Gpx4
M. musculus
glutathione peroxidase 4
What the model saw
Gene: Gpx4 Organism: Mus musculus Known functions: glutathione peroxidase 4. phospholipid hydroperoxide glutathione peroxidase GPX4. glutathione peroxidase activity. identical protein binding. peroxidase activity. phospholipid-hydroperoxide glutathione peroxidase activity. selenium binding.
View unredacted entry
glutathione peroxidase 4. phospholipid hydroperoxide glutathione peroxidase GPX4. glutathione peroxidase activity. identical protein binding. peroxidase activity. phospholipid-hydroperoxide glutathione peroxidase activity. selenium binding.
Solver output
GPX4 (Glutathione Peroxidase 4) is the only known enzyme capable of directly reducing phospholipid hydroperoxides (PLOOHs) within biological membranes using glutathione as a cofactor, thereby preventing the propagation of lipid peroxidation chain reactions. Its selenium-dependent peroxidase activity is essential for suppressing ferroptosis, a form of oxidative, iron-dependent cell death driven by uncontrolled lipid peroxidation. By neutralizing membrane-embedded lipid hydroperoxides—particularly in mitochondrial membranes—GPX4 protects mitochondrial integrity and function, directly countering mitochondrial dysfunction, a hallmark of aging. Loss of GPX4 in mice leads to embryonic lethality and tissue-specific knockouts cause rapid neurodegeneration and organ failure, underscoring its essential cytoprotective role. Maintenance of GPX4 activity preserves cellular viability against oxidative stress accumulation, which is a major driver of age-related tissue deterioration.
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" with high confidence (0.82), but the ground truth is "anti_longevity." GPX4 is classified as anti-longevity in GenAge, likely because heterozygous Gpx4+/- mice have been shown to have extended lifespan compared to wild-type controls, suggesting that partial reduction of GPX4 activity (and thus increased oxidative stress signaling) can promote longevity — consistent with the mitohormesis/oxidative stress hormesis hypothesis. The model's reasoning, while mechanistically accurate about GPX4's role in ferroptosis suppression and lipid peroxidation, incorrectly extrapolates that protective antioxidant function = pro-longevity. The model failed to consider that in mice, reducing GPX4 activity (not increasing it) extends lifespan, making GPX4 anti-longevity. The mechanism class of "mitochondrial_dysfunction" is also not the primary classification for GPX4's longevity role — ferroptosis/oxidative stress hormesis would be more appropriate. The reasoning quality is moderate — the biochemistry is correct but the longevity inference is wrong and overconfident.
Raw API responses
solver
{
"reasoning": "GPX4 (Glutathione Peroxidase 4) is the only known enzyme capable of directly reducing phospholipid hydroperoxides (PLOOHs) within biological membranes using glutathione as a cofactor, thereby preventing the propagation of lipid peroxidation chain reactions. Its selenium-dependent peroxidase activity is essential for suppressing ferroptosis, a form of oxidative, iron-dependent cell death driven by uncontrolled lipid peroxidation. By neutralizing membrane-embedded lipid hydroperoxides—particularly in mitochondrial membranes—GPX4 protects mitochondrial integrity and function, directly countering mitochondrial dysfunction, a hallmark of aging. Loss of GPX4 in mice leads to embryonic lethality and tissue-specific knockouts cause rapid neurodegeneration and organ failure, underscoring its essential cytoprotective role. Maintenance of GPX4 activity preserves cellular viability against oxidative stress accumulation, which is a major driver of age-related tissue deterioration.",
"confidence": 0.82,
"key_pathways": [
"Ferroptosis suppression via phospholipid hydroperoxide reduction",
"Glutathione-dependent antioxidant defense",
"Mitochondrial membrane lipid peroxidation control"
],
"mechanism_class": "mitochondrial_dysfunction",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted \"pro_longevity\" with high confidence (0.82), but the ground truth is \"anti_longevity.\" GPX4 is classified as anti-longevity in GenAge, likely because heterozygous Gpx4+/- mice have been shown to have extended lifespan compared to wild-type controls, suggesting that partial reduction of GPX4 activity (and thus increased oxidative stress signaling) can promote longevity — consistent with the mitohormesis/oxidative stress hormesis hypothesis. The model's reasoning, while mechanistically accurate about GPX4's role in ferroptosis suppression and lipid peroxidation, incorrectly extrapolates that protective antioxidant function = pro-longevity. The model failed to consider that in mice, reducing GPX4 activity (not increasing it) extends lifespan, making GPX4 anti-longevity. The mechanism class of \"mitochondrial_dysfunction\" is also not the primary classification for GPX4's longevity role — ferroptosis/oxidative stress hormesis would be more appropriate. The reasoning quality is moderate — the biochemistry is correct but the longevity inference is wrong and overconfident.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}