Sirt1
D. melanogaster
Sirtuin 1
What the model saw
Gene: Sirt1 Organism: Drosophila melanogaster Known functions: Sirtuin 1. sirtuin 1. NAD+ binding. NAD-dependent protein lysine deacetylase activity. histone H3K14 deacetylase activity, NAD-dependent. histone H3K9 deacetylase activity, NAD-dependent. histone H4K deacetylase activity. histone H4K16 deacetylase activity, NAD-dependent. histone deacetylase activity. histone deacetylase activity, NAD-dependent. protein lysine deacetylase activity. transcription coactivator binding. transcription corepressor activity.
View unredacted entry
Sirtuin 1. sirtuin 1. NAD+ binding. NAD-dependent protein lysine deacetylase activity. histone H3K14 deacetylase activity, NAD-dependent. histone H3K9 deacetylase activity, NAD-dependent. histone H4K deacetylase activity. histone H4K16 deacetylase activity, NAD-dependent. histone deacetylase activity. histone deacetylase activity, NAD-dependent. protein lysine deacetylase activity. transcription coactivator binding. transcription corepressor activity.
Solver output
Sirt1 (the Drosophila ortholog of Sir2) is an NAD+-dependent protein lysine deacetylase that targets histones H3K9, H3K14, H4K16, and other lysine residues, directly regulating chromatin compaction and gene silencing. Elevated Sir2/Sirt1 activity is well-established to extend lifespan in multiple model organisms including Drosophila, primarily by maintaining repressive chromatin states and suppressing transcriptional noise associated with aging. Its NAD+-dependence links it to cellular energy/nutrient sensing, and it deacetylates key non-histone targets (e.g., p53, FOXO) to suppress apoptosis and promote stress resistance. As a transcription corepressor, it silences pro-aging gene programs, and its activity declines with age as NAD+ levels fall, contributing to epigenetic drift. Overexpression of dSir2 in Drosophila has been shown to extend lifespan, firmly placing it in the pro-longevity category.
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 Drosophila Sirt1 with high confidence (0.92). The mechanistic reasoning is thorough and accurate: it correctly identifies Sirt1 as an NAD+-dependent histone deacetylase, links it to chromatin silencing and epigenetic regulation, mentions the NAD+/nutrient sensing connection, references FOXO regulation, and correctly cites that dSir2 overexpression extends lifespan in Drosophila. The mechanism class of epigenetic_alterations is appropriate. The reasoning is well-supported by the scientific literature.
Raw API responses
solver
{
"reasoning": "Sirt1 (the Drosophila ortholog of Sir2) is an NAD+-dependent protein lysine deacetylase that targets histones H3K9, H3K14, H4K16, and other lysine residues, directly regulating chromatin compaction and gene silencing. Elevated Sir2/Sirt1 activity is well-established to extend lifespan in multiple model organisms including Drosophila, primarily by maintaining repressive chromatin states and suppressing transcriptional noise associated with aging. Its NAD+-dependence links it to cellular energy/nutrient sensing, and it deacetylates key non-histone targets (e.g., p53, FOXO) to suppress apoptosis and promote stress resistance. As a transcription corepressor, it silences pro-aging gene programs, and its activity declines with age as NAD+ levels fall, contributing to epigenetic drift. Overexpression of dSir2 in Drosophila has been shown to extend lifespan, firmly placing it in the pro-longevity category.",
"confidence": 0.92,
"key_pathways": [
"NAD+-dependent histone deacetylation / chromatin silencing",
"FOXO transcription factor regulation",
"Nutrient sensing via NAD+/NADH ratio"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for Drosophila Sirt1 with high confidence (0.92). The mechanistic reasoning is thorough and accurate: it correctly identifies Sirt1 as an NAD+-dependent histone deacetylase, links it to chromatin silencing and epigenetic regulation, mentions the NAD+/nutrient sensing connection, references FOXO regulation, and correctly cites that dSir2 overexpression extends lifespan in Drosophila. The mechanism class of epigenetic_alterations is appropriate. The reasoning is well-supported by the scientific literature.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 5,
"ground_truth_questionable": false
}