ubh-4
C. elegans
Ubiquitin carboxyl-terminal hydrolase ubh-4
What the model saw
Gene: ubh-4 Organism: Caenorhabditis elegans Known functions: Ubiquitin carboxyl-terminal hydrolase ubh-4. cysteine-type deubiquitinase activity. protein binding.
View unredacted entry
Ubiquitin carboxyl-terminal hydrolase ubh-4. cysteine-type deubiquitinase activity. protein binding.
Solver output
ubh-4 encodes a deubiquitinase (DUB) with cysteine-type catalytic activity, functioning to remove ubiquitin chains from substrate proteins. Deubiquitinases play a critical role in maintaining proteostasis by recycling ubiquitin monomers, rescuing proteins from proteasomal degradation, and editing ubiquitin chain topology. In C. elegans, proper ubiquitin homeostasis is essential for proteasome function and clearance of damaged or misfolded proteins, both of which decline with age. The closest mammalian ortholog, UCH-L1/UCH-L3, is associated with neuronal proteostasis and longevity-related pathways. By sustaining the free ubiquitin pool and supporting proteasomal substrate processing, ubh-4 activity is expected to counteract the age-associated collapse of proteostasis, thereby promoting 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 but the ground truth is anti_longevity. The model's reasoning about deubiquitinases generally supporting proteostasis and longevity is plausible in principle, but it led to the wrong conclusion for ubh-4 specifically. The model assumed that because DUBs maintain ubiquitin homeostasis, ubh-4 would be pro-longevity, but ubh-4 is actually anti-longevity in C. elegans. The model's confidence of 0.62 is moderate but still wrong. The mechanistic reasoning is generic and not specific to ubh-4's actual role - it doesn't account for the possibility that ubh-4 might rescue proteins from degradation that should be cleared, or that its loss might actually extend lifespan by enhancing protein turnover. The reasoning quality is low because it relies on general DUB biology without considering that specific DUBs can have anti-longevity effects by stabilizing proteins that promote aging or by competing with beneficial protein degradation.
Raw API responses
solver
{
"reasoning": "ubh-4 encodes a deubiquitinase (DUB) with cysteine-type catalytic activity, functioning to remove ubiquitin chains from substrate proteins. Deubiquitinases play a critical role in maintaining proteostasis by recycling ubiquitin monomers, rescuing proteins from proteasomal degradation, and editing ubiquitin chain topology. In C. elegans, proper ubiquitin homeostasis is essential for proteasome function and clearance of damaged or misfolded proteins, both of which decline with age. The closest mammalian ortholog, UCH-L1/UCH-L3, is associated with neuronal proteostasis and longevity-related pathways. By sustaining the free ubiquitin pool and supporting proteasomal substrate processing, ubh-4 activity is expected to counteract the age-associated collapse of proteostasis, thereby promoting longevity.",
"confidence": 0.62,
"key_pathways": [
"ubiquitin-proteasome system",
"deubiquitination/ubiquitin recycling",
"proteostasis maintenance"
],
"mechanism_class": "loss_of_proteostasis",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about deubiquitinases generally supporting proteostasis and longevity is plausible in principle, but it led to the wrong conclusion for ubh-4 specifically. The model assumed that because DUBs maintain ubiquitin homeostasis, ubh-4 would be pro-longevity, but ubh-4 is actually anti-longevity in C. elegans. The model's confidence of 0.62 is moderate but still wrong. The mechanistic reasoning is generic and not specific to ubh-4's actual role - it doesn't account for the possibility that ubh-4 might rescue proteins from degradation that should be cleared, or that its loss might actually extend lifespan by enhancing protein turnover. The reasoning quality is low because it relies on general DUB biology without considering that specific DUBs can have anti-longevity effects by stabilizing proteins that promote aging or by competing with beneficial protein degradation.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}