ppk28
D. melanogaster
pickpocket 28
What the model saw
Gene: ppk28 Organism: Drosophila melanogaster Known functions: pickpocket 28. ligand-gated sodium channel activity. sodium channel activity.
View unredacted entry
pickpocket 28. ligand-gated sodium channel activity. sodium channel activity.
Solver output
ppk28 encodes a member of the DEG/ENaC (degenerin/epithelial sodium channel) superfamily in Drosophila, functioning as a ligand-gated and constitutive sodium channel. In Drosophila, ppk28 is known to mediate water/hygrosensory taste perception in gustatory neurons, influencing feeding and water intake behavior. While sodium channel activity and sensory signaling can modulate nutrient sensing and metabolic homeostasis, the specific role of ppk28 in longevity pathways is not well-established. Its primary function in sensory transduction (hygrosensation) does not map cleanly onto a canonical aging hallmark, and the downstream effects on lifespan—whether through altered fluid/ion homeostasis, feeding behavior, or intercellular signaling—are ambiguous without direct longevity data.
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 "unclear" with low confidence (0.35), while the ground truth is "anti_longevity." The model correctly identified ppk28's role in hygrosensory/gustatory transduction via DEG/ENaC channels, but failed to connect this to a longevity influence. The model's reasoning about the gene's sensory function is partially correct, but it did not arrive at the anti-longevity conclusion. The model was appropriately uncertain given limited direct longevity data, but the ground truth indicates ppk28 has an anti-longevity effect (meaning its loss or reduction extends lifespan, or its overexpression shortens it). The model's mechanism class of "altered_intercellular_communication" is not well-supported and somewhat off-target. Overall, the prediction missed the correct answer but was honest about uncertainty.
Raw API responses
solver
{
"reasoning": "ppk28 encodes a member of the DEG/ENaC (degenerin/epithelial sodium channel) superfamily in Drosophila, functioning as a ligand-gated and constitutive sodium channel. In Drosophila, ppk28 is known to mediate water/hygrosensory taste perception in gustatory neurons, influencing feeding and water intake behavior. While sodium channel activity and sensory signaling can modulate nutrient sensing and metabolic homeostasis, the specific role of ppk28 in longevity pathways is not well-established. Its primary function in sensory transduction (hygrosensation) does not map cleanly onto a canonical aging hallmark, and the downstream effects on lifespan—whether through altered fluid/ion homeostasis, feeding behavior, or intercellular signaling—are ambiguous without direct longevity data.",
"confidence": 0.35,
"key_pathways": [
"DEG/ENaC sodium channel signaling",
"hygrosensory/gustatory transduction",
"ion homeostasis"
],
"mechanism_class": "altered_intercellular_communication",
"longevity_influence": "unclear"
}advisor
{
"notes": "The model predicted \"unclear\" with low confidence (0.35), while the ground truth is \"anti_longevity.\" The model correctly identified ppk28's role in hygrosensory/gustatory transduction via DEG/ENaC channels, but failed to connect this to a longevity influence. The model's reasoning about the gene's sensory function is partially correct, but it did not arrive at the anti-longevity conclusion. The model was appropriately uncertain given limited direct longevity data, but the ground truth indicates ppk28 has an anti-longevity effect (meaning its loss or reduction extends lifespan, or its overexpression shortens it). The model's mechanism class of \"altered_intercellular_communication\" is not well-supported and somewhat off-target. Overall, the prediction missed the correct answer but was honest about uncertainty.",
"failure_mode": "appropriately_uncertain",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}