HIR1
S. cerevisiae
Hir1p
What the model saw
Gene: HIR1 Organism: Saccharomyces cerevisiae Known functions: Hir1p. DNA binding. identical protein binding. nucleosome binding. protein binding. transcription corepressor activity.
View unredacted entry
Hir1p. DNA binding. identical protein binding. nucleosome binding. protein binding. transcription corepressor activity.
Solver output
HIR1 encodes a core subunit of the HIR (Histone Regulatory) complex in S. cerevisiae, which functions as a transcription corepressor that binds nucleosomes and DNA to repress histone gene expression outside of S phase. By restraining histone gene transcription, HIR1 helps maintain proper histone stoichiometry and chromatin integrity, which is critical for preserving epigenetic information during aging. Dysregulation of histone levels is a well-established driver of epigenetic instability and replicative aging in yeast; loss of HIR complex function leads to excess free histones, disrupted chromatin structure, and accelerated aging. The nucleosome-binding and corepressor activities of Hir1p directly support chromatin compaction and silencing at specific loci, counteracting the global loss of heterochromatin that characterizes yeast aging. Additionally, proper histone homeostasis maintained by HIR1 supports genomic stability by preventing aberrant transcription and DNA damage accumulation.
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 HIR1 as pro_longevity, but the ground truth is anti_longevity. The model's reasoning is plausible-sounding but incorrect - it argues that HIR1 maintains chromatin integrity and histone homeostasis to support longevity, and that loss of HIR1 would accelerate aging. However, the actual GenAge classification indicates HIR1 is anti_longevity, meaning its deletion or loss likely extends lifespan. This is consistent with research showing that deletion of HIR complex components can extend replicative lifespan in yeast, possibly because reducing histone gene repression or altering chromatin dynamics can be beneficial. The model constructed a coherent but ultimately wrong mechanistic narrative, and expressed moderate-high confidence (0.65) in the wrong direction.
Raw API responses
solver
{
"reasoning": "HIR1 encodes a core subunit of the HIR (Histone Regulatory) complex in S. cerevisiae, which functions as a transcription corepressor that binds nucleosomes and DNA to repress histone gene expression outside of S phase. By restraining histone gene transcription, HIR1 helps maintain proper histone stoichiometry and chromatin integrity, which is critical for preserving epigenetic information during aging. Dysregulation of histone levels is a well-established driver of epigenetic instability and replicative aging in yeast; loss of HIR complex function leads to excess free histones, disrupted chromatin structure, and accelerated aging. The nucleosome-binding and corepressor activities of Hir1p directly support chromatin compaction and silencing at specific loci, counteracting the global loss of heterochromatin that characterizes yeast aging. Additionally, proper histone homeostasis maintained by HIR1 supports genomic stability by preventing aberrant transcription and DNA damage accumulation.",
"confidence": 0.65,
"key_pathways": [
"HIR complex-mediated histone gene repression",
"chromatin/nucleosome integrity maintenance",
"epigenetic silencing and heterochromatin preservation"
],
"mechanism_class": "epigenetic_alterations",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted HIR1 as pro_longevity, but the ground truth is anti_longevity. The model's reasoning is plausible-sounding but incorrect - it argues that HIR1 maintains chromatin integrity and histone homeostasis to support longevity, and that loss of HIR1 would accelerate aging. However, the actual GenAge classification indicates HIR1 is anti_longevity, meaning its deletion or loss likely extends lifespan. This is consistent with research showing that deletion of HIR complex components can extend replicative lifespan in yeast, possibly because reducing histone gene repression or altering chromatin dynamics can be beneficial. The model constructed a coherent but ultimately wrong mechanistic narrative, and expressed moderate-high confidence (0.65) in the wrong direction.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}