Sirt4
D. melanogaster
Sirtuin 4
What the model saw
Gene: Sirt4 Organism: Drosophila melanogaster Known functions: Sirtuin 4. sirtuin 4. NAD binding. NAD+ binding. NAD+ poly-ADP-ribosyltransferase activity. NAD-dependent protein lysine deacetylase activity. catalytic activity. histone deacetylase activity. histone deacetylase activity, NAD-dependent. zinc ion binding.
View unredacted entry
Sirtuin 4. sirtuin 4. NAD binding. NAD+ binding. NAD+ poly-ADP-ribosyltransferase activity. NAD-dependent protein lysine deacetylase activity. catalytic activity. histone deacetylase activity. histone deacetylase activity, NAD-dependent. zinc ion binding.
Solver output
Sirt4 is a NAD+-dependent sirtuin with deacetylase and ADP-ribosyltransferase activities, placing it squarely within the NAD+/sirtuin axis of nutrient sensing. In mammals, SIRT4 localizes to mitochondria and regulates metabolic enzymes including glutamate dehydrogenase (via ADP-ribosylation) and fatty acid oxidation pathways, thereby modulating amino acid-stimulated insulin secretion and mitochondrial metabolism. Its NAD+-dependence links it to the broader NAD+ decline seen in aging, and sirtuins as a class are broadly associated with lifespan extension. The NAD-dependent histone deacetylase activity also connects Sirt4 to epigenetic regulation of metabolic gene expression. While Sirt4's specific role in Drosophila longevity is less characterized than Sir2, its enzymatic activities in metabolic regulation and mitochondrial function suggest a pro-longevity role consistent with the sirtuin family's general function in stress response and metabolic homeostasis.
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 Sirt4 in Drosophila. The mechanistic reasoning is plausible and broadly correct - linking Sirt4 to NAD+/sirtuin axis, mitochondrial metabolism, and nutrient sensing. However, the reasoning relies heavily on mammalian SIRT4 data and general sirtuin class properties rather than Drosophila-specific evidence, and the model itself acknowledges that "Sirt4's specific role in Drosophila longevity is less characterized." The confidence (0.62) is appropriately moderate given this uncertainty. The mechanism class of "deregulated_nutrient_sensing" is reasonable. Overall, the answer is correct with decent but not exceptional mechanistic reasoning.
Raw API responses
solver
{
"reasoning": "Sirt4 is a NAD+-dependent sirtuin with deacetylase and ADP-ribosyltransferase activities, placing it squarely within the NAD+/sirtuin axis of nutrient sensing. In mammals, SIRT4 localizes to mitochondria and regulates metabolic enzymes including glutamate dehydrogenase (via ADP-ribosylation) and fatty acid oxidation pathways, thereby modulating amino acid-stimulated insulin secretion and mitochondrial metabolism. Its NAD+-dependence links it to the broader NAD+ decline seen in aging, and sirtuins as a class are broadly associated with lifespan extension. The NAD-dependent histone deacetylase activity also connects Sirt4 to epigenetic regulation of metabolic gene expression. While Sirt4's specific role in Drosophila longevity is less characterized than Sir2, its enzymatic activities in metabolic regulation and mitochondrial function suggest a pro-longevity role consistent with the sirtuin family's general function in stress response and metabolic homeostasis.",
"confidence": 0.62,
"key_pathways": [
"NAD+/sirtuin metabolic sensing",
"mitochondrial ADP-ribosylation and deacetylation",
"amino acid and fatty acid metabolism regulation"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for Sirt4 in Drosophila. The mechanistic reasoning is plausible and broadly correct - linking Sirt4 to NAD+/sirtuin axis, mitochondrial metabolism, and nutrient sensing. However, the reasoning relies heavily on mammalian SIRT4 data and general sirtuin class properties rather than Drosophila-specific evidence, and the model itself acknowledges that \"Sirt4's specific role in Drosophila longevity is less characterized.\" The confidence (0.62) is appropriately moderate given this uncertainty. The mechanism class of \"deregulated_nutrient_sensing\" is reasonable. Overall, the answer is correct with decent but not exceptional mechanistic reasoning.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 3,
"ground_truth_questionable": false
}