Hsp22
D. melanogaster
Heat shock protein 22
What the model saw
Gene: Hsp22 Organism: Drosophila melanogaster Known functions: Heat shock protein 22. heat shock protein 22. identical protein binding. protein folding chaperone. unfolded protein binding.
View unredacted entry
Heat shock protein 22. heat shock protein 22. identical protein binding. protein folding chaperone. unfolded protein binding.
Solver output
Hsp22 is a small heat shock protein (sHSP) localized to the mitochondrial matrix in Drosophila that functions as a molecular chaperone by binding unfolded/misfolded proteins and preventing their aggregation, thereby maintaining proteostasis. Overexpression of Hsp22 in Drosophila has been experimentally shown to extend lifespan, while its expression naturally increases with age, suggesting it is a stress-responsive pro-survival factor. As a chaperone, it directly counteracts the age-associated accumulation of damaged and aggregated proteins—a hallmark of aging—by facilitating proper protein folding and sequestering unfolded intermediates. Its identical protein binding activity supports oligomeric chaperone complex formation, which is the functional unit for substrate capture. This places Hsp22 squarely in the proteostasis maintenance axis, opposing the loss of proteostasis that drives aging.
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" with high confidence (0.88), but the ground truth is "unclear." The mechanistic reasoning is largely sound — Hsp22 is indeed a mitochondrial small heat shock protein in Drosophila, and there is published evidence that its overexpression can extend lifespan. However, the evidence in the literature is apparently mixed or insufficient for GenAge to classify it definitively as pro-longevity. The model was overconfident and failed to account for the ambiguity in the evidence base. The mechanism described (proteostasis maintenance via chaperone activity) is biologically plausible and consistent with known Hsp22 biology, but the conclusion drawn from it is too strong given the actual state of evidence.
Raw API responses
solver
{
"reasoning": "Hsp22 is a small heat shock protein (sHSP) localized to the mitochondrial matrix in Drosophila that functions as a molecular chaperone by binding unfolded/misfolded proteins and preventing their aggregation, thereby maintaining proteostasis. Overexpression of Hsp22 in Drosophila has been experimentally shown to extend lifespan, while its expression naturally increases with age, suggesting it is a stress-responsive pro-survival factor. As a chaperone, it directly counteracts the age-associated accumulation of damaged and aggregated proteins—a hallmark of aging—by facilitating proper protein folding and sequestering unfolded intermediates. Its identical protein binding activity supports oligomeric chaperone complex formation, which is the functional unit for substrate capture. This places Hsp22 squarely in the proteostasis maintenance axis, opposing the loss of proteostasis that drives aging.",
"confidence": 0.88,
"key_pathways": [
"proteostasis/chaperone network",
"heat shock response",
"mitochondrial protein quality control"
],
"mechanism_class": "loss_of_proteostasis",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted \"pro_longevity\" with high confidence (0.88), but the ground truth is \"unclear.\" The mechanistic reasoning is largely sound — Hsp22 is indeed a mitochondrial small heat shock protein in Drosophila, and there is published evidence that its overexpression can extend lifespan. However, the evidence in the literature is apparently mixed or insufficient for GenAge to classify it definitively as pro-longevity. The model was overconfident and failed to account for the ambiguity in the evidence base. The mechanism described (proteostasis maintenance via chaperone activity) is biologically plausible and consistent with known Hsp22 biology, but the conclusion drawn from it is too strong given the actual state of evidence.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": true,
"reasoning_quality": 3,
"ground_truth_questionable": false
}