unc-26
C. elegans
Synaptojanin
What the model saw
Gene: unc-26 Organism: Caenorhabditis elegans Known functions: Synaptojanin. inositol-1,4,5-trisphosphate 5-phosphatase activity. phosphatase activity. phosphatidylinositol-3,5-bisphosphate 5-phosphatase activity. phosphatidylinositol-4,5-bisphosphate 5-phosphatase activity.
View unredacted entry
Synaptojanin. inositol-1,4,5-trisphosphate 5-phosphatase activity. phosphatase activity. phosphatidylinositol-3,5-bisphosphate 5-phosphatase activity. phosphatidylinositol-4,5-bisphosphate 5-phosphatase activity.
Solver output
UNC-26/Synaptojanin is a phosphoinositide phosphatase that hydrolyzes PI(4,5)P2 and PI(3,5)P2, thereby reducing levels of these signaling lipids. PI(4,5)P2 is a key substrate for PI3K (AGE-1 in C. elegans), and its hydrolysis by synaptojanin would dampen PI3K-Akt/DAF-16 pathway signaling. However, synaptojanin also degrades PI(3,5)P2, which is required for proper endolysosomal trafficking and autophagy flux. Reduced PI(3,5)P2 impairs autophagosome-lysosome fusion and macroautophagy, a process critical for longevity in C. elegans. Additionally, synaptojanin-mediated depletion of PI(4,5)P2 at synaptic vesicle membranes could indirectly affect insulin/IGF-1-like signaling dynamics. Because the dominant effect of synaptojanin activity is to suppress phosphoinositide pools that support both pro-longevity autophagy (via PI(3,5)P2) and potentially DAF-16 nuclear localization, its normal function is predicted to oppose 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 correctly predicts anti_longevity for unc-26/synaptojanin. However, the mechanistic reasoning is speculative and likely incorrect. UNC-26 is primarily known as a synaptic vesicle recycling factor (synaptojanin), and its role in longevity in C. elegans is more likely related to its neuronal/synaptic functions rather than the PI(3,5)P2-autophagy or insulin/IGF-1 signaling axes the model invokes. The model constructs a plausible-sounding but largely fabricated mechanistic chain connecting synaptojanin to DAF-16 nuclear localization and autophagy flux. The reasoning is internally consistent but not well-grounded in actual experimental evidence for unc-26's longevity role. The confidence of 0.55 is appropriately modest. The mechanism_class of 'deregulated_nutrient_sensing' is also questionable for a synaptic vesicle recycling protein.
Raw API responses
solver
{
"reasoning": "UNC-26/Synaptojanin is a phosphoinositide phosphatase that hydrolyzes PI(4,5)P2 and PI(3,5)P2, thereby reducing levels of these signaling lipids. PI(4,5)P2 is a key substrate for PI3K (AGE-1 in C. elegans), and its hydrolysis by synaptojanin would dampen PI3K-Akt/DAF-16 pathway signaling. However, synaptojanin also degrades PI(3,5)P2, which is required for proper endolysosomal trafficking and autophagy flux. Reduced PI(3,5)P2 impairs autophagosome-lysosome fusion and macroautophagy, a process critical for longevity in C. elegans. Additionally, synaptojanin-mediated depletion of PI(4,5)P2 at synaptic vesicle membranes could indirectly affect insulin/IGF-1-like signaling dynamics. Because the dominant effect of synaptojanin activity is to suppress phosphoinositide pools that support both pro-longevity autophagy (via PI(3,5)P2) and potentially DAF-16 nuclear localization, its normal function is predicted to oppose longevity.",
"confidence": 0.55,
"key_pathways": [
"phosphoinositide signaling / PI(3,5)P2-dependent autophagy",
"insulin/IGF-1 signaling (DAF-2/AGE-1/DAF-16 axis)",
"endolysosomal trafficking"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicts anti_longevity for unc-26/synaptojanin. However, the mechanistic reasoning is speculative and likely incorrect. UNC-26 is primarily known as a synaptic vesicle recycling factor (synaptojanin), and its role in longevity in C. elegans is more likely related to its neuronal/synaptic functions rather than the PI(3,5)P2-autophagy or insulin/IGF-1 signaling axes the model invokes. The model constructs a plausible-sounding but largely fabricated mechanistic chain connecting synaptojanin to DAF-16 nuclear localization and autophagy flux. The reasoning is internally consistent but not well-grounded in actual experimental evidence for unc-26's longevity role. The confidence of 0.55 is appropriately modest. The mechanism_class of 'deregulated_nutrient_sensing' is also questionable for a synaptic vesicle recycling protein.",
"failure_mode": "right_answer_wrong_reasoning",
"answer_correct": true,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}