Grn
M. musculus
granulin
What the model saw
Gene: Grn Organism: Mus musculus Known functions: granulin. progranulin. protein binding. protein-folding chaperone binding.
View unredacted entry
granulin. progranulin. protein binding. protein-folding chaperone binding.
Solver output
Progranulin (PGRN), encoded by Grn, is a secreted glycoprotein with neurotrophic and lysosomal regulatory functions. Its protein-folding chaperone binding activity links it directly to proteostasis maintenance, as PGRN traffics to lysosomes and is required for proper lysosomal enzyme activity and autophagy-lysosome pathway function. Loss of Grn in mice leads to lysosomal dysfunction, accumulation of lipofuscin, neuroinflammation, and TDP-43 proteinopathy — hallmarks of accelerated cellular aging and neurodegeneration. PGRN also modulates NF-κB-driven inflammatory signaling; its absence promotes chronic neuroinflammation, a recognized driver of aging pathology. Additionally, PGRN supports cell survival and tissue homeostasis through protein binding interactions, and its deficiency is associated with frontotemporal dementia and accelerated brain aging phenotypes in mice, consistent with an anti-aging (pro-longevity) role for the normal gene product.
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 pro_longevity for Grn/progranulin in mice. The mechanistic reasoning is solid and well-grounded: it correctly identifies lysosomal dysfunction, lipofuscin accumulation, neuroinflammation, and TDP-43 proteinopathy as consequences of Grn loss, and links these to accelerated aging phenotypes. The connection to protein-folding chaperone binding and proteostasis is reasonable. The model appropriately notes frontotemporal dementia associations and accelerated brain aging in Grn knockout mice. Confidence of 0.68 is appropriate given the somewhat specialized nature of this gene's aging role. The reasoning is comprehensive and mechanistically accurate, though the "loss_of_proteostasis" mechanism class is a reasonable but somewhat narrow framing — lysosomal dysfunction and neuroinflammation are arguably equally or more central to the aging phenotype.
Raw API responses
solver
{
"reasoning": "Progranulin (PGRN), encoded by Grn, is a secreted glycoprotein with neurotrophic and lysosomal regulatory functions. Its protein-folding chaperone binding activity links it directly to proteostasis maintenance, as PGRN traffics to lysosomes and is required for proper lysosomal enzyme activity and autophagy-lysosome pathway function. Loss of Grn in mice leads to lysosomal dysfunction, accumulation of lipofuscin, neuroinflammation, and TDP-43 proteinopathy — hallmarks of accelerated cellular aging and neurodegeneration. PGRN also modulates NF-κB-driven inflammatory signaling; its absence promotes chronic neuroinflammation, a recognized driver of aging pathology. Additionally, PGRN supports cell survival and tissue homeostasis through protein binding interactions, and its deficiency is associated with frontotemporal dementia and accelerated brain aging phenotypes in mice, consistent with an anti-aging (pro-longevity) role for the normal gene product.",
"confidence": 0.68,
"key_pathways": [
"autophagy-lysosome pathway",
"proteostasis and chaperone network",
"neuroinflammation / NF-κB signaling"
],
"mechanism_class": "loss_of_proteostasis",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for Grn/progranulin in mice. The mechanistic reasoning is solid and well-grounded: it correctly identifies lysosomal dysfunction, lipofuscin accumulation, neuroinflammation, and TDP-43 proteinopathy as consequences of Grn loss, and links these to accelerated aging phenotypes. The connection to protein-folding chaperone binding and proteostasis is reasonable. The model appropriately notes frontotemporal dementia associations and accelerated brain aging in Grn knockout mice. Confidence of 0.68 is appropriate given the somewhat specialized nature of this gene's aging role. The reasoning is comprehensive and mechanistically accurate, though the \"loss_of_proteostasis\" mechanism class is a reasonable but somewhat narrow framing — lysosomal dysfunction and neuroinflammation are arguably equally or more central to the aging phenotype.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 4,
"ground_truth_questionable": false
}