uck2
S. pombe
uracil phosphoribosyltransferase
What the model saw
Gene: uck2 Organism: Schizosaccharomyces pombe Known functions: uracil phosphoribosyltransferase. uracil phosphoribosyltransferase activity.
View unredacted entry
uracil phosphoribosyltransferase. uracil phosphoribosyltransferase activity.
Solver output
Uracil phosphoribosyltransferase (UPRTase) catalyzes the conversion of uracil and PRPP to UMP, a key step in the pyrimidine salvage pathway. Efficient nucleotide salvage reduces the energetic cost of de novo pyrimidine biosynthesis and helps maintain balanced nucleotide pools, which is important for accurate DNA replication and RNA synthesis. Dysregulation of nucleotide pools is associated with increased mutagenesis and genomic instability; thus, proper pyrimidine recycling via uck2 supports genome integrity. In S. pombe, pyrimidine salvage also connects to broader metabolic homeostasis, and adequate UMP supply supports RNA metabolism and ribosome biogenesis. While the direct evidence linking UPRTase activity to lifespan extension is limited, the maintenance of nucleotide balance and reduction of replication stress generally favor 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 while the ground truth is anti_longevity. The model constructed a plausible-sounding but ultimately incorrect mechanistic argument about nucleotide pool homeostasis and genome integrity supporting longevity. In reality, uck2 in S. pombe is anti-longevity, meaning its deletion or loss likely extends lifespan. The model's reasoning about pyrimidine salvage supporting longevity is speculative and not grounded in actual experimental evidence for this gene. The confidence of 0.55 is relatively low, but the model still committed to the wrong answer. The mechanistic reasoning is also incorrect since it doesn't account for why uck2 activity would be detrimental to longevity (e.g., possibly through excessive UMP production, altered metabolic flux, or other mechanisms that reduce lifespan).
Raw API responses
solver
{
"reasoning": "Uracil phosphoribosyltransferase (UPRTase) catalyzes the conversion of uracil and PRPP to UMP, a key step in the pyrimidine salvage pathway. Efficient nucleotide salvage reduces the energetic cost of de novo pyrimidine biosynthesis and helps maintain balanced nucleotide pools, which is important for accurate DNA replication and RNA synthesis. Dysregulation of nucleotide pools is associated with increased mutagenesis and genomic instability; thus, proper pyrimidine recycling via uck2 supports genome integrity. In S. pombe, pyrimidine salvage also connects to broader metabolic homeostasis, and adequate UMP supply supports RNA metabolism and ribosome biogenesis. While the direct evidence linking UPRTase activity to lifespan extension is limited, the maintenance of nucleotide balance and reduction of replication stress generally favor longevity.",
"confidence": 0.55,
"key_pathways": [
"pyrimidine salvage pathway",
"nucleotide pool homeostasis",
"genomic stability maintenance"
],
"mechanism_class": "other",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity while the ground truth is anti_longevity. The model constructed a plausible-sounding but ultimately incorrect mechanistic argument about nucleotide pool homeostasis and genome integrity supporting longevity. In reality, uck2 in S. pombe is anti-longevity, meaning its deletion or loss likely extends lifespan. The model's reasoning about pyrimidine salvage supporting longevity is speculative and not grounded in actual experimental evidence for this gene. The confidence of 0.55 is relatively low, but the model still committed to the wrong answer. The mechanistic reasoning is also incorrect since it doesn't account for why uck2 activity would be detrimental to longevity (e.g., possibly through excessive UMP production, altered metabolic flux, or other mechanisms that reduce lifespan).",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}