FRE6
S. cerevisiae
putative ferric-chelate reductase
What the model saw
Gene: FRE6 Organism: Saccharomyces cerevisiae Known functions: putative ferric-chelate reductase. ferric-chelate reductase (NADPH) activity. ferric-chelate reductase activity. oxidoreductase activity.
View unredacted entry
putative ferric-chelate reductase. ferric-chelate reductase (NADPH) activity. ferric-chelate reductase activity. oxidoreductase activity.
Solver output
FRE6 encodes a putative ferric-chelate reductase that reduces Fe³⁺ to Fe²⁺ using NADPH as an electron donor. In yeast, ferric reductases are critical for iron acquisition and intracellular iron homeostasis, including vacuolar and mitochondrial iron mobilization. While proper iron homeostasis is essential for mitochondrial function (iron-sulfur cluster assembly, heme biosynthesis), excess free Fe²⁺ generated by ferric reductase activity can drive Fenton chemistry, producing hydroxyl radicals that cause oxidative damage — a pro-aging mechanism. Conversely, insufficient iron reduction impairs respiratory chain function and mitochondrial integrity. FRE6 is specifically localized to the vacuole/mitochondria rather than the plasma membrane (unlike FRE1/FRE2), making its net contribution to longevity ambiguous: it could support mitochondrial iron supply (pro-longevity) or exacerbate iron-mediated oxidative stress (anti-longevity). The balance between these opposing effects makes a definitive directional prediction unreliable without additional context.
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 "unclear" while the ground truth is "anti_longevity." The model did consider the anti-longevity mechanism (iron-mediated oxidative stress via Fenton chemistry) as one possibility, but ultimately declined to commit to a direction. The mechanistic reasoning is plausible and shows good knowledge of FRE6's biology (vacuolar/mitochondrial localization, ferric reductase activity, iron homeostasis), but the model failed to identify the correct directional influence. The model's uncertainty was somewhat appropriate given the limited information provided, but it still got the answer wrong. The reasoning quality is moderate — it correctly identifies relevant pathways but doesn't reach the correct conclusion.
Raw API responses
solver
{
"reasoning": "FRE6 encodes a putative ferric-chelate reductase that reduces Fe³⁺ to Fe²⁺ using NADPH as an electron donor. In yeast, ferric reductases are critical for iron acquisition and intracellular iron homeostasis, including vacuolar and mitochondrial iron mobilization. While proper iron homeostasis is essential for mitochondrial function (iron-sulfur cluster assembly, heme biosynthesis), excess free Fe²⁺ generated by ferric reductase activity can drive Fenton chemistry, producing hydroxyl radicals that cause oxidative damage — a pro-aging mechanism. Conversely, insufficient iron reduction impairs respiratory chain function and mitochondrial integrity. FRE6 is specifically localized to the vacuole/mitochondria rather than the plasma membrane (unlike FRE1/FRE2), making its net contribution to longevity ambiguous: it could support mitochondrial iron supply (pro-longevity) or exacerbate iron-mediated oxidative stress (anti-longevity). The balance between these opposing effects makes a definitive directional prediction unreliable without additional context.",
"confidence": 0.38,
"key_pathways": [
"iron homeostasis and ferric reduction",
"mitochondrial iron-sulfur cluster assembly",
"NADPH-dependent oxidoreductase / reactive oxygen species generation"
],
"mechanism_class": "mitochondrial_dysfunction",
"longevity_influence": "unclear"
}advisor
{
"notes": "The model predicted \"unclear\" while the ground truth is \"anti_longevity.\" The model did consider the anti-longevity mechanism (iron-mediated oxidative stress via Fenton chemistry) as one possibility, but ultimately declined to commit to a direction. The mechanistic reasoning is plausible and shows good knowledge of FRE6's biology (vacuolar/mitochondrial localization, ferric reductase activity, iron homeostasis), but the model failed to identify the correct directional influence. The model's uncertainty was somewhat appropriate given the limited information provided, but it still got the answer wrong. The reasoning quality is moderate — it correctly identifies relevant pathways but doesn't reach the correct conclusion.",
"failure_mode": "appropriately_uncertain",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}