fat-7
C. elegans
Delta(9)-fatty-acid desaturase fat-7
What the model saw
Gene: fat-7 Organism: Caenorhabditis elegans Known functions: Delta(9)-fatty-acid desaturase fat-7. iron ion binding. oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water. palmitoyl-CoA 9-desaturase activity. stearoyl-CoA 9-desaturase activity.
View unredacted entry
Delta(9)-fatty-acid desaturase fat-7. iron ion binding. oxidoreductase activity, acting on paired donors, with oxidation of a pair of donors resulting in the reduction of molecular oxygen to two molecules of water. palmitoyl-CoA 9-desaturase activity. stearoyl-CoA 9-desaturase activity.
Solver output
fat-7 encodes a Delta(9) fatty acid desaturase (stearoyl-CoA/palmitoyl-CoA 9-desaturase) that introduces a double bond at the Δ9 position of saturated fatty acids, converting stearoyl-CoA to oleoyl-CoA and palmitoyl-CoA to palmitoleoyl-CoA. This activity regulates the ratio of unsaturated to saturated fatty acids in membrane phospholipids, which is critical for membrane fluidity and lipid homeostasis. In C. elegans, increased monounsaturated fatty acid (MUFA) production via Δ9 desaturases is associated with improved membrane function and stress resistance. The fat-7 desaturase is transcriptionally upregulated under conditions that extend lifespan (e.g., dietary restriction and reduced insulin/IGF-1 signaling), and loss of fat-7 along with related desaturases (fat-5, fat-6) reduces lifespan and stress tolerance. Proper MUFA synthesis through fat-7 feeds into lipid signaling pathways that intersect with nutrient sensing (e.g., NHR-49/PPAR-like transcription factor axis), supporting metabolic flexibility and 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 correctly predicted pro_longevity for fat-7 in C. elegans. The mechanistic reasoning is detailed and accurate: fat-7 encodes a Delta(9) fatty acid desaturase that converts saturated fatty acids to MUFAs, regulating membrane fluidity and lipid homeostasis. The model correctly notes that fat-7 is upregulated under lifespan-extending conditions and that loss of fat-5/fat-6/fat-7 reduces lifespan. The NHR-49 connection is also accurate. The mechanism class "deregulated_nutrient_sensing" is a reasonable categorization given the intersection with nutrient sensing pathways, though "lipid metabolism" might be more precise. Overall, this is an excellent, well-reasoned prediction.
Raw API responses
solver
{
"reasoning": "fat-7 encodes a Delta(9) fatty acid desaturase (stearoyl-CoA/palmitoyl-CoA 9-desaturase) that introduces a double bond at the Δ9 position of saturated fatty acids, converting stearoyl-CoA to oleoyl-CoA and palmitoyl-CoA to palmitoleoyl-CoA. This activity regulates the ratio of unsaturated to saturated fatty acids in membrane phospholipids, which is critical for membrane fluidity and lipid homeostasis. In C. elegans, increased monounsaturated fatty acid (MUFA) production via Δ9 desaturases is associated with improved membrane function and stress resistance. The fat-7 desaturase is transcriptionally upregulated under conditions that extend lifespan (e.g., dietary restriction and reduced insulin/IGF-1 signaling), and loss of fat-7 along with related desaturases (fat-5, fat-6) reduces lifespan and stress tolerance. Proper MUFA synthesis through fat-7 feeds into lipid signaling pathways that intersect with nutrient sensing (e.g., NHR-49/PPAR-like transcription factor axis), supporting metabolic flexibility and longevity.",
"confidence": 0.72,
"key_pathways": [
"Delta(9) fatty acid desaturation / MUFA biosynthesis",
"NHR-49 lipid metabolism transcriptional regulation",
"Insulin/IGF-1 signaling and lipid homeostasis"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly predicted pro_longevity for fat-7 in C. elegans. The mechanistic reasoning is detailed and accurate: fat-7 encodes a Delta(9) fatty acid desaturase that converts saturated fatty acids to MUFAs, regulating membrane fluidity and lipid homeostasis. The model correctly notes that fat-7 is upregulated under lifespan-extending conditions and that loss of fat-5/fat-6/fat-7 reduces lifespan. The NHR-49 connection is also accurate. The mechanism class \"deregulated_nutrient_sensing\" is a reasonable categorization given the intersection with nutrient sensing pathways, though \"lipid metabolism\" might be more precise. Overall, this is an excellent, well-reasoned prediction.",
"failure_mode": "correct",
"answer_correct": true,
"mechanism_correct": true,
"reasoning_quality": 5,
"ground_truth_questionable": false
}