GIS1
S. cerevisiae
histone demethylase GIS1
What the model saw
Gene: GIS1 Organism: Saccharomyces cerevisiae Known functions: histone demethylase GIS1. DNA-binding transcription repressor activity, RNA polymerase II-specific. RNA polymerase II cis-regulatory region sequence-specific DNA binding. histone H3K36 demethylase activity. histone H3K9 demethylase activity. sequence-specific DNA binding. zinc ion binding.
View unredacted entry
histone demethylase GIS1. DNA-binding transcription repressor activity, RNA polymerase II-specific. RNA polymerase II cis-regulatory region sequence-specific DNA binding. histone H3K36 demethylase activity. histone H3K9 demethylase activity. sequence-specific DNA binding. zinc ion binding.
Solver output
GIS1 encodes a histone demethylase in S. cerevisiae with activity toward H3K36me and H3K9me marks, both of which are associated with transcriptional regulation and chromatin state maintenance. GIS1 is a known transcriptional repressor that acts downstream of the Ras/PKA and TOR nutrient-sensing pathways, repressing stress-response and post-diauxic shift (PDS) genes under nutrient-rich conditions, but its demethylase activity helps reset chromatin marks during nutrient limitation. Loss of GIS1 has been shown to shorten chronological lifespan in yeast, indicating its normal function supports longevity. Mechanistically, GIS1-mediated H3K36 demethylation counteracts age-associated accumulation of repressive or aberrant methylation marks, preserving appropriate gene expression programs during aging. Additionally, GIS1 functions in concert with RPH1 to regulate stress-response genes, and its activity is linked to caloric restriction-mimicking transcriptional states that extend lifespan. Thus, GIS1's epigenetic remodeling role in maintaining chromatin fidelity and enabling stress-response gene expression places it firmly 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 predicted GIS1 as pro_longevity with 0.72 confidence, but the ground truth is anti_longevity. The model's reasoning contains some accurate elements (GIS1 is indeed a histone demethylase involved in TOR/Ras-PKA signaling and post-diauxic shift regulation), but the key mechanistic claim that "loss of GIS1 has been shown to shorten chronological lifespan" appears to be incorrect or inverted. In reality, GIS1 is anti-longevity, meaning its deletion likely extends lifespan or its overexpression shortens it. The model also incorrectly frames GIS1's role as maintaining chromatin fidelity for longevity, when the actual evidence suggests GIS1 acts against longevity. The model was fairly confident (0.72) in the wrong direction.
Raw API responses
solver
{
"reasoning": "GIS1 encodes a histone demethylase in S. cerevisiae with activity toward H3K36me and H3K9me marks, both of which are associated with transcriptional regulation and chromatin state maintenance. GIS1 is a known transcriptional repressor that acts downstream of the Ras/PKA and TOR nutrient-sensing pathways, repressing stress-response and post-diauxic shift (PDS) genes under nutrient-rich conditions, but its demethylase activity helps reset chromatin marks during nutrient limitation. Loss of GIS1 has been shown to shorten chronological lifespan in yeast, indicating its normal function supports longevity. Mechanistically, GIS1-mediated H3K36 demethylation counteracts age-associated accumulation of repressive or aberrant methylation marks, preserving appropriate gene expression programs during aging. Additionally, GIS1 functions in concert with RPH1 to regulate stress-response genes, and its activity is linked to caloric restriction-mimicking transcriptional states that extend lifespan. Thus, GIS1's epigenetic remodeling role in maintaining chromatin fidelity and enabling stress-response gene expression places it firmly in the pro-longevity category.",
"confidence": 0.72,
"key_pathways": [
"H3K36/H3K9 histone demethylation and chromatin state maintenance",
"TOR/Ras-PKA nutrient sensing transcriptional reprogramming",
"Post-diauxic shift stress-response gene regulation"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted GIS1 as pro_longevity with 0.72 confidence, but the ground truth is anti_longevity. The model's reasoning contains some accurate elements (GIS1 is indeed a histone demethylase involved in TOR/Ras-PKA signaling and post-diauxic shift regulation), but the key mechanistic claim that \"loss of GIS1 has been shown to shorten chronological lifespan\" appears to be incorrect or inverted. In reality, GIS1 is anti-longevity, meaning its deletion likely extends lifespan or its overexpression shortens it. The model also incorrectly frames GIS1's role as maintaining chromatin fidelity for longevity, when the actual evidence suggests GIS1 acts against longevity. The model was fairly confident (0.72) in the wrong direction.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}