FIS1
S. cerevisiae
Fis1p
What the model saw
Gene: FIS1 Organism: Saccharomyces cerevisiae Known functions: Fis1p. lipid binding. molecular adaptor activity. protein binding.
View unredacted entry
Fis1p. lipid binding. molecular adaptor activity. protein binding.
Solver output
FIS1 (Fission 1) encodes a tail-anchored outer mitochondrial membrane protein that acts as a molecular adaptor recruiting the dynamin-like GTPase Dnm1 (Drp1 in mammals) to drive mitochondrial fission. Excessive mitochondrial fragmentation driven by Fis1p activity disrupts the mitochondrial network, impairing oxidative phosphorylation efficiency and increasing ROS production. In yeast replicative and chronological aging models, mitochondrial fission/fusion balance is critical; hyperactive fission via Fis1p promotes accumulation of damaged, fragmented mitochondria that cannot be efficiently cleared by mitophagy. Loss of FIS1 in yeast has been associated with extended chronological lifespan, consistent with reduced mitochondrial fragmentation being beneficial. The lipid-binding and protein-binding activities of Fis1p facilitate its membrane anchoring and recruitment of fission machinery, directly linking its molecular function to pro-fission, pro-aging outcomes.
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 FIS1 as anti_longevity with high confidence (0.72). The mechanistic reasoning is detailed and accurate: FIS1 encodes a mitochondrial fission protein that recruits Dnm1 to drive mitochondrial fragmentation, and loss of FIS1 extends chronological lifespan in yeast. The model correctly connects the molecular adaptor activity listed in the entry to its role in mitochondrial fission machinery recruitment. The reasoning about mitochondrial dynamics, ROS production, and mitophagy impairment is well-grounded in the literature. Overall, this is an excellent prediction with correct answer and correct mechanism.
Raw API responses
solver
{
"reasoning": "FIS1 (Fission 1) encodes a tail-anchored outer mitochondrial membrane protein that acts as a molecular adaptor recruiting the dynamin-like GTPase Dnm1 (Drp1 in mammals) to drive mitochondrial fission. Excessive mitochondrial fragmentation driven by Fis1p activity disrupts the mitochondrial network, impairing oxidative phosphorylation efficiency and increasing ROS production. In yeast replicative and chronological aging models, mitochondrial fission/fusion balance is critical; hyperactive fission via Fis1p promotes accumulation of damaged, fragmented mitochondria that cannot be efficiently cleared by mitophagy. Loss of FIS1 in yeast has been associated with extended chronological lifespan, consistent with reduced mitochondrial fragmentation being beneficial. The lipid-binding and protein-binding activities of Fis1p facilitate its membrane anchoring and recruitment of fission machinery, directly linking its molecular function to pro-fission, pro-aging outcomes.",
"confidence": 0.72,
"key_pathways": [
"mitochondrial fission (Dnm1/Drp1 recruitment)",
"mitochondrial quality control and mitophagy",
"mitochondrial membrane dynamics"
],
"mechanism_class": "mitochondrial_dysfunction",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model correctly predicted FIS1 as anti_longevity with high confidence (0.72). The mechanistic reasoning is detailed and accurate: FIS1 encodes a mitochondrial fission protein that recruits Dnm1 to drive mitochondrial fragmentation, and loss of FIS1 extends chronological lifespan in yeast. The model correctly connects the molecular adaptor activity listed in the entry to its role in mitochondrial fission machinery recruitment. The reasoning about mitochondrial dynamics, ROS production, and mitophagy impairment is well-grounded in the literature. Overall, this is an excellent prediction with correct answer and correct mechanism.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 5,
"ground_truth_questionable": false
}