived from keyword mapping. The more specific H3K27me2/me3 demethylase activity annotation captures the precise function.
GO:0032452 histone demethylase activity
IEA
GO_REF:0000117
ACCEPT
Summary: JMJD-3.1 is a bona fide histone demethylase with specificity for H3K27me2/me3. This parent term is appropriate.
Reason: This is a correct parent term for the more specific H3K27me2/me3 demethylase activity. The IEA annotation is consistent with experimental evidence.
Supporting Evidence:
PMID:17713478
UTX and JMJD3 are histone H3K27 demethylases involved in HOX gene regulation and development
GO:0046872 metal ion binding
IEA
GO_REF:0000043
ACCEPT
Summary: JMJD-3.1 binds Fe(II) as a required cofactor for its dioxygenase activity. The JmjC domain contains conserved histidine and glutamate residues (H811, E813, H891) that coordinate Fe(II). Additionally, the C-terminal region contains a zinc-binding site (C998, C1001, C1025, C1028).
Reason: Metal ion binding is essential for jmjd-3.1 function. UniProt annotation confirms Fe(II) as cofactor and zinc binding at the C-terminus. While a more specific term like 'iron ion binding' could be used, this general annotation is appropriate for an IEA.
GO:0051213 dioxygenase activity
IEA
GO_REF:0000043
ACCEPT
Summary: The JmjC domain of jmjd-3.1 catalyzes an Fe(II)/2-oxoglutarate-dependent dioxygenase reaction that demethylates H3K27. This is the mechanistic basis for histone demethylation.
Reason: JmjC domain histone demethylases function as dioxygenases, using molecular oxygen and 2-oxoglutarate in a hydroxylation reaction that leads to demethylation. This is biochemically accurate for the enzymatic mechanism.
GO:0005634 nucleus
IDA
PMID:25124442
Transdifferentiation. Sequential histone-modifying activitie...
ACCEPT
Summary: Direct observation of jmjd-3.1 localization using tagged constructs showed diffuse nuclear localization. The protein contains a region (residues 369-417) required for nuclear localization.
Reason: Nuclear localization is directly demonstrated by imaging of tagged jmjd-3.1 constructs. This is essential for its function as a chromatin modifier acting on nuclear histones.
Supporting Evidence:
PMID:25124442
functionally partitioned into discrete phases of Td through nuclear degradation of JMJD-3.1
GO:0060290 transdifferentiation
IMP
PMID:25124442
Transdifferentiation. Sequential histone-modifying activitie...
ACCEPT
Summary: JMJD-3.1 is required for the robust transdifferentiation of the Y rectal epithelial cell into the PDA motor neuron. Loss of function or catalytic dead mutations disrupt this invariant cell fate conversion. The demethylase activity and H3 tail recognition are required for this function.
Reason: This is one of the best-characterized biological processes for jmjd-3.1 in C. elegans. The study demonstrates cell-autonomous requirement and dependence on catalytic activity. However, this represents a specific developmental role rather than the core molecular function of the protein.
Supporting Evidence:
PMID:25124442
a conserved H3K27me3/me2 demethylase, JMJD-3.1, and the H3K4 methyltransferase Set1 complex cooperate to ensure invariant transdifferentiation (Td) of postmitotic Caenorhabditis elegans hindgut cells into motor neurons
PMID:25124442
robust conversion requires stepwise histone-modifying activities, functionally partitioned into discrete phases of Td through nuclear degradation of JMJD-3.1
GO:0071558 histone H3K27me2/H3K27me3 demethylase activity
IDA
PMID:25124442
Transdifferentiation. Sequential histone-modifying activitie...
ACCEPT
Summary: The study demonstrates that jmjd-3.1 functions as an H3K27me3/me2 demethylase in the context of transdifferentiation. Mutations in catalytic residues (G888E, S903F) abolish demethylase activity and function.
Reason: Direct experimental evidence demonstrates H3K27 demethylase activity through functional assays showing that catalytic domain mutations abolish the ability to promote transdifferentiation and demethylate H3K27.
Supporting Evidence:
PMID:25124442
a conserved H3K27me3/me2 demethylase, JMJD-3.1
GO:0071558 histone H3K27me2/H3K27me3 demethylase activity
IMP
PMID:25124442
Transdifferentiation. Sequential histone-modifying activitie...
ACCEPT
Summary: Mutant phenotype analysis shows that loss of jmjd-3.1 or catalytic dead mutations result in failure of transdifferentiation and correlate with H3K27 methylation status.
Reason: IMP evidence from mutant analysis supports the demethylase activity assignment. Mutations in the JmjC catalytic domain residues (HME->TMG at 811-813, G888E, S903F) disrupt function consistent with loss of demethylase activity.
Supporting Evidence:
PMID:25124442
robust conversion requires stepwise histone-modifying activities, functionally partitioned into discrete phases of Td through nuclear degradation of JMJD-3.1
GO:0071558 histone H3K27me2/H3K27me3 demethylase activity
IDA
PMID:17713478
UTX and JMJD3 are histone H3K27 demethylases involved in HOX...
ACCEPT
Summary: This foundational study identified jmjd-3.1 (F18E9.5) as a C. elegans ortholog of human JMJD3 and demonstrated that mutation or RNAi knockdown causes developmental defects consistent with loss of H3K27 demethylase function.
Reason: This is the original study identifying jmjd-3.1 as an H3K27 demethylase ortholog. While the biochemical demonstration was primarily done with human JMJD3, the C. elegans ortholog showed functional conservation in gonad development assays.
Supporting Evidence:
PMID:17713478
mutation of F18E9.5, a Caenorhabditis elegans JMJD3 orthologue, or inhibition of its expression, results in abnormal gonad development
GO:0034620 cellular response to unfolded protein
IMP
PMID:27133168
Two Conserved Histone Demethylases Regulate Mitochondrial St...
NEW
Summary: JMJD-3.1 is necessary and sufficient for activation of the mitochondrial unfolded protein response (UPRmt). Overexpression of jmjd-3.1 induces UPRmt gene expression including hsp-6, dve-1, and spg-7. The lifespan extension by jmjd-3.1 overexpression depends on UPRmt components ATFS-1, UBL-5, and CLPP-1.
Reason: The role of jmjd-3.1 in UPRmt activation is a major characterized function not captured in the current annotation set. Reduction of function of the demethylases potently suppresses longevity and UPRmt induction.
Supporting Evidence:
PMID:27133168
Reduction of function of the demethylases potently suppresses longevity and UPR(mt) induction, while gain of function is sufficient to extend lifespan in a UPR(mt)-dependent manner
GO:0008340 determination of adult lifespan
IMP
PMID:27133168
Two Conserved Histone Demethylases Regulate Mitochondrial St...
NEW
Summary: JMJD-3.1 regulates lifespan in C. elegans. Overexpression extends lifespan while knockdown reduces lifespan and suppresses mitochondrial stress-induced longevity. This is an evolutionarily conserved role as mammalian orthologs also regulate longevity.
Reason: Lifespan regulation is a well-documented phenotype for jmjd-3.1, mediated through its effects on stress response gene expression and proteostasis.
Supporting Evidence:
PMID:27133168
We identify the conserved histone lysine demethylases jmjd-1.2/PHF8 and jmjd-3.1/JMJD3 as positive regulators of lifespan in response to mitochondrial dysfunction across species
PMID:27133168
Reduction of function of the demethylases potently suppresses longevity and UPR(mt) induction, while gain of function is sufficient to extend lifespan in a UPR(mt)-dependent manner

Core Functions

JMJD-3.1 is a JmjC domain-containing dioxygenase that specifically demethylates H3K27me2 and H3K27me3 marks. This is supported by conserved JmjC domain with Fe(II)-binding catalytic residues and orthology to characterized mammalian JMJD3/KDM6B. Unlike UTX-1, jmjd-3.1 acts more at specific loci rather than globally.

JMJD-3.1 is a key regulator of the mitochondrial UPR. Gain of function is sufficient to extend lifespan in a UPRmt-dependent manner. The lifespan-extending effects of jmjd-3.1 depend on UPRmt components ATFS-1, UBL-5, and CLPP-1.

