AhcyL2
D. melanogaster
Adenosylhomocysteinase like 2
What the model saw
Gene: AhcyL2 Organism: Drosophila melanogaster Known functions: Adenosylhomocysteinase like 2. adenosylhomocysteinase like 2. adenosylhomocysteinase activity.
View unredacted entry
Adenosylhomocysteinase like 2. adenosylhomocysteinase like 2. adenosylhomocysteinase activity.
Solver output
Adenosylhomocysteinase (AHCY) catalyzes the hydrolysis of S-adenosylhomocysteine (SAH) to adenosine and homocysteine, a critical step in the methionine cycle. By removing SAH — a potent product inhibitor of S-adenosylmethionine (SAM)-dependent methyltransferases — AHCY activity maintains the SAM:SAH ratio and sustains methylation capacity for DNA, RNA, and histone methylation reactions. Proper epigenetic methylation patterning is essential for gene regulation during aging, and disruption of the methionine cycle is associated with accelerated aging phenotypes. In model organisms including Drosophila, methionine restriction and modulation of one-carbon/methionine metabolism extend lifespan, suggesting that enzymes supporting flux through this pathway (including SAH clearance) are pro-longevity. AhcyL2 as an AHCY-like enzyme likely supports methylation homeostasis, thereby preserving epigenetic integrity and opposing age-related epigenetic drift.
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 about AHCY's role in the methionine cycle and SAH hydrolysis is biochemically sound in general terms, but it incorrectly extrapolated that maintaining methylation homeostasis would be pro-longevity. In reality, AhcyL2 is anti-longevity in Drosophila, meaning its activity (or overexpression) reduces lifespan, or its loss extends lifespan. The model's logic that SAH clearance supports methylation and thus longevity is plausible but wrong for this specific gene. The model also conflated methionine restriction (which extends lifespan) with the activity of enzymes in the methionine cycle — these can have opposite effects. The confidence of 0.62 is moderate but still leans toward the wrong answer. The reasoning quality is moderate — it shows good biochemical knowledge but fails to consider that excessive methylation or other consequences of AHCY-like activity could be detrimental to longevity.
Raw API responses
solver
{
"reasoning": "Adenosylhomocysteinase (AHCY) catalyzes the hydrolysis of S-adenosylhomocysteine (SAH) to adenosine and homocysteine, a critical step in the methionine cycle. By removing SAH — a potent product inhibitor of S-adenosylmethionine (SAM)-dependent methyltransferases — AHCY activity maintains the SAM:SAH ratio and sustains methylation capacity for DNA, RNA, and histone methylation reactions. Proper epigenetic methylation patterning is essential for gene regulation during aging, and disruption of the methionine cycle is associated with accelerated aging phenotypes. In model organisms including Drosophila, methionine restriction and modulation of one-carbon/methionine metabolism extend lifespan, suggesting that enzymes supporting flux through this pathway (including SAH clearance) are pro-longevity. AhcyL2 as an AHCY-like enzyme likely supports methylation homeostasis, thereby preserving epigenetic integrity and opposing age-related epigenetic drift.",
"confidence": 0.62,
"key_pathways": [
"methionine cycle / one-carbon metabolism",
"SAM-dependent methylation (DNA, histone, RNA)",
"epigenetic regulation of gene expression"
],
"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 about AHCY's role in the methionine cycle and SAH hydrolysis is biochemically sound in general terms, but it incorrectly extrapolated that maintaining methylation homeostasis would be pro-longevity. In reality, AhcyL2 is anti-longevity in Drosophila, meaning its activity (or overexpression) reduces lifespan, or its loss extends lifespan. The model's logic that SAH clearance supports methylation and thus longevity is plausible but wrong for this specific gene. The model also conflated methionine restriction (which extends lifespan) with the activity of enzymes in the methionine cycle — these can have opposite effects. The confidence of 0.62 is moderate but still leans toward the wrong answer. The reasoning quality is moderate — it shows good biochemical knowledge but fails to consider that excessive methylation or other consequences of AHCY-like activity could be detrimental to longevity.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}