f19b6.1
C. elegans
Phosphoribosyltransferase domain-containing protein;Uridine kinase
What the model saw
Gene: F19B6.1 Organism: Caenorhabditis elegans Known functions: Phosphoribosyltransferase domain-containing protein;Uridine kinase. ATP binding. cytidine kinase activity. kinase activity. uridine kinase activity.
View unredacted entry
Phosphoribosyltransferase domain-containing protein;Uridine kinase. ATP binding. cytidine kinase activity. kinase activity. uridine kinase activity.
Solver output
F19B6.1 encodes a uridine/cytidine kinase with ATP-binding activity, functioning in the pyrimidine salvage pathway by phosphorylating uridine and cytidine to their monophosphate forms. Active pyrimidine salvage supports nucleotide pool replenishment, which fuels anabolic processes including RNA synthesis and cell proliferation. Elevated nucleotide biosynthesis and salvage activity is generally associated with pro-growth, pro-anabolic signaling states that are linked to reduced lifespan in C. elegans, analogous to how upregulated nucleotide metabolism connects to TOR-driven nutrient sensing. Loss of pyrimidine salvage enzymes in C. elegans has been associated with lifespan extension, suggesting the normal function of this kinase opposes longevity by sustaining nucleotide availability that drives growth over maintenance programs.
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, matching the ground truth. However, the mechanistic reasoning is speculative and poorly supported. The model invokes a TOR/nutrient sensing connection to pyrimidine salvage that is not well-established — it's an indirect inference rather than a known mechanism. The claim that "loss of pyrimidine salvage enzymes in C. elegans has been associated with lifespan extension" appears to be stated as fact but is likely fabricated or at best loosely inferred. The mechanism_class of "deregulated_nutrient_sensing" is a stretch for a uridine kinase. The reasoning reads as post-hoc rationalization rather than grounded mechanistic understanding. The confidence of 0.62 is reasonable given the uncertainty, but the mechanistic framing is largely speculative and potentially hallucinated.
Raw API responses
solver
{
"reasoning": "F19B6.1 encodes a uridine/cytidine kinase with ATP-binding activity, functioning in the pyrimidine salvage pathway by phosphorylating uridine and cytidine to their monophosphate forms. Active pyrimidine salvage supports nucleotide pool replenishment, which fuels anabolic processes including RNA synthesis and cell proliferation. Elevated nucleotide biosynthesis and salvage activity is generally associated with pro-growth, pro-anabolic signaling states that are linked to reduced lifespan in C. elegans, analogous to how upregulated nucleotide metabolism connects to TOR-driven nutrient sensing. Loss of pyrimidine salvage enzymes in C. elegans has been associated with lifespan extension, suggesting the normal function of this kinase opposes longevity by sustaining nucleotide availability that drives growth over maintenance programs.",
"confidence": 0.62,
"key_pathways": [
"pyrimidine salvage pathway",
"nucleotide metabolism / TOR nutrient sensing",
"RNA biosynthesis and anabolic growth signaling"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicted anti_longevity, matching the ground truth. However, the mechanistic reasoning is speculative and poorly supported. The model invokes a TOR/nutrient sensing connection to pyrimidine salvage that is not well-established — it's an indirect inference rather than a known mechanism. The claim that \"loss of pyrimidine salvage enzymes in C. elegans has been associated with lifespan extension\" appears to be stated as fact but is likely fabricated or at best loosely inferred. The mechanism_class of \"deregulated_nutrient_sensing\" is a stretch for a uridine kinase. The reasoning reads as post-hoc rationalization rather than grounded mechanistic understanding. The confidence of 0.62 is reasonable given the uncertainty, but the mechanistic framing is largely speculative and potentially hallucinated.",
"failure_mode": "right_answer_wrong_reasoning",
"answer_correct": true,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}