mes-2
C. elegans
Histone-lysine N-methyltransferase mes-2
What the model saw
Gene: mes-2 Organism: Caenorhabditis elegans Known functions: Histone-lysine N-methyltransferase mes-2. chromatin binding. histone H3K27 methyltransferase activity. histone H3K27 trimethyltransferase activity. histone methyltransferase activity. protein binding.
View unredacted entry
Histone-lysine N-methyltransferase mes-2. chromatin binding. histone H3K27 methyltransferase activity. histone H3K27 trimethyltransferase activity. histone methyltransferase activity. protein binding.
Solver output
mes-2 is the C. elegans ortholog of the Polycomb Repressive Complex 2 (PRC2) catalytic subunit EZH2, responsible for mono-, di-, and trimethylation of histone H3 at lysine 27 (H3K27me3). H3K27me3 is a repressive chromatin mark that silences developmental genes and transposable elements, maintaining transcriptional fidelity and genome integrity across aging. In C. elegans, PRC2-mediated H3K27me3 has been shown to be required for normal lifespan, as loss of mes-2 leads to derepression of germline and somatic genes, disrupted chromatin compaction, and accelerated aging phenotypes. The maintenance of repressive histone methylation marks by mes-2/PRC2 counteracts the age-associated global loss of H3K27me3 that contributes to epigenetic drift and transcriptional noise. This places mes-2 firmly within the epigenetic alterations hallmark of aging, acting through the Polycomb silencing pathway to preserve chromatin states that support longevity.
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 predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning is internally consistent but factually incorrect regarding the actual experimental findings in C. elegans. While the model correctly identifies mes-2 as the PRC2 catalytic subunit responsible for H3K27me3, it incorrectly claims that loss of mes-2 leads to "accelerated aging phenotypes." In reality, mes-2 is anti-longevity, meaning its loss (or reduction) extends lifespan rather than shortening it. The model fabricated the claim that "loss of mes-2 leads to... accelerated aging phenotypes" to support its incorrect conclusion. The actual literature shows that reducing PRC2/mes-2 activity can extend lifespan in C. elegans, making it anti-longevity (its activity opposes longevity). The model was confident (0.78) in the wrong direction and constructed plausible-sounding but incorrect mechanistic reasoning to support its wrong answer.
Raw API responses
solver
{
"reasoning": "mes-2 is the C. elegans ortholog of the Polycomb Repressive Complex 2 (PRC2) catalytic subunit EZH2, responsible for mono-, di-, and trimethylation of histone H3 at lysine 27 (H3K27me3). H3K27me3 is a repressive chromatin mark that silences developmental genes and transposable elements, maintaining transcriptional fidelity and genome integrity across aging. In C. elegans, PRC2-mediated H3K27me3 has been shown to be required for normal lifespan, as loss of mes-2 leads to derepression of germline and somatic genes, disrupted chromatin compaction, and accelerated aging phenotypes. The maintenance of repressive histone methylation marks by mes-2/PRC2 counteracts the age-associated global loss of H3K27me3 that contributes to epigenetic drift and transcriptional noise. This places mes-2 firmly within the epigenetic alterations hallmark of aging, acting through the Polycomb silencing pathway to preserve chromatin states that support longevity.",
"confidence": 0.78,
"key_pathways": [
"Polycomb Repressive Complex 2 (PRC2) H3K27 methylation",
"Chromatin silencing / transcriptional repression",
"Epigenetic maintenance of gene expression fidelity"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning is internally consistent but factually incorrect regarding the actual experimental findings in C. elegans. While the model correctly identifies mes-2 as the PRC2 catalytic subunit responsible for H3K27me3, it incorrectly claims that loss of mes-2 leads to \"accelerated aging phenotypes.\" In reality, mes-2 is anti-longevity, meaning its loss (or reduction) extends lifespan rather than shortening it. The model fabricated the claim that \"loss of mes-2 leads to... accelerated aging phenotypes\" to support its incorrect conclusion. The actual literature shows that reducing PRC2/mes-2 activity can extend lifespan in C. elegans, making it anti-longevity (its activity opposes longevity). The model was confident (0.78) in the wrong direction and constructed plausible-sounding but incorrect mechanistic reasoning to support its wrong answer.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}