HNM1
S. cerevisiae
Hnm1p
What the model saw
Gene: HNM1 Organism: Saccharomyces cerevisiae Known functions: Hnm1p. (R)-carnitine transmembrane transporter activity. choline transmembrane transporter activity. ethanolamine transmembrane transporter activity. gamma-aminobutyric acid transmembrane transporter activity. transmembrane transporter activity.
View unredacted entry
Hnm1p. (R)-carnitine transmembrane transporter activity. choline transmembrane transporter activity. ethanolamine transmembrane transporter activity. gamma-aminobutyric acid transmembrane transporter activity. transmembrane transporter activity.
Solver output
HNM1 encodes a plasma membrane transporter responsible for the uptake of choline, ethanolamine, carnitine, and GABA in S. cerevisiae. Choline import via Hnm1p feeds directly into phosphatidylcholine biosynthesis through the CDP-choline (Kennedy) pathway, which is critical for maintaining membrane lipid homeostasis and proper organelle function. Adequate phosphatidylcholine levels support mitochondrial membrane integrity and autophagy flux, both of which are linked to longevity. Carnitine transport is important for mitochondrial fatty acid β-oxidation, supporting metabolic efficiency and reducing lipotoxic stress. Disruption of choline/carnitine import would impair these anabolic and catabolic pathways, leading to membrane dysfunction and metabolic imbalance that are associated with accelerated aging; thus the normal function of HNM1 is expected to be pro-longevity.
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 pro_longevity but the ground truth is anti_longevity. The model's reasoning focused on the beneficial roles of choline/carnitine transport for membrane homeostasis and mitochondrial function, concluding that HNM1 loss would be harmful. However, in yeast replicative or chronological aging studies, deletion of HNM1 (an anti-longevity gene) would actually extend lifespan, meaning the gene normally limits longevity. The model's mechanistic reasoning about phosphatidylcholine biosynthesis and fatty acid β-oxidation is plausible in general biology but leads to the wrong conclusion about the gene's longevity classification. The model had moderate confidence (0.62) but was still clearly wrong on both the answer and the mechanistic interpretation of how this transporter affects aging.
Raw API responses
solver
{
"reasoning": "HNM1 encodes a plasma membrane transporter responsible for the uptake of choline, ethanolamine, carnitine, and GABA in S. cerevisiae. Choline import via Hnm1p feeds directly into phosphatidylcholine biosynthesis through the CDP-choline (Kennedy) pathway, which is critical for maintaining membrane lipid homeostasis and proper organelle function. Adequate phosphatidylcholine levels support mitochondrial membrane integrity and autophagy flux, both of which are linked to longevity. Carnitine transport is important for mitochondrial fatty acid β-oxidation, supporting metabolic efficiency and reducing lipotoxic stress. Disruption of choline/carnitine import would impair these anabolic and catabolic pathways, leading to membrane dysfunction and metabolic imbalance that are associated with accelerated aging; thus the normal function of HNM1 is expected to be pro-longevity.",
"confidence": 0.62,
"key_pathways": [
"CDP-choline (Kennedy) pathway / phosphatidylcholine biosynthesis",
"Carnitine-dependent mitochondrial fatty acid β-oxidation",
"GABA shunt / nitrogen metabolism"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning focused on the beneficial roles of choline/carnitine transport for membrane homeostasis and mitochondrial function, concluding that HNM1 loss would be harmful. However, in yeast replicative or chronological aging studies, deletion of HNM1 (an anti-longevity gene) would actually extend lifespan, meaning the gene normally limits longevity. The model's mechanistic reasoning about phosphatidylcholine biosynthesis and fatty acid β-oxidation is plausible in general biology but leads to the wrong conclusion about the gene's longevity classification. The model had moderate confidence (0.62) but was still clearly wrong on both the answer and the mechanistic interpretation of how this transporter affects aging.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}