otc
D. melanogaster
ornithine transcarbamylase
What the model saw
Gene: OTC Organism: Drosophila melanogaster Known functions: ornithine transcarbamylase. ornithine transcarbamylase, mitochondrial. amino acid binding. carboxyl- or carbamoyltransferase activity. identical protein binding. ornithine carbamoyltransferase activity. phosphate ion binding. phospholipid binding.
View unredacted entry
ornithine transcarbamylase. ornithine transcarbamylase, mitochondrial. amino acid binding. carboxyl- or carbamoyltransferase activity. identical protein binding. ornithine carbamoyltransferase activity. phosphate ion binding. phospholipid binding.
Solver output
Ornithine transcarbamylase (OTC) catalyzes the conversion of ornithine and carbamoyl phosphate to citrulline, a key step in the urea cycle and arginine biosynthesis. In Drosophila, this mitochondrial enzyme sits at the intersection of amino acid catabolism and nitrogen disposal, directly regulating arginine and polyamine availability. Arginine is a precursor to polyamines (via ornithine decarboxylase) and to nitric oxide, both of which influence aging trajectories. Efficient nitrogen metabolism through OTC activity reduces toxic ammonia accumulation and supports proteostasis. Furthermore, the urea/arginine cycle interfaces with TOR signaling, as arginine is a direct activator of mTORC1; proper OTC-mediated flux through this pathway helps modulate nutrient sensing and prevent hyperactivation of anabolic signaling that accelerates aging. Loss of OTC function in model organisms is associated with metabolic stress and reduced fitness, supporting a pro-longevity role for its normal activity.
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 pro_longevity for OTC in Drosophila melanogaster. The mechanistic reasoning is plausible and well-constructed, covering OTC's role in the urea cycle/arginine biosynthesis, nitrogen disposal, polyamine metabolism, and mTORC1 nutrient sensing via arginine. The connection between OTC activity and mTOR signaling through arginine availability is a reasonable mechanistic link. The reasoning is somewhat speculative (as is typical for these predictions), but it is internally consistent and biologically sound. Confidence of 0.65 is appropriately calibrated. Minor deduction: the model doesn't cite specific Drosophila experimental evidence for OTC's pro-longevity role, relying more on general metabolic reasoning.
Raw API responses
solver
{
"reasoning": "Ornithine transcarbamylase (OTC) catalyzes the conversion of ornithine and carbamoyl phosphate to citrulline, a key step in the urea cycle and arginine biosynthesis. In Drosophila, this mitochondrial enzyme sits at the intersection of amino acid catabolism and nitrogen disposal, directly regulating arginine and polyamine availability. Arginine is a precursor to polyamines (via ornithine decarboxylase) and to nitric oxide, both of which influence aging trajectories. Efficient nitrogen metabolism through OTC activity reduces toxic ammonia accumulation and supports proteostasis. Furthermore, the urea/arginine cycle interfaces with TOR signaling, as arginine is a direct activator of mTORC1; proper OTC-mediated flux through this pathway helps modulate nutrient sensing and prevent hyperactivation of anabolic signaling that accelerates aging. Loss of OTC function in model organisms is associated with metabolic stress and reduced fitness, supporting a pro-longevity role for its normal activity.",
"confidence": 0.65,
"key_pathways": [
"urea cycle / arginine biosynthesis",
"mTORC1 nutrient sensing via arginine",
"polyamine metabolism"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for OTC in Drosophila melanogaster. The mechanistic reasoning is plausible and well-constructed, covering OTC's role in the urea cycle/arginine biosynthesis, nitrogen disposal, polyamine metabolism, and mTORC1 nutrient sensing via arginine. The connection between OTC activity and mTOR signaling through arginine availability is a reasonable mechanistic link. The reasoning is somewhat speculative (as is typical for these predictions), but it is internally consistent and biologically sound. Confidence of 0.65 is appropriately calibrated. Minor deduction: the model doesn't cite specific Drosophila experimental evidence for OTC's pro-longevity role, relying more on general metabolic reasoning.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}