CTA1
S. cerevisiae
catalase A
What the model saw
Gene: CTA1 Organism: Saccharomyces cerevisiae Known functions: catalase A. catalase activity. heme binding. protein binding.
View unredacted entry
catalase A. catalase activity. heme binding. protein binding.
Solver output
CTA1 encodes catalase A in S. cerevisiae, a peroxisomal/mitochondrial catalase that decomposes hydrogen peroxide (H₂O₂) into water and oxygen via its heme-dependent catalytic activity. By neutralizing H₂O₂, CTA1 directly reduces reactive oxygen species (ROS) accumulation, thereby limiting oxidative damage to macromolecules including mitochondrial DNA, proteins, and lipids. Mitochondrial ROS is a central driver of age-related mitochondrial dysfunction, and catalase activity is a well-established component of the antioxidant defense network that counteracts this hallmark. Overexpression of catalase in yeast and other model organisms has been shown to extend lifespan, consistent with a pro-longevity role. The heme-binding function is integral to its catalytic mechanism and does not alter this interpretation.
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 CTA1 as pro_longevity with high confidence (0.82), but the ground truth is anti_longevity. The model's reasoning follows a plausible but incorrect logic: it assumes that because catalase A degrades H₂O₂ (a ROS), it must be pro-longevity. However, in S. cerevisiae, CTA1 (catalase A) is actually anti-longevity. The actual mechanism in yeast is more nuanced — H₂O₂ at low concentrations can act as a signaling molecule that promotes stress resistance and hormesis, and catalase activity can paradoxically reduce lifespan by eliminating beneficial H₂O₂ signaling. The model also incorrectly classifies the mechanism as "mitochondrial_dysfunction" when CTA1 is primarily a peroxisomal enzyme. The model's claim that "overexpression of catalase in yeast... has been shown to extend lifespan" is not well-supported for CTA1 specifically in S. cerevisiae, and the model was overconfident in its incorrect prediction.
Raw API responses
solver
{
"reasoning": "CTA1 encodes catalase A in S. cerevisiae, a peroxisomal/mitochondrial catalase that decomposes hydrogen peroxide (H₂O₂) into water and oxygen via its heme-dependent catalytic activity. By neutralizing H₂O₂, CTA1 directly reduces reactive oxygen species (ROS) accumulation, thereby limiting oxidative damage to macromolecules including mitochondrial DNA, proteins, and lipids. Mitochondrial ROS is a central driver of age-related mitochondrial dysfunction, and catalase activity is a well-established component of the antioxidant defense network that counteracts this hallmark. Overexpression of catalase in yeast and other model organisms has been shown to extend lifespan, consistent with a pro-longevity role. The heme-binding function is integral to its catalytic mechanism and does not alter this interpretation.",
"confidence": 0.82,
"key_pathways": [
"H2O2 detoxification / ROS scavenging",
"Peroxisomal antioxidant defense",
"Mitochondrial oxidative stress response"
],
"mechanism_class": "mitochondrial