dod-18
C. elegans
Nucleotide PPase
What the model saw
Gene: dod-18 Organism: Caenorhabditis elegans Known functions: Nucleotide PPase. nucleoside triphosphate diphosphatase activity.
View unredacted entry
Nucleotide PPase. nucleoside triphosphate diphosphatase activity.
Solver output
dod-18 encodes a nucleotide pyrophosphatase/phosphodiesterase (NTPDase) with nucleoside triphosphate diphosphatase activity. This class of enzymes hydrolyzes non-canonical or oxidized nucleoside triphosphates (e.g., 8-oxo-dGTP, dUTP) from the nucleotide pool, preventing their misincorporation into DNA. By sanitizing the nucleotide pool, dod-18 reduces replication errors and DNA damage, thereby opposing genomic instability—a primary hallmark of aging. In C. elegans, the "dod" (downstream of daf-16) gene family is regulated by the DAF-16/FOXO transcription factor, linking this activity to the insulin/IGF-1 longevity pathway. Maintenance of nucleotide pool fidelity is a conserved mechanism that supports genome integrity and extends healthspan.
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 nucleotide pool sanitization and genomic stability sounds plausible on the surface, but it leads to the wrong conclusion. The model assumed that because dod-18 has nucleotide diphosphatase activity it would protect against DNA damage and extend lifespan, but the actual GenAge classification is anti_longevity, meaning loss of dod-18 likely extends lifespan (or overexpression shortens it). The model correctly identified the gene family context (dod = downstream of daf-16) and the enzymatic function, but drew the wrong conclusion about the direction of longevity influence. The confidence of 0.55 is relatively low, which is appropriate given the uncertainty, but the prediction is still wrong. The mechanistic reasoning is also incorrect in its directionality.
Raw API responses
solver
{
"reasoning": "dod-18 encodes a nucleotide pyrophosphatase/phosphodiesterase (NTPDase) with nucleoside triphosphate diphosphatase activity. This class of enzymes hydrolyzes non-canonical or oxidized nucleoside triphosphates (e.g., 8-oxo-dGTP, dUTP) from the nucleotide pool, preventing their misincorporation into DNA. By sanitizing the nucleotide pool, dod-18 reduces replication errors and DNA damage, thereby opposing genomic instability—a primary hallmark of aging. In C. elegans, the \"dod\" (downstream of daf-16) gene family is regulated by the DAF-16/FOXO transcription factor, linking this activity to the insulin/IGF-1 longevity pathway. Maintenance of nucleotide pool fidelity is a conserved mechanism that supports genome integrity and extends healthspan.",
"confidence": 0.55,
"key_pathways": [
"nucleotide pool sanitization",
"DAF-16/FOXO insulin-IGF-1 signaling",
"DNA damage prevention"
],
"mechanism_class": "genomic_instability",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about nucleotide pool sanitization and genomic stability sounds plausible on the surface, but it leads to the wrong conclusion. The model assumed that because dod-18 has nucleotide diphosphatase activity it would protect against DNA damage and extend lifespan, but the actual GenAge classification is anti_longevity, meaning loss of dod-18 likely extends lifespan (or overexpression shortens it). The model correctly identified the gene family context (dod = downstream of daf-16) and the enzymatic function, but drew the wrong conclusion about the direction of longevity influence. The confidence of 0.55 is relatively low, which is appropriate given the uncertainty, but the prediction is still wrong. The mechanistic reasoning is also incorrect in its directionality.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}