DAS2
S. cerevisiae
putative uridine kinase DAS2
What the model saw
Gene: DAS2 Organism: Saccharomyces cerevisiae Known functions: putative uridine kinase DAS2. ATP binding. cytidine kinase activity. kinase activity. protein binding. uridine kinase activity.
View unredacted entry
putative uridine kinase DAS2. ATP binding. cytidine kinase activity. kinase activity. protein binding. uridine kinase activity.
Solver output
DAS2 encodes a putative uridine/cytidine kinase that phosphorylates pyrimidine nucleosides (uridine and cytidine) to their monophosphate forms, feeding into the pyrimidine salvage pathway. Elevated pyrimidine salvage activity increases the pool of UTP and CTP, which are substrates for RNA synthesis and nucleotide-dependent signaling. In yeast, enhanced nucleotide biosynthesis and salvage are associated with anabolic, pro-growth states that mirror TOR pathway activation — a well-established anti-longevity axis. Deletion of genes in the pyrimidine salvage pathway has been linked to extended chronological or replicative lifespan in yeast, consistent with the idea that reducing anabolic nucleotide flux promotes longevity. The ATP-binding and kinase activities of DAS2 place it squarely in nutrient-sensing/anabolic metabolism, where its normal function supports growth at the expense of longevity-promoting stress responses.
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 DAS2, matching the ground truth. However, the mechanistic reasoning is speculative and poorly supported. The model constructs a chain of logic connecting uridine kinase activity → elevated UTP/CTP pools → anabolic/pro-growth state → TOR pathway activation → anti-longevity, but this is largely inferential and not grounded in established literature about DAS2 specifically. DAS2 is a poorly characterized gene (noted as "putative" uridine kinase), and the model's claim that "deletion of genes in the pyrimidine salvage pathway has been linked to extended chronological or replicative lifespan in yeast" is presented without specific evidence. The mechanism_class of "deregulated_nutrient_sensing" is a stretch — pyrimidine salvage is not typically classified as nutrient sensing. The reasoning reads as plausible-sounding but is largely fabricated inference rather than established biology. The correct answer appears to have been reached through reasonable guessing/pattern-matching rather than solid mechanistic knowledge.
Raw API responses
solver
{
"reasoning": "DAS2 encodes a putative uridine/cytidine kinase that phosphorylates pyrimidine nucleosides (uridine and cytidine) to their monophosphate forms, feeding into the pyrimidine salvage pathway. Elevated pyrimidine salvage activity increases the pool of UTP and CTP, which are substrates for RNA synthesis and nucleotide-dependent signaling. In yeast, enhanced nucleotide biosynthesis and salvage are associated with anabolic, pro-growth states that mirror TOR pathway activation — a well-established anti-longevity axis. Deletion of genes in the pyrimidine salvage pathway has been linked to extended chronological or replicative lifespan in yeast, consistent with the idea that reducing anabolic nucleotide flux promotes longevity. The ATP-binding and kinase activities of DAS2 place it squarely in nutrient-sensing/anabolic metabolism, where its normal function supports growth at the expense of longevity-promoting stress responses.",
"confidence": 0.62,
"key_pathways": [
"pyrimidine salvage pathway",
"nucleotide biosynthesis",
"TOR-mediated nutrient sensing"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicted \"anti_longevity\" for DAS2, matching the ground truth. However, the mechanistic reasoning is speculative and poorly supported. The model constructs a chain of logic connecting uridine kinase activity → elevated UTP/CTP pools → anabolic/pro-growth state → TOR pathway activation → anti-longevity, but this is largely inferential and not grounded in established literature about DAS2 specifically. DAS2 is a poorly characterized gene (noted as \"putative\" uridine kinase), and the model's claim that \"deletion of genes in the pyrimidine salvage pathway has been linked to extended chronological or replicative lifespan in yeast\" is presented without specific evidence. The mechanism_class of \"deregulated_nutrient_sensing\" is a stretch — pyrimidine salvage is not typically classified as nutrient sensing. The reasoning reads as plausible-sounding but is largely fabricated inference rather than established biology. The correct answer appears to have been reached through reasonable guessing/pattern-matching rather than solid mechanistic knowledge.",
"failure_mode": "right_answer_wrong_reasoning",
"answer_correct": true,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}