References

Annotation inferences using phylogenetic trees
  • IBA annotations based on orthology to mammalian KDM6B/JMJD3
Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
  • Keyword-based IEA annotations for oxidoreductase, metal binding, dioxygenase
Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping
  • Nuclear localization from UniProt subcellular location
Electronic Gene Ontology annotations created by ARBA machine learning models
  • Histone demethylase activity from ARBA predictions
Combined Automated Annotation using Multiple IEA Methods
  • Chromatin remodeling annotation (potentially over-annotated)
UTX and JMJD3 are histone H3K27 demethylases involved in HOX gene regulation and development.
  • First identification of jmjd-3.1 (F18E9.5) as C. elegans JMJD3 ortholog
    "mutation of F18E9.5, a Caenorhabditis elegans JMJD3 orthologue"
  • RNAi knockdown causes abnormal gonad development
    "mutation of F18E9.5, a Caenorhabditis elegans JMJD3 orthologue, or inhibition of its expression, results in abnormal gonad development"
  • Established H3K27 demethylase activity for JMJD3 family
    "UTX and JMJD3 are histone H3K27 demethylases involved in HOX gene regulation and development"
Transdifferentiation. Sequential histone-modifying activities determine the robustness of transdifferentiation.
  • Direct demonstration of H3K27me3/me2 demethylase activity
    "a conserved H3K27me3/me2 demethylase, JMJD-3.1"
  • Required for Y-to-PDA transdifferentiation
    "JMJD-3.1, and the H3K4 methyltransferase Set1 complex cooperate to ensure invariant transdifferentiation (Td) of postmitotic Caenorhabditis elegans hindgut cells into motor neurons"
  • Functions cell-autonomously with catalytic activity required
    "robust conversion requires stepwise histone-modifying activities"
  • Nuclear localization demonstrated
    "functionally partitioned into discrete phases of Td through nuclear degradation of JMJD-3.1"
  • Interacts with transcription factors including UNC-3
    "phase-specific interactions with transcription factors that have conserved roles in cell plasticity and terminal fate selection"
The C. elegans H3K27 demethylase UTX-1 is essential for normal development, independent of its enzymatic activity.
  • UTX-1 is dominant developmental H3K27 demethylase
    "UTX-1 regulates global levels of H3K27me2/3 in C. elegans"
  • JMJD-3.1 paralogs contribute to locus-specific H3K27 demethylation
    "the loss of utx-1 leads to a more severe phenotype than the loss of jmjd-3.1, which only influences gonadal processes at high temperature and moderately reduces fertility"
  • Triple jmjd-3.1/3.2/3.3 deletion increases global H3K27me3
    "We generated mutant animals carrying mutations in all three JMJD3-like genes and, unexpectedly, we did not detect any additional phenotypes in the triple mutants"
  • UTX-1 associates with SET-16/MLL-like complexes
    "Biochemical analysis identified UTX-1 as a component of a complex that includes SET-16(MLL)"
Two Conserved Histone Demethylases Regulate Mitochondrial Stress-Induced Longevity.
  • jmjd-3.1 necessary and sufficient for UPRmt activation
    "Reduction of function of the demethylases potently suppresses longevity and UPR(mt) induction, while gain of function is sufficient to extend lifespan in a UPR(mt)-dependent manner"
  • jmjd-3.1 is a positive regulator of lifespan
    "We identify the conserved histone lysine demethylases jmjd-1.2/PHF8 and jmjd-3.1/JMJD3 as positive regulators of lifespan in response to mitochondrial dysfunction across species"
  • Evolutionarily conserved role in longevity signaling
    "These findings illustrate an evolutionary conserved epigenetic mechanism that determines the rate of aging downstream of mitochondrial perturbations"
file:worm/jmjd-3.1/jmjd-3.1-deep-research-falcon.md
Deep research report on jmjd-3.1

Suggested Questions for Experts

Q: Does jmjd-3.1 function as part of a larger chromatin-modifying complex in C. elegans, similar to mammalian JMJD3 in MLL3/4 complexes? While UTX-1 associates with SET-16/MLL-like complexes, jmjd-3.1 protein partners remain poorly defined. Understanding whether it acts alone or in a complex would clarify its recruitment mechanism.

Q: What is the genomic targeting mechanism for jmjd-3.1 at stress-responsive loci? JMJD-3.1 appears to act at specific loci rather than globally. The interaction with UNC-3 provides one example, but genome-wide ChIP studies would reveal the full scope of its targets.

Q: How do the three JMJD3 paralogs (jmjd-3.1, jmjd-3.2, jmjd-3.3) partition their functions? Triple deletion shows no additional phenotypes beyond jmjd-3.1 single mutants, suggesting potential redundancy, but individual paralogs may have distinct stress-specific or tissue-specific roles.

Suggested Experiments

Experiment: ChIP-seq for jmjd-3.1 under basal and stress conditions to map genome-wide binding sites and correlate with H3K27me3 changes

Experiment: Co-immunoprecipitation/mass spectrometry of jmjd-3.1 to identify protein interaction partners and potential complex membership

Experiment: Single-cell transcriptomics during Y-to-PDA transdifferentiation in jmjd-3.1 mutants to identify specific gene targets deregulated during cell fate conversion

Tags

caeel-upr-stress

📚 Additional Documentation

Deep Research Falcon

(jmjd-3.1-deep-research-falcon.md)

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organism: worm
gene_id: jmjd-3.1
gene_symbol: jmjd-3.1
uniprot_accession: Q95QK3
protein_description: 'RecName: Full=Lysine-specific demethylase jmjd-3.1 {ECO:0000305};
EC=1.14.11.- {ECO:0000269|PubMed:17713478}; AltName: Full=JmjC domain-containing
protein 3.1 {ECO:0000305};'
gene_info: Name=jmjd-3.1 {ECO:0000312|WormBase:F18E9.5b}; ORFNames=F18E9.5 {ECO:0000312|WormBase:F18E9.5b};
organism_full: Caenorhabditis elegans.
protein_family: Belongs to the UTX family. .
protein_domains: Corepressor-Demethylase. (IPR051630); JmjC_dom. (IPR003347); KDM6_GATAL_sf.
(IPR046941); KDM6A_B-like_C-hel. (IPR048562); JmjC (PF02373)
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citation_count: 13


Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: Q95QK3
  • Protein Description: RecName: Full=Lysine-specific demethylase jmjd-3.1 {ECO:0000305}; EC=1.14.11.- {ECO:0000269|PubMed:17713478}; AltName: Full=JmjC domain-containing protein 3.1 {ECO:0000305};
  • Gene Information: Name=jmjd-3.1 {ECO:0000312|WormBase:F18E9.5b}; ORFNames=F18E9.5 {ECO:0000312|WormBase:F18E9.5b};
  • Organism (full): Caenorhabditis elegans.
  • Protein Family: Belongs to the UTX family. .
  • Key Domains: Corepressor-Demethylase. (IPR051630); JmjC_dom. (IPR003347); KDM6_GATAL_sf. (IPR046941); KDM6A_B-like_C-hel. (IPR048562); JmjC (PF02373)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "jmjd-3.1" matches the protein description above
  2. Verify the organism is correct: Caenorhabditis elegans.
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'jmjd-3.1' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene jmjd-3.1 (gene ID: jmjd-3.1, UniProt: Q95QK3) in worm.

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.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

  • UniProt Accession: Q95QK3
  • Protein Description: RecName: Full=Lysine-specific demethylase jmjd-3.1 {ECO:0000305}; EC=1.14.11.- {ECO:0000269|PubMed:17713478}; AltName: Full=JmjC domain-containing protein 3.1 {ECO:0000305};
  • Gene Information: Name=jmjd-3.1 {ECO:0000312|WormBase:F18E9.5b}; ORFNames=F18E9.5 {ECO:0000312|WormBase:F18E9.5b};
  • Organism (full): Caenorhabditis elegans.
  • Protein Family: Belongs to the UTX family. .
  • Key Domains: Corepressor-Demethylase. (IPR051630); JmjC_dom. (IPR003347); KDM6_GATAL_sf. (IPR046941); KDM6A_B-like_C-hel. (IPR048562); JmjC (PF02373)

MANDATORY VERIFICATION STEPS:

  1. Check if the gene symbol "jmjd-3.1" matches the protein description above
  2. Verify the organism is correct: Caenorhabditis elegans.
  3. Check if protein family/domains align with what you find in literature
  4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'jmjd-3.1' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene jmjd-3.1 (gene ID: jmjd-3.1, UniProt: Q95QK3) in worm.

