set-4
C. elegans
Histone-lysine N-methyltransferase Suv4-20
What the model saw
Gene: set-4 Organism: Caenorhabditis elegans Known functions: Histone-lysine N-methyltransferase Suv4-20. histone H4K20 methyltransferase activity. histone H4K20me methyltransferase activity.
View unredacted entry
Histone-lysine N-methyltransferase Suv4-20. histone H4K20 methyltransferase activity. histone H4K20me methyltransferase activity.
Solver output
SET-4 is the C. elegans ortholog of mammalian SUV4-20H, a histone H4K20 methyltransferase responsible for mono-, di-, and trimethylation of histone H4 at lysine 20 (H4K20me1/2/3). H4K20 trimethylation (H4K20me3) is a repressive chromatin mark associated with constitutive heterochromatin compaction and DNA damage response. In C. elegans, loss of set-4 has been shown to extend lifespan, indicating that its normal activity is detrimental to longevity. Elevated H4K20me3 levels promote chromatin compaction and transcriptional silencing of genes involved in stress response and longevity pathways, and H4K20me3 accumulates with age as part of the epigenetic drift associated with aging. By driving heterochromatin formation and potentially suppressing expression of pro-longevity genes, SET-4 activity opposes lifespan extension.
GenAge curators classify each gene's normal function as promoting (Pro-Longevity) or opposing (Anti-Longevity) longevity, based on synthesis across studies. Loss-of-function effects can vary from this depending on the manipulation.
Advisor judgment
The model correctly predicted anti_longevity for set-4 in C. elegans. The mechanistic reasoning is accurate and well-supported: SET-4 is the C. elegans SUV4-20H ortholog responsible for H4K20 methylation, and loss of set-4 extends lifespan, making it anti-longevity. The model correctly identifies the epigenetic mechanism involving H4K20me3-driven heterochromatin compaction and suppression of pro-longevity gene expression. The confidence level of 0.72 is appropriate given the specificity of the knowledge required.
Raw API responses
solver
{
"reasoning": "SET-4 is the C. elegans ortholog of mammalian SUV4-20H, a histone H4K20 methyltransferase responsible for mono-, di-, and trimethylation of histone H4 at lysine 20 (H4K20me1/2/3). H4K20 trimethylation (H4K20me3) is a repressive chromatin mark associated with constitutive heterochromatin compaction and DNA damage response. In C. elegans, loss of set-4 has been shown to extend lifespan, indicating that its normal activity is detrimental to longevity. Elevated H4K20me3 levels promote chromatin compaction and transcriptional silencing of genes involved in stress response and longevity pathways, and H4K20me3 accumulates with age as part of the epigenetic drift associated with aging. By driving heterochromatin formation and potentially suppressing expression of pro-longevity genes, SET-4 activity opposes lifespan extension.",
"confidence": 0.72,
"key_pathways": [
"H4K20 methylation / heterochromatin compaction",
"epigenetic regulation of stress response genes",
"chromatin aging and transcriptional silencing"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicted anti_longevity for set-4 in C. elegans. The mechanistic reasoning is accurate and well-supported: SET-4 is the C. elegans SUV4-20H ortholog responsible for H4K20 methylation, and loss of set-4 extends lifespan, making it anti-longevity. The model correctly identifies the epigenetic mechanism involving H4K20me3-driven heterochromatin compaction and suppression of pro-longevity gene expression. The confidence level of 0.72 is appropriate given the specificity of the knowledge required.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 5,
"ground_truth_questionable": false
}