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).
| 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).
Proposed replacements:
histone H3-K27 demethylation
chromatin organization
|
|
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
|
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.
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
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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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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.
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
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.
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.
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.
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
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
(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.
(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.
(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.
(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.
(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.
(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.
(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.
(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.
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