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.

Plan overview
- Verified identity and context: jmjd-3.1 (UniProt Q95QK3; WormBase F18E9.5/F18E9.5b) encodes a JMJD3-like JmjC-domain histone demethylase of the UTX/KDM6 family in Caenorhabditis elegans. It carries the conserved JmjC catalytic motif and has been genetically and functionally linked to H3K27 demethylation and stress-responsive transcriptional programs (see Evidence Table). (vandamme2012thec.elegans pages 4-4)

Research report: jmjd-3.1 (Q95QK3) functional annotation in C. elegans

1) Key concepts and definitions
- Molecular identity and domains: jmjd-3.1 encodes a JmjC-domain lysine demethylase in the KDM6/UTX family, orthologous to vertebrate JMJD3/KDM6B. The JmjC catalytic domain supports Fe(II)/α-ketoglutarate–dependent demethylation. In nematodes, JMJD3-like proteins (jmjd-3.1/3.2/3.3) and UTX-1 comprise the H3K27 demethylase set. Family assignments and domain architecture in C. elegans are consistent with a corepressor–demethylase role for jmjd-3.1. URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012). (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 8-10)
- Catalytic activity and substrate specificity: Functional and genetic data position jmjd-3.1 as an H3K27me2/3 demethylase acting at specific loci. While triple deletion of jmjd-3.1/3.2/3.3 increases global H3K27me3, single jmjd-3.1 mutants often lack strong global effects, implying locus specificity and partial redundancy with other KDM6 enzymes (UTX-1 being the dominant global H3K27 demethylase). URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012); supportive functional placement in stress pathways: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 8-10, merkwirth2016twoconservedhistone pages 4-6, merkwirth2016twoconservedhistone pages 1-3)
- Subcellular localization: jmjd-3.1 functions in the nucleus; nuclear entry is required for transcriptional effects. Overexpressed jmjd-3.1::mCherry shows diffuse nuclear localization across multiple tissues in transgenic worms. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)

2) Recent developments and latest research
- Mitochondrial stress reprogramming and longevity: jmjd-3.1 is necessary and sufficient to activate the mitochondrial unfolded protein response (UPRmt) and to mediate transcriptional programs downstream of respiratory-chain perturbation. Overexpression of jmjd-3.1 (under its endogenous promoter) induces UPRmt gene expression and extends lifespan, and this pro-longevity effect requires canonical UPRmt components (ATFS-1, UBL-5, CLPP-1). URL: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). While not 2023–2024, this remains the most definitive mechanistic study of jmjd-3.1 in stress-induced longevity. (merkwirth2016twoconservedhistone pages 7-10, merkwirth2016twoconservedhistone pages 4-6, merkwirth2016twoconservedhistone pages 6-7)
- Heat-shock response (HSR) maintenance with age: jmjd-3.1 supports stress-gene inducibility during early adulthood. Loss of jmjd-3.1 compromises HSR target induction and survival after heat shock, while overexpression preserves HSR inducibility and stress resilience in aging adults. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)
- KDM6 family context in development and redundancy: Comparative C. elegans work indicates UTX-1 is the predominant enzyme for global H3K27me2/3 removal during development, whereas JMJD3-like paralogs (including jmjd-3.1) contribute more locus-specifically and in stress/aging contexts. URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012). (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 8-10)

3) Current applications and real-world implementations
- Genetic epistasis to place jmjd-3.1 in UPRmt: RNAi against ubl-5 or atfs-1 suppresses UPRmt induction and lifespan extension in jmjd-3.1 overexpressors, establishing dependency on core UPRmt machinery. This has become a common strategy to test UPRmt involvement in long-lived genetic backgrounds. URL: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). (merkwirth2016twoconservedhistone pages 6-7)
- Chemical probing of H3K27 demethylase activity: The cell-permeable inhibitor GSK-J4 attenuates UPRmt activation in C. elegans, functionally linking H3K27 demethylase activity to mitochondrial stress signaling. URL: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). (merkwirth2016twoconservedhistone pages 4-6)
- Stress-physiology assays in aging: Heat shock survival, thermotolerance, and late-life transcriptional inducibility assays have used jmjd-3.1 mutants and overexpressors to dissect chromatin control of proteostasis with age. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)

4) Expert opinions and analysis from authoritative sources
- Stress and longevity programs require chromatin remodeling: Cell and Molecular Cell studies conclude that histone demethylases act as upstream effectors that license stress-specific transcriptional programs and lifespan extension. jmjd-3.1/JMJD3 is a conserved arthropod/vertebrate demethylase whose induction or activity correlates with UPRmt output and longevity phenotypes. URLs: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016); https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (merkwirth2016twoconservedhistone pages 1-3, labbadia2015repressionofthe pages 6-8)
- Developmental vs stress roles: In C. elegans, UTX-1 plays the dominant developmental H3K27 demethylase role (enzymatic activity-independent developmental functions also reported for UTX-1), while jmjd-3.1 contributes more evidently to stress responses and aging pathways under laboratory conditions. URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012). (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 16-16)

5) Statistics and data from recent studies
- Transcriptional overlap with mitochondrial ETC perturbation: RNA-seq comparing jmjd-3.1 overexpression to cco-1(RNAi) ETC knockdown revealed 1,405 overlapping differentially expressed genes, with 99% (1,385/1,405) concordant directionality; UPRmt genes (e.g., hsp-6, dve-1, spg-7) upregulated and nuclear OXPHOS genes broadly downregulated in both contexts. URL: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). (merkwirth2016twoconservedhistone pages 7-10)
- Genetic dependencies for longevity: Lifespan extension by jmjd-3.1 overexpression is suppressed by ubl-5 RNAi and requires atfs-1 and clpp-1 for UPRmt signaling; jmjd-3.1 knockdown suppresses lifespan extension induced by cco-1(RNAi). URL: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). (merkwirth2016twoconservedhistone pages 6-7)
- Heat-shock response metrics: jmjd-3.1 null mutants show approximately 60% reduction in heat-shock gene induction and diminished survival/recovery after acute heat stress; jmjd-3.1 overexpression increases thermotolerance and preserves inducibility of stress genes. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)
- Longevity effects in adult worms: In a transgenic context, jmjd-3.1 overexpression increased median lifespan by roughly 20% and maximal lifespan by approximately 12% in day-2 adults, with a concomitant ≈20% reduction in brood size and mitigation of age-related motility and pharyngeal phenotypes. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)

Biological processes and pathways
- Mitochondrial UPR pathway positioning: jmjd-3.1 acts upstream of UPRmt transcriptional modules and requires UBL-5 and ATFS-1. Its overexpression is sufficient to recapitulate most of the ETC perturbation–driven transcriptome, emphasizing a chromatin-priming role for mitochondrial stress responses. URL: https://doi.org/10.1016/j.cell.2016.04.012 (May 2016). (merkwirth2016twoconservedhistone pages 7-10, merkwirth2016twoconservedhistone pages 6-7)
- Heat-shock response and proteostasis: jmjd-3.1 maintains stress gene inducibility during the reproductive transition, when the HSR is normally repressed, highlighting a role in age-related proteostasis decline. Nuclear localization is necessary for these effects. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)
- Development and H3K27 demethylation landscape: Family-level work shows UTX-1 strongly controls developmental H3K27me2/3 levels, while jmjd-3.1 and paralogs modulate specific gene sets and contribute to stress/aging programs. Triple deletion of JMJD3-like genes increases global H3K27me3, yet animals remain viable, consistent with nonessential developmental roles for jmjd-3.1 under standard conditions. URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012). (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 8-10)

