cgt-2
C. elegans
Ceramide glucosyltransferase 2
What the model saw
Gene: cgt-2 Organism: Caenorhabditis elegans Known functions: Ceramide glucosyltransferase 2. ceramide glucosyltransferase activity. glycosyltransferase activity.
View unredacted entry
Ceramide glucosyltransferase 2. ceramide glucosyltransferase activity. glycosyltransferase activity.
Solver output
CGT-2 encodes a ceramide glucosyltransferase that catalyzes the conversion of ceramide to glucosylceramide, the first and committed step in glycosphingolipid biosynthesis. In C. elegans, ceramide itself is a pro-longevity lipid mediator that promotes stress resistance and lifespan extension, in part by modulating insulin/IGF-1 signaling (DAF-2/DAF-16 pathway) and germline signaling. By consuming ceramide to produce glucosylceramide, CGT-2 activity reduces the bioavailable pool of ceramide, thereby attenuating ceramide-mediated longevity signals. Loss-of-function of ceramide glucosyltransferases in C. elegans has been associated with altered sphingolipid homeostasis that can extend lifespan, consistent with the normal function of cgt-2 being anti-longevity. The glycosphingolipid products also influence membrane composition and nutrient-sensing pathway activity, further linking this enzyme to aging regulation.
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 cgt-2. The mechanistic reasoning is sound: CGT-2 converts ceramide to glucosylceramide, depleting the pro-longevity ceramide pool, and loss of cgt-2 function would extend lifespan by preserving ceramide levels. The mechanism class "deregulated_nutrient_sensing" is a somewhat loose fit — sphingolipid metabolism is more directly the mechanism — but the core reasoning about ceramide/glucosylceramide balance and its connection to longevity pathways is biologically plausible and well-articulated. The confidence of 0.62 is appropriately moderate. Overall a good prediction with minor imprecision in mechanism classification.
Raw API responses
solver
{
"reasoning": "CGT-2 encodes a ceramide glucosyltransferase that catalyzes the conversion of ceramide to glucosylceramide, the first and committed step in glycosphingolipid biosynthesis. In C. elegans, ceramide itself is a pro-longevity lipid mediator that promotes stress resistance and lifespan extension, in part by modulating insulin/IGF-1 signaling (DAF-2/DAF-16 pathway) and germline signaling. By consuming ceramide to produce glucosylceramide, CGT-2 activity reduces the bioavailable pool of ceramide, thereby attenuating ceramide-mediated longevity signals. Loss-of-function of ceramide glucosyltransferases in C. elegans has been associated with altered sphingolipid homeostasis that can extend lifespan, consistent with the normal function of cgt-2 being anti-longevity. The glycosphingolipid products also influence membrane composition and nutrient-sensing pathway activity, further linking this enzyme to aging regulation.",
"confidence": 0.62,
"key_pathways": [
"sphingolipid metabolism / ceramide-glucosylceramide conversion",
"insulin/IGF-1 signaling (DAF-2/DAF-16)",
"glycosphingolipid biosynthesis"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicted anti_longevity for cgt-2. The mechanistic reasoning is sound: CGT-2 converts ceramide to glucosylceramide, depleting the pro-longevity ceramide pool, and loss of cgt-2 function would extend lifespan by preserving ceramide levels. The mechanism class \"deregulated_nutrient_sensing\" is a somewhat loose fit — sphingolipid metabolism is more directly the mechanism — but the core reasoning about ceramide/glucosylceramide balance and its connection to longevity pathways is biologically plausible and well-articulated. The confidence of 0.62 is appropriately moderate. Overall a good prediction with minor imprecision in mechanism classification.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}