ttm-5
C. elegans
Putative sphingolipid delta(4)-desaturase/C4-monooxygenase
What the model saw
Gene: ttm-5 Organism: Caenorhabditis elegans Known functions: Putative sphingolipid delta(4)-desaturase/C4-monooxygenase. catalytic activity. sphingolipid C4-monooxygenase activity. sphingolipid delta-4 desaturase activity.
View unredacted entry
Putative sphingolipid delta(4)-desaturase/C4-monooxygenase. catalytic activity. sphingolipid C4-monooxygenase activity. sphingolipid delta-4 desaturase activity.
Solver output
ttm-5 encodes a putative sphingolipid delta(4)-desaturase/C4-monooxygenase, which catalyzes the desaturation or hydroxylation of the sphingoid base backbone at the C4 position. This enzymatic activity is critical for the biosynthesis of specific ceramide and sphingolipid species (e.g., 4-hydroxysphinganine/phytosphingosine or sphingosine). In C. elegans, sphingolipid composition—particularly the balance between ceramide species—is tightly linked to nutrient sensing pathways including insulin/IGF-1 signaling and TOR signaling, which are central regulators of longevity. Altered ceramide profiles can modulate stress resistance, autophagy flux, and lipid homeostasis, all of which influence lifespan. The desaturase/monooxygenase activity of ttm-5 likely contributes to maintaining a favorable sphingolipid balance that supports membrane integrity and signaling fidelity, consistent with a pro-longevity role, though the specific downstream effectors in C. elegans remain incompletely characterized.
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 sphingolipid metabolism and its connection to longevity pathways is plausible in general terms, but it incorrectly concludes that ttm-5 is pro-longevity. The model speculated that ttm-5 maintains a "favorable sphingolipid balance" supporting longevity, when in fact ttm-5 acts as an anti-longevity gene (meaning its loss or reduction likely extends lifespan). The mechanism class of "deregulated_nutrient_sensing" is also questionable for a sphingolipid desaturase. The confidence of 0.55 is relatively low, but the model still committed to the wrong answer. The reasoning quality is poor because it makes an unsupported leap from general sphingolipid biology to a pro-longevity conclusion without acknowledging that sphingolipid desaturases could equally be anti-longevity factors.
Raw API responses
solver
{
"reasoning": "ttm-5 encodes a putative sphingolipid delta(4)-desaturase/C4-monooxygenase, which catalyzes the desaturation or hydroxylation of the sphingoid base backbone at the C4 position. This enzymatic activity is critical for the biosynthesis of specific ceramide and sphingolipid species (e.g., 4-hydroxysphinganine/phytosphingosine or sphingosine). In C. elegans, sphingolipid composition—particularly the balance between ceramide species—is tightly linked to nutrient sensing pathways including insulin/IGF-1 signaling and TOR signaling, which are central regulators of longevity. Altered ceramide profiles can modulate stress resistance, autophagy flux, and lipid homeostasis, all of which influence lifespan. The desaturase/monooxygenase activity of ttm-5 likely contributes to maintaining a favorable sphingolipid balance that supports membrane integrity and signaling fidelity, consistent with a pro-longevity role, though the specific downstream effectors in C. elegans remain incompletely characterized.",
"confidence": 0.55,
"key_pathways": [
"sphingolipid biosynthesis and ceramide metabolism",
"insulin/IGF-1 signaling (IIS) pathway",
"lipid homeostasis and membrane composition"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning about sphingolipid metabolism and its connection to longevity pathways is plausible in general terms, but it incorrectly concludes that ttm-5 is pro-longevity. The model speculated that ttm-5 maintains a \"favorable sphingolipid balance\" supporting longevity, when in fact ttm-5 acts as an anti-longevity gene (meaning its loss or reduction likely extends lifespan). The mechanism class of \"deregulated_nutrient_sensing\" is also questionable for a sphingolipid desaturase. The confidence of 0.55 is relatively low, but the model still committed to the wrong answer. The reasoning quality is poor because it makes an unsupported leap from general sphingolipid biology to a pro-longevity conclusion without acknowledging that sphingolipid desaturases could equally be anti-longevity factors.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}