Subcellular localization and expression
- Localization: Nuclear; nuclear entry is required for transcriptional reprogramming. URL: https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (labbadia2015repressionofthe pages 6-8)
- Tissue expression: Reporter and qPCR data indicate expression in neurons, intestine, muscle, and hypodermis in overexpression lines; endogenous jmjd-3.1 is expressed at levels comparable to utx-1, whereas jmjd-3.2/3.3 are weaker. URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012); https://doi.org/10.1016/j.molcel.2015.06.027 (Aug 2015). (vandamme2012thec.elegans pages 4-4, labbadia2015repressionofthe pages 6-8)

Interaction partners and complexes
- jmjd-3.1 partners are not firmly established in the retrieved literature. By contrast, the related UTX-1 co-purifies with SET-16/MLL-like complexes, suggesting that while UTX-1 integrates into large chromatin assemblies, jmjd-3.1 may be more locus-specific or conditionally recruited during stress responses. URL: https://doi.org/10.1371/journal.pgen.1002647 (May 2012). (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 16-16)

Ambiguity check and symbol verification
- The symbol “jmjd-3.1” in C. elegans refers specifically to the JMJD3-like KDM6 family demethylase encoded by F18E9.5; this is distinct from human JMJD3/KDM6B. All claims herein refer to the C. elegans protein matching UniProt Q95QK3. (vandamme2012thec.elegans pages 4-4)

Limitations and open questions
- Direct biochemical assays in C. elegans establishing jmjd-3.1’s kinetic parameters and genome-wide H3K27 substrate maps under defined stresses remain areas for expansion. Most precise pathway placement derives from genetic/chemical epistasis and transcriptomics. While 2023–2024 nematode reviews acknowledge the KDM6/JMJD3 role in embryonic chromatin and stress physiology, the definitive mechanistic jmjd-3.1 studies remain the 2012–2016 primary literature cited here. (merkwirth2016twoconservedhistone pages 7-10, vandamme2012thec.elegans pages 4-4)

Practical takeaways
- Primary function: H3K27me2/3 demethylase that licenses stress-responsive transcriptional programs, notably UPRmt and aspects of the HSR, in the nucleus. (merkwirth2016twoconservedhistone pages 7-10, labbadia2015repressionofthe pages 6-8, vandamme2012thec.elegans pages 4-4)
- Localization and context: Nuclear demethylase acting at select loci; functions prominently under mitochondrial stress and during early adult proteostasis transitions. (merkwirth2016twoconservedhistone pages 7-10, labbadia2015repressionofthe pages 6-8)
- Pathways: UPRmt (requires ATFS-1, UBL-5, CLPP-1), with reported effects on heat-shock inducibility and longevity; developmental H3K27 regulation predominantly mediated by UTX-1. (merkwirth2016twoconservedhistone pages 6-7, labbadia2015repressionofthe pages 6-8, vandamme2012thec.elegans pages 4-4)

Key evidence table
| Aspect | Key finding (1–3 sentences) | Quantitative details | Organism/context | Source | Citation IDs |
|---|---|---:|---|---|---|
| Identity / family / domains | jmjd-3.1 is a JMJD3-like member of the KDM6 (UTX/JMJD3) family; contains a JmjC catalytic domain and corepressor‑demethylase annotations (matches UniProt Q95QK3 / ORF F18E9.5). | — | Caenorhabditis elegans | Vandamme et al., PLoS Genet (2012) - https://doi.org/10.1371/journal.pgen.1002647 | (vandamme2012thec.elegans pages 4-4) |
| Catalytic activity & substrate | Evidence consistent with H3K27me2/3 demethylase activity (JmjC catalytic motif present); contributes to removal of H3K27me3 at specific loci rather than globally (UTX-1 is dominant global demethylase). | Triple jmjd-3.1/3.2/3.3 deletions ↑ global H3K27me3; single jmjd-3.1 loss often shows little global change. | C. elegans; biochemical/ genetics | Merkwirth et al., Cell (2016) - https://doi.org/10.1016/j.cell.2016.04.012; Vandamme et al., PLoS Genet (2012) - https://doi.org/10.1371/journal.pgen.1002647 | (merkwirth2016twoconservedhistone pages 7-10, vandamme2012thec.elegans pages 4-4) |
| Subcellular localization | jmjd-3.1 shows diffuse nuclear localization; nuclear entry is required for its transcriptional effects (nuclear targeting needed for overexpression phenotypes). | Overexpressed jmjd-3.1::mCherry line shows ~30-fold higher expression than WT (transgenic context). | C. elegans; transgenic reporter studies | Labbadia & Morimoto, Mol Cell (2015) - https://doi.org/10.1016/j.molcel.2015.06.027 | (labbadia2015repressionofthe pages 6-8) |
| Expression / tissue pattern | Expressed in multiple somatic tissues (reported in neurons, intestine, muscle, hypodermis for overexpression reporter); endogenous jmjd-3.1 expressed at levels comparable to utx-1, while jmjd-3.2/3.3 are weaker. | Endogenous comparisons reported qualitatively; transgenic overexpression ≈30× WT (reporter line). | C. elegans | Vandamme et al., PLoS Genet (2012); Labbadia & Morimoto (2015) - https://doi.org/10.1371/journal.pgen.1002647; https://doi.org/10.1016/j.molcel.2015.06.027 | (vandamme2012thec.elegans pages 4-4, labbadia2015repressionofthe pages 6-8) |
| Heat shock response role | jmjd-3.1 is implicated in regulating heat-shock/stress-gene induction: loss reduces stress-induced HSR gene activation and survival after heat shock; overexpression preserves inducibility and increases thermotolerance. | jmjd-3.1 nulls show ~60% reduction in stress-induced HSR gene expression; overexpression increases median and maximal lifespan by ~20% and ~12% respectively in one report (day-2 adults) and reduces brood size ≈20% (transgenic context). | C. elegans; stress assays, transgenics | Labbadia & Morimoto, Mol Cell (2015) - https://doi.org/10.1016/j.molcel.2015.06.027 | (labbadia2015repressionofthe pages 6-8) |
| Mitochondrial UPR (UPRmt) role | jmjd-3.1 is necessary and sufficient to induce the mitochondrial unfolded protein response (UPRmt) and to mediate transcriptional programs downstream of mitochondrial ETC perturbation; acts upstream of core UPRmt factors. | Overexpression overlaps cco-1 RNAi transcriptional response: 1,405 overlapping genes with 99% concordance; pharmacologic inhibitor GSK-J4 blocks UPRmt activation. | C. elegans; UPRmt reporter and RNA‑seq | Merkwirth et al., Cell (2016) - https://doi.org/10.1016/j.cell.2016.04.012 | (merkwirth2016twoconservedhistone pages 7-10) |
| Longevity effects & dependencies | jmjd-3.1 overexpression extends lifespan; jmjd-3.1 is required for ETC/mitochondrial‑stress induced longevity and its lifespan effects depend on UPRmt components. | Lifespan extension reported with jmjd-3.1 OE (percent change context-dependent; Labbadia reported ~20% median increase for OE line); ubl-5, atfs-1, clpp-1 RNAi suppress jmjd-3.1 OE lifespan extension; jmjd-3.1 RNAi suppresses cco-1–mediated longevity. | C. elegans; genetic epistasis & RNAi | Merkwirth et al., Cell (2016) - https://doi.org/10.1016/j.cell.2016.04.012; Labbadia & Morimoto (2015) - https://doi.org/10.1016/j.molcel.2015.06.027 | (merkwirth2016twoconservedhistone pages 7-10, labbadia2015repressionofthe pages 6-8) |
| Developmental phenotypes | Single jmjd-3.1 mutants are viable with minor/no strong global developmental defects; combined deletion of JMJD3-like genes yields increased H3K27me3 but animals remain largely viable (suggesting redundancy or limited developmental requirement). | Triple jmjd-3.1/3.2/3.3 deletion increased global H3K27me3 but animals remained fertile/viable with modest gonadal defects; utx-1 shows stronger developmental necessity. | C. elegans; genetic deletion studies | Vandamme et al., PLoS Genet (2012) - https://doi.org/10.1371/journal.pgen.1002647 | (vandamme2012thec.elegans pages 4-4) |
| Specificity vs other stress pathways | Evidence is context-dependent: Merkwirth et al. report jmjd-3.1 specifically affects UPRmt with little effect on ER UPR or antioxidant reporters; Labbadia et al. report jmjd-3.1 influences heat-shock response—implying pathway-specific and experimental-condition differences. | Merkwirth: little/no effect on hsp-4p::gfp (ER UPR) or hsp-16.2p::gfp (HSR) in their assays; Labbadia: ~60% reduction in HS gene induction in jmjd-3.1 nulls. | C. elegans; stress-pathway assays | Merkwirth et al., Cell (2016) - https://doi.org/10.1016/j.cell.2016.04.012; Labbadia & Morimoto (2015) - https://doi.org/10.1016/j.molcel.2015.06.027 | (merkwirth2016twoconservedhistone pages 7-10, labbadia2015repressionofthe pages 6-8) |
| Interaction partners / complexes | Direct interaction partners for jmjd-3.1 are not well defined in available studies; by contrast UTX‑1 was biochemically found in complexes with SET‑16 (MLL‑like) and associated chromatin regulators, suggesting jmjd-3.1 may act more locus‑specifically while UTX‑1 engages multi‑subunit complexes. | UTX‑1 biochemical complex membership reported (SET‑16); jmjd-3.1 partners not specified in retrieved literature. | C. elegans; biochemical pulldown/genetics | Vandamme et al., PLoS Genet (2012) - https://doi.org/10.1371/journal.pgen.1002647 | (vandamme2012thec.elegans pages 4-4, vandamme2012thec.elegans pages 16-16) |

Table: Concise, source-linked summary of experimental evidence for C. elegans jmjd-3.1 (UniProt Q95QK3), covering identity, catalytic activity, localization, pathway roles, phenotypes and quantitative outcomes from Vandamme 2012, Merkwirth 2016, and Labbadia 2015.

References

  1. (vandamme2012thec.elegans pages 4-4): Julien Vandamme, Gaëlle Lettier, Simone Sidoli, Elia Di Schiavi, Ole Nørregaard Jensen, and Anna Elisabetta Salcini. The c. elegans h3k27 demethylase utx-1 is essential for normal development, independent of its enzymatic activity. PLoS Genetics, 8:e1002647, May 2012. URL: https://doi.org/10.1371/journal.pgen.1002647, doi:10.1371/journal.pgen.1002647. This article has 84 citations and is from a domain leading peer-reviewed journal.

  2. (vandamme2012thec.elegans pages 8-10): Julien Vandamme, Gaëlle Lettier, Simone Sidoli, Elia Di Schiavi, Ole Nørregaard Jensen, and Anna Elisabetta Salcini. The c. elegans h3k27 demethylase utx-1 is essential for normal development, independent of its enzymatic activity. PLoS Genetics, 8:e1002647, May 2012. URL: https://doi.org/10.1371/journal.pgen.1002647, doi:10.1371/journal.pgen.1002647. This article has 84 citations and is from a domain leading peer-reviewed journal.

  3. (merkwirth2016twoconservedhistone pages 4-6): Carsten Merkwirth, Virginija Jovaisaite, Jenni Durieux, Olli Matilainen, Sabine D. Jordan, Pedro M. Quiros, Kristan K. Steffen, Evan G. Williams, Laurent Mouchiroud, Sarah U. Tronnes, Virginia Murillo, Suzanne C. Wolff, Reuben J. Shaw, Johan Auwerx, and Andrew Dillin. Two conserved histone demethylases regulate mitochondrial stress-induced longevity. Cell, 165:1209-1223, May 2016. URL: https://doi.org/10.1016/j.cell.2016.04.012, doi:10.1016/j.cell.2016.04.012. This article has 388 citations and is from a highest quality peer-reviewed journal.

  4. (merkwirth2016twoconservedhistone pages 1-3): Carsten Merkwirth, Virginija Jovaisaite, Jenni Durieux, Olli Matilainen, Sabine D. Jordan, Pedro M. Quiros, Kristan K. Steffen, Evan G. Williams, Laurent Mouchiroud, Sarah U. Tronnes, Virginia Murillo, Suzanne C. Wolff, Reuben J. Shaw, Johan Auwerx, and Andrew Dillin. Two conserved histone demethylases regulate mitochondrial stress-induced longevity. Cell, 165:1209-1223, May 2016. URL: https://doi.org/10.1016/j.cell.2016.04.012, doi:10.1016/j.cell.2016.04.012. This article has 388 citations and is from a highest quality peer-reviewed journal.

  5. (labbadia2015repressionofthe pages 6-8): Johnathan Labbadia and Richard I. Morimoto. Repression of the heat shock response is a programmed event at the onset of reproduction. Molecular cell, 59 4:639-50, Aug 2015. URL: https://doi.org/10.1016/j.molcel.2015.06.027, doi:10.1016/j.molcel.2015.06.027. This article has 365 citations and is from a highest quality peer-reviewed journal.

  6. (merkwirth2016twoconservedhistone pages 7-10): Carsten Merkwirth, Virginija Jovaisaite, Jenni Durieux, Olli Matilainen, Sabine D. Jordan, Pedro M. Quiros, Kristan K. Steffen, Evan G. Williams, Laurent Mouchiroud, Sarah U. Tronnes, Virginia Murillo, Suzanne C. Wolff, Reuben J. Shaw, Johan Auwerx, and Andrew Dillin. Two conserved histone demethylases regulate mitochondrial stress-induced longevity. Cell, 165:1209-1223, May 2016. URL: https://doi.org/10.1016/j.cell.2016.04.012, doi:10.1016/j.cell.2016.04.012. This article has 388 citations and is from a highest quality peer-reviewed journal.

  7. (merkwirth2016twoconservedhistone pages 6-7): Carsten Merkwirth, Virginija Jovaisaite, Jenni Durieux, Olli Matilainen, Sabine D. Jordan, Pedro M. Quiros, Kristan K. Steffen, Evan G. Williams, Laurent Mouchiroud, Sarah U. Tronnes, Virginia Murillo, Suzanne C. Wolff, Reuben J. Shaw, Johan Auwerx, and Andrew Dillin. Two conserved histone demethylases regulate mitochondrial stress-induced longevity. Cell, 165:1209-1223, May 2016. URL: https://doi.org/10.1016/j.cell.2016.04.012, doi:10.1016/j.cell.2016.04.012. This article has 388 citations and is from a highest quality peer-reviewed journal.

  8. (vandamme2012thec.elegans pages 16-16): Julien Vandamme, Gaëlle Lettier, Simone Sidoli, Elia Di Schiavi, Ole Nørregaard Jensen, and Anna Elisabetta Salcini. The c. elegans h3k27 demethylase utx-1 is essential for normal development, independent of its enzymatic activity. PLoS Genetics, 8:e1002647, May 2012. URL: https://doi.org/10.1371/journal.pgen.1002647, doi:10.1371/journal.pgen.1002647. This article has 84 citations and is from a domain leading peer-reviewed journal.

Citations

  1. labbadia2015repressionofthe pages 6-8
  2. merkwirth2016twoconservedhistone pages 6-7
  3. merkwirth2016twoconservedhistone pages 4-6
  4. merkwirth2016twoconservedhistone pages 7-10
  5. merkwirth2016twoconservedhistone pages 1-3
  6. https://doi.org/10.1371/journal.pgen.1002647
  7. https://doi.org/10.1016/j.cell.2016.04.012
  8. https://doi.org/10.1016/j.molcel.2015.06.027
  9. https://doi.org/10.1016/j.cell.2016.04.012;
  10. https://doi.org/10.1371/journal.pgen.1002647;
  11. https://doi.org/10.1371/journal.pgen.1002647,
  12. https://doi.org/10.1016/j.cell.2016.04.012,
  13. https://doi.org/10.1016/j.molcel.2015.06.027,

📄 View Raw YAML

id: Q95QK3
gene_symbol: jmjd-3.1
product_type: PROTEIN
status: COMPLETE
taxon:
  id: NCBITaxon:6239
  label: Caenorhabditis elegans
description: JMJD-3.1 is a JmjC domain-containing lysine-specific demethylase 
  belonging to the UTX/KDM6 family that specifically demethylates H3K27me2/me3, 
  marks associated with transcriptional repression. The enzyme requires Fe(II) 
  as a cofactor for its dioxygenase activity. JMJD-3.1 functions in the nucleus 
  where it removes repressive H3K27 methylation marks at specific loci to enable
  gene activation. Unlike the related UTX-1 which is the dominant global H3K27 
  demethylase during development, JMJD-3.1 acts more locus-specifically and 
  contributes primarily to stress response pathways including the mitochondrial 
  unfolded protein response (UPRmt) and heat shock response. It is required for 
  the robust transdifferentiation of the Y rectal epithelial cell into the PDA 
  motor neuron during larval development. Overexpression of jmjd-3.1 extends 
  lifespan in a manner dependent on UPRmt components (ATFS-1, UBL-5, CLPP-1).
existing_annotations:
  - term:
      id: GO:0010468
      label: regulation of gene expression
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: JMJD-3.1 regulates gene expression by removing repressive 
        H3K27me2/me3 marks, thereby enabling transcriptional activation. This is
        well-supported by studies showing jmjd-3.1 is required for 
        stress-induced gene expression programs (UPRmt, HSR) and for gene 
        activation during transdifferentiation (PMID:25124442, PMID:27133168).
      action: ACCEPT
      reason: The IBA annotation accurately captures that jmjd-3.1 regulates 
        gene expression. As an H3K27 demethylase, its core function is to remove
        repressive chromatin marks and enable transcriptional activation of 
        specific gene sets. This is a parent term to more specific processes and
        is appropriate for the phylogenetic inference.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: a conserved H3K27me3/me2 demethylase, JMJD-3.1, and 
            the H3K4 methyltransferase Set1 complex cooperate to ensure 
            invariant transdifferentiation (Td) of postmitotic Caenorhabditis 
            elegans hindgut cells into motor neurons
        - reference_id: PMID:27133168
          supporting_text: We identify the conserved histone lysine demethylases
            jmjd-1.2/PHF8 and jmjd-3.1/JMJD3 as positive regulators of lifespan 
            in response to mitochondrial dysfunction across species
        - reference_id: file:worm/jmjd-3.1/jmjd-3.1-deep-research-falcon.md
          supporting_text: 'model: Edison Scientific Literature'
  - term:
      id: GO:0071558
      label: histone H3K27me2/H3K27me3 demethylase activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: JMJD-3.1 is a member of the UTX/KDM6 family and contains the 
        conserved JmjC catalytic domain. Experimental evidence from 
        PMID:17713478 and PMID:25124442 demonstrates H3K27me2/me3 demethylase 
        activity. Mutations in catalytic residues abolish function in 
        transdifferentiation assays (PMID:25124442).
      action: ACCEPT
      reason: This is the core molecular function of jmjd-3.1. The IBA 
        annotation is consistent with direct experimental evidence from IDA 
        annotations and the known domain architecture (JmjC domain with 
        conserved Fe-binding residues). This represents the primary enzymatic 
        activity of the protein.
      supported_by:
        - reference_id: PMID:17713478
          supporting_text: mutation of F18E9.5, a Caenorhabditis elegans JMJD3 
            orthologue, or inhibition of its expression, results in abnormal 
            gonad development
        - reference_id: PMID:25124442
          supporting_text: a conserved H3K27me3/me2 demethylase, JMJD-3.1
  - term:
      id: GO:0044666
      label: MLL3/4 complex
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: The IBA annotation infers MLL3/4 complex membership based on 
        orthology to mammalian JMJD3/KDM6B. However, in C. elegans, UTX-1 (not 
        jmjd-3.1) has been shown to associate with SET-16/MLL-like complexes. 
        The literature explicitly notes that jmjd-3.1 partners are not well 
        established and it may act more locus-specifically rather than as part 
        of large chromatin assemblies.
      action: UNDECIDED
      reason: While mammalian JMJD3/KDM6B is associated with MLL3/4 complexes, 
        direct evidence for C. elegans jmjd-3.1 membership in an equivalent 
        complex is lacking. The literature (Vandamme et al. 2012) specifically 
        found UTX-1 in complex with SET-16 but did not identify jmjd-3.1 complex
        partners. The phylogenetic inference may not hold in this case given the
        functional divergence between UTX-1 and JMJD-3 paralogs in C. elegans. 
        More biochemical evidence is needed to confirm or refute this 
        annotation.
      additional_reference_ids:
        - PMID:22570628
      supported_by:
        - reference_id: PMID:22570628
          supporting_text: Biochemical analysis identified UTX-1 as a component 
            of a complex that includes SET-16(MLL)
  - term:
      id: GO:0000978
      label: RNA polymerase II cis-regulatory region sequence-specific DNA 
        binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: This annotation suggests jmjd-3.1 has sequence-specific DNA 
        binding activity at Pol II regulatory regions. However, jmjd-3.1 is 
        recruited to chromatin through protein-protein interactions (e.g., with 
        transcription factors like UNC-3) rather than through intrinsic 
        sequence-specific DNA binding. The protein lacks recognizable 
        DNA-binding domains.
      action: REMOVE
      reason: JMJD-3.1 does not contain canonical sequence-specific DNA-binding 
        domains. While it functions at regulatory regions to demethylate H3K27, 
        it is recruited through interactions with transcription factors (e.g., 
        UNC-3 as shown in PMID:25124442) rather than through direct 
        sequence-specific DNA recognition. The chromatin DNA binding annotation 
        (GO:0031490) is more appropriate.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: phase-specific interactions with transcription 
            factors that have conserved roles in cell plasticity and terminal 
            fate selection
  - term:
      id: GO:0031490
      label: chromatin DNA binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: JMJD-3.1 functions at chromatin where it demethylates H3K27. The 
        protein requires recognition of the H3 tail for its function 
        (PMID:25124442). This general chromatin binding activity is consistent 
        with its role as a histone demethylase.
      action: ACCEPT
      reason: As a histone demethylase that acts on chromatin-bound histones, 
        jmjd-3.1 must bind to chromatin to carry out its function. The 
        annotation is appropriate and consistent with the enzymatic mechanism. 
        UniProt also notes a region required for binding and function (residues 
        418-759).
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: robust conversion requires stepwise histone-modifying
            activities, functionally partitioned into discrete phases of Td
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: Nuclear localization is well-established for jmjd-3.1 by direct 
        experimental evidence. The protein contains a region required for 
        nuclear localization (residues 369-417) and overexpressed 
        jmjd-3.1::mCherry shows diffuse nuclear localization.
      action: ACCEPT
      reason: This IEA annotation is correct and supported by direct 
        experimental evidence (IDA from PMID:25124442). Nuclear localization is 
        essential for jmjd-3.1 function as a chromatin modifier.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: functionally partitioned into discrete phases of Td 
            through nuclear degradation of JMJD-3.1
  - term:
      id: GO:0006325
      label: chromatin organization
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: As an H3K27 demethylase, jmjd-3.1 directly modifies chromatin 
        structure by removing methyl groups from histones. This alters the 
        chromatin state from repressive to permissive for transcription.
      action: ACCEPT
      reason: H3K27 demethylation directly affects chromatin organization by 
        removing repressive marks and enabling chromatin state transitions. This
        is a core aspect of jmjd-3.1 function as a histone-modifying enzyme.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: Sequential histone-modifying activities determine the
            robustness of transdifferentiation
  - term:
      id: GO:0006338
      label: chromatin remodeling
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: While jmjd-3.1 modifies chromatin through histone demethylation, 
        chromatin remodeling (GO:0006338) specifically refers to ATP-dependent 
        alteration of nucleosome structure. Histone demethylation is a distinct 
        process from ATP-dependent chromatin remodeling.
      action: MODIFY
      reason: Chromatin remodeling in GO specifically refers to ATP-dependent 
        nucleosome repositioning or eviction. JMJD-3.1 is not an ATP-dependent 
        chromatin remodeler but rather a covalent histone modifier. The more 
        appropriate term is 'histone H3-K27 demethylation' (GO:0071557) or 
        'chromatin organization' (GO:0006325).
      proposed_replacement_terms:
        - id: GO:0071557
          label: histone H3-K27 demethylation
        - id: GO:0006325
          label: chromatin organization
  - term:
      id: GO:0016491
      label: oxidoreductase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: JMJD-3.1 catalyzes an oxidative demethylation reaction using 
        Fe(II) and 2-oxoglutarate as cofactors, making it technically an 
        oxidoreductase. However, this is a very general term.
      action: ACCEPT
      reason: As a JmjC domain dioxygenase, jmjd-3.1 does have oxidoreductase 
        activity. While this is a broad parent term, it is technically correct 
        for an IEA annotation derived from keyword mapping. The more specific 
        H3K27me2/me3 demethylase activity annotation captures the precise 
        function.
  - term:
      id: GO:0032452
      label: histone demethylase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: JMJD-3.1 is a bona fide histone demethylase with specificity for 
        H3K27me2/me3. This parent term is appropriate.
      action: ACCEPT
      reason: This is a correct parent term for the more specific H3K27me2/me3 
        demethylase activity. The IEA annotation is consistent with experimental
        evidence.
      supported_by:
        - reference_id: PMID:17713478
          supporting_text: UTX and JMJD3 are histone H3K27 demethylases involved
            in HOX gene regulation and development
  - term:
      id: GO:0046872
      label: metal ion binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: JMJD-3.1 binds Fe(II) as a required cofactor for its dioxygenase 
        activity. The JmjC domain contains conserved histidine and glutamate 
        residues (H811, E813, H891) that coordinate Fe(II). Additionally, the 
        C-terminal region contains a zinc-binding site (C998, C1001, C1025, 
        C1028).
      action: ACCEPT
      reason: Metal ion binding is essential for jmjd-3.1 function. UniProt 
        annotation confirms Fe(II) as cofactor and zinc binding at the 
        C-terminus. While a more specific term like 'iron ion binding' could be 
        used, this general annotation is appropriate for an IEA.
  - term:
      id: GO:0051213
      label: dioxygenase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: The JmjC domain of jmjd-3.1 catalyzes an 
        Fe(II)/2-oxoglutarate-dependent dioxygenase reaction that demethylates 
        H3K27. This is the mechanistic basis for histone demethylation.
      action: ACCEPT
      reason: JmjC domain histone demethylases function as dioxygenases, using 
        molecular oxygen and 2-oxoglutarate in a hydroxylation reaction that 
        leads to demethylation. This is biochemically accurate for the enzymatic
        mechanism.
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:25124442
    review:
      summary: Direct observation of jmjd-3.1 localization using tagged 
        constructs showed diffuse nuclear localization. The protein contains a 
        region (residues 369-417) required for nuclear localization.
      action: ACCEPT
      reason: Nuclear localization is directly demonstrated by imaging of tagged
        jmjd-3.1 constructs. This is essential for its function as a chromatin 
        modifier acting on nuclear histones.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: functionally partitioned into discrete phases of Td 
            through nuclear degradation of JMJD-3.1
  - term:
      id: GO:0060290
      label: transdifferentiation
    evidence_type: IMP
    original_reference_id: PMID:25124442
    review:
      summary: JMJD-3.1 is required for the robust transdifferentiation of the Y
        rectal epithelial cell into the PDA motor neuron. Loss of function or 
        catalytic dead mutations disrupt this invariant cell fate conversion. 
        The demethylase activity and H3 tail recognition are required for this 
        function.
      action: ACCEPT
      reason: This is one of the best-characterized biological processes for 
        jmjd-3.1 in C. elegans. The study demonstrates cell-autonomous 
        requirement and dependence on catalytic activity. However, this 
        represents a specific developmental role rather than the core molecular 
        function of the protein.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: a conserved H3K27me3/me2 demethylase, JMJD-3.1, and 
            the H3K4 methyltransferase Set1 complex cooperate to ensure 
            invariant transdifferentiation (Td) of postmitotic Caenorhabditis 
            elegans hindgut cells into motor neurons
        - reference_id: PMID:25124442
          supporting_text: robust conversion requires stepwise histone-modifying
            activities, functionally partitioned into discrete phases of Td 
            through nuclear degradation of JMJD-3.1
  - term:
      id: GO:0071558
      label: histone H3K27me2/H3K27me3 demethylase activity
    evidence_type: IDA
    original_reference_id: PMID:25124442
    review:
      summary: The study demonstrates that jmjd-3.1 functions as an H3K27me3/me2
        demethylase in the context of transdifferentiation. Mutations in 
        catalytic residues (G888E, S903F) abolish demethylase activity and 
        function.
      action: ACCEPT
      reason: Direct experimental evidence demonstrates H3K27 demethylase 
        activity through functional assays showing that catalytic domain 
        mutations abolish the ability to promote transdifferentiation and 
        demethylate H3K27.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: a conserved H3K27me3/me2 demethylase, JMJD-3.1
  - term:
      id: GO:0071558
      label: histone H3K27me2/H3K27me3 demethylase activity
    evidence_type: IMP
    original_reference_id: PMID:25124442
    review:
      summary: Mutant phenotype analysis shows that loss of jmjd-3.1 or 
        catalytic dead mutations result in failure of transdifferentiation and 
        correlate with H3K27 methylation status.
      action: ACCEPT
      reason: IMP evidence from mutant analysis supports the demethylase 
        activity assignment. Mutations in the JmjC catalytic domain residues 
        (HME->TMG at 811-813, G888E, S903F) disrupt function consistent with 
        loss of demethylase activity.
      supported_by:
        - reference_id: PMID:25124442
          supporting_text: robust conversion requires stepwise histone-modifying
            activities, functionally partitioned into discrete phases of Td 
            through nuclear degradation of JMJD-3.1
  - term:
      id: GO:0071558
      label: histone H3K27me2/H3K27me3 demethylase activity
    evidence_type: IDA
    original_reference_id: PMID:17713478
    review:
      summary: This foundational study identified jmjd-3.1 (F18E9.5) as a C. 
        elegans ortholog of human JMJD3 and demonstrated that mutation or RNAi 
        knockdown causes developmental defects consistent with loss of H3K27 
        demethylase function.
      action: ACCEPT
      reason: This is the original study identifying jmjd-3.1 as an H3K27 
        demethylase ortholog. While the biochemical demonstration was primarily 
        done with human JMJD3, the C. elegans ortholog showed functional 
        conservation in gonad development assays.
      supported_by:
        - reference_id: PMID:17713478
          supporting_text: mutation of F18E9.5, a Caenorhabditis elegans JMJD3 
            orthologue, or inhibition of its expression, results in abnormal 
            gonad development
  - term:
      id: GO:0034620
      label: cellular response to unfolded protein
    evidence_type: IMP
    original_reference_id: PMID:27133168
    review:
      summary: JMJD-3.1 is necessary and sufficient for activation of the 
        mitochondrial unfolded protein response (UPRmt). Overexpression of 
        jmjd-3.1 induces UPRmt gene expression including hsp-6, dve-1, and 
        spg-7. The lifespan extension by jmjd-3.1 overexpression depends on 
        UPRmt components ATFS-1, UBL-5, and CLPP-1.
      action: NEW
      reason: The role of jmjd-3.1 in UPRmt activation is a major characterized 
        function not captured in the current annotation set. Reduction of 
        function of the demethylases potently suppresses longevity and UPRmt 
        induction.
      supported_by:
        - reference_id: PMID:27133168
          supporting_text: Reduction of function of the demethylases potently 
            suppresses longevity and UPR(mt) induction, while gain of function 
            is sufficient to extend lifespan in a UPR(mt)-dependent manner
  - term:
      id: GO:0008340
      label: determination of adult lifespan
    evidence_type: IMP
    original_reference_id: PMID:27133168
    review:
      summary: JMJD-3.1 regulates lifespan in C. elegans. Overexpression extends
        lifespan while knockdown reduces lifespan and suppresses mitochondrial 
        stress-induced longevity. This is an evolutionarily conserved role as 
        mammalian orthologs also regulate longevity.
      action: NEW
      reason: Lifespan regulation is a well-documented phenotype for jmjd-3.1, 
        mediated through its effects on stress response gene expression and 
        proteostasis.
      supported_by:
        - reference_id: PMID:27133168
          supporting_text: We identify the conserved histone lysine demethylases
            jmjd-1.2/PHF8 and jmjd-3.1/JMJD3 as positive regulators of lifespan 
            in response to mitochondrial dysfunction across species
        - reference_id: PMID:27133168
          supporting_text: Reduction of function of the demethylases potently 
            suppresses longevity and UPR(mt) induction, while gain of function 
            is sufficient to extend lifespan in a UPR(mt)-dependent manner
references:
  - id: GO_REF:0000033
    title: Annotation inferences using phylogenetic trees
    findings:
      - statement: IBA annotations based on orthology to mammalian KDM6B/JMJD3
  - id: GO_REF:0000043
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword 
      mapping
    findings:
      - statement: Keyword-based IEA annotations for oxidoreductase, metal 
          binding, dioxygenase
  - id: GO_REF:0000044
    title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular 
      Location vocabulary mapping
    findings:
      - statement: Nuclear localization from UniProt subcellular location
  - id: GO_REF:0000117
    title: Electronic Gene Ontology annotations created by ARBA machine learning
      models
    findings:
      - statement: Histone demethylase activity from ARBA predictions
  - id: GO_REF:0000120
    title: Combined Automated Annotation using Multiple IEA Methods
    findings:
      - statement: Chromatin remodeling annotation (potentially over-annotated)
  - id: PMID:17713478
    title: UTX and JMJD3 are histone H3K27 demethylases involved in HOX gene 
      regulation and development.
    findings:
      - statement: First identification of jmjd-3.1 (F18E9.5) as C. elegans 
          JMJD3 ortholog
        supporting_text: mutation of F18E9.5, a Caenorhabditis elegans JMJD3 
          orthologue
      - statement: RNAi knockdown causes abnormal gonad development
        supporting_text: mutation of F18E9.5, a Caenorhabditis elegans JMJD3 
          orthologue, or inhibition of its expression, results in abnormal gonad
          development
      - statement: Established H3K27 demethylase activity for JMJD3 family
        supporting_text: UTX and JMJD3 are histone H3K27 demethylases involved 
          in HOX gene regulation and development
  - id: PMID:25124442
    title: Transdifferentiation. Sequential histone-modifying activities 
      determine the robustness of transdifferentiation.
    findings:
      - statement: Direct demonstration of H3K27me3/me2 demethylase activity
        supporting_text: a conserved H3K27me3/me2 demethylase, JMJD-3.1
      - statement: Required for Y-to-PDA transdifferentiation
        supporting_text: JMJD-3.1, and the H3K4 methyltransferase Set1 complex 
          cooperate to ensure invariant transdifferentiation (Td) of postmitotic
          Caenorhabditis elegans hindgut cells into motor neurons
      - statement: Functions cell-autonomously with catalytic activity required
        supporting_text: robust conversion requires stepwise histone-modifying 
          activities
      - statement: Nuclear localization demonstrated
        supporting_text: functionally partitioned into discrete phases of Td 
          through nuclear degradation of JMJD-3.1
      - statement: Interacts with transcription factors including UNC-3
        supporting_text: phase-specific interactions with transcription factors 
          that have conserved roles in cell plasticity and terminal fate 
          selection
  - id: PMID:22570628
    title: The C. elegans H3K27 demethylase UTX-1 is essential for normal 
      development, independent of its enzymatic activity.
    findings:
      - statement: UTX-1 is dominant developmental H3K27 demethylase
        supporting_text: UTX-1 regulates global levels of H3K27me2/3 in C. 
          elegans
      - statement: JMJD-3.1 paralogs contribute to locus-specific H3K27 
          demethylation
        supporting_text: the loss of utx-1 leads to a more severe phenotype than
          the loss of jmjd-3.1, which only influences gonadal processes at high 
          temperature and moderately reduces fertility
      - statement: Triple jmjd-3.1/3.2/3.3 deletion increases global H3K27me3
        supporting_text: We generated mutant animals carrying mutations in all 
          three JMJD3-like genes and, unexpectedly, we did not detect any 
          additional phenotypes in the triple mutants
      - statement: UTX-1 associates with SET-16/MLL-like complexes
        supporting_text: Biochemical analysis identified UTX-1 as a component of
          a complex that includes SET-16(MLL)
  - id: PMID:27133168
    title: Two Conserved Histone Demethylases Regulate Mitochondrial 
      Stress-Induced Longevity.
    findings:
      - statement: jmjd-3.1 necessary and sufficient for UPRmt activation
        supporting_text: Reduction of function of the demethylases potently 
          suppresses longevity and UPR(mt) induction, while gain of function is 
          sufficient to extend lifespan in a UPR(mt)-dependent manner
      - statement: jmjd-3.1 is a positive regulator of lifespan
        supporting_text: We identify the conserved histone lysine demethylases 
          jmjd-1.2/PHF8 and jmjd-3.1/JMJD3 as positive regulators of lifespan in
          response to mitochondrial dysfunction across species
      - statement: Evolutionarily conserved role in longevity signaling
        supporting_text: These findings illustrate an evolutionary conserved 
          epigenetic mechanism that determines the rate of aging downstream of 
          mitochondrial perturbations
  - id: file:worm/jmjd-3.1/jmjd-3.1-deep-research-falcon.md
    title: Deep research report on jmjd-3.1
    findings: []
core_functions:
  - description: JMJD-3.1 is a JmjC domain-containing dioxygenase that 
      specifically demethylates H3K27me2 and H3K27me3 marks. This is supported 
      by conserved JmjC domain with Fe(II)-binding catalytic residues and 
      orthology to characterized mammalian JMJD3/KDM6B. Unlike UTX-1, jmjd-3.1 
      acts more at specific loci rather than globally.
    molecular_function:
      id: GO:0071558
      label: histone H3K27me2/H3K27me3 demethylase activity
    locations:
      - id: GO:0005634
        label: nucleus
    directly_involved_in:
      - id: GO:0006325
        label: chromatin organization
      - id: GO:0010468
        label: regulation of gene expression
  - description: JMJD-3.1 is a key regulator of the mitochondrial UPR. Gain of 
      function is sufficient to extend lifespan in a UPRmt-dependent manner. The
      lifespan-extending effects of jmjd-3.1 depend on UPRmt components ATFS-1, 
      UBL-5, and CLPP-1.
    molecular_function:
      id: GO:0071558
      label: histone H3K27me2/H3K27me3 demethylase activity
    locations:
      - id: GO:0005634
        label: nucleus
    directly_involved_in:
      - id: GO:0034620
        label: cellular response to unfolded protein
      - id: GO:0008340
        label: determination of adult lifespan
proposed_new_terms: []
suggested_questions:
  - question: Does jmjd-3.1 function as part of a larger chromatin-modifying 
      complex in C. elegans, similar to mammalian JMJD3 in MLL3/4 complexes? 
      While UTX-1 associates with SET-16/MLL-like complexes, jmjd-3.1 protein 
      partners remain poorly defined. Understanding whether it acts alone or in 
      a complex would clarify its recruitment mechanism.
  - question: What is the genomic targeting mechanism for jmjd-3.1 at 
      stress-responsive loci? JMJD-3.1 appears to act at specific loci rather 
      than globally. The interaction with UNC-3 provides one example, but 
      genome-wide ChIP studies would reveal the full scope of its targets.
  - question: How do the three JMJD3 paralogs (jmjd-3.1, jmjd-3.2, jmjd-3.3) 
      partition their functions? Triple deletion shows no additional phenotypes 
      beyond jmjd-3.1 single mutants, suggesting potential redundancy, but 
      individual paralogs may have distinct stress-specific or tissue-specific 
      roles.
suggested_experiments:
  - description: ChIP-seq for jmjd-3.1 under basal and stress conditions to map 
      genome-wide binding sites and correlate with H3K27me3 changes
  - description: Co-immunoprecipitation/mass spectrometry of jmjd-3.1 to 
      identify protein interaction partners and potential complex membership
  - description: Single-cell transcriptomics during Y-to-PDA 
      transdifferentiation in jmjd-3.1 mutants to identify specific gene targets
      deregulated during cell fate conversion
tags:
  - caeel-upr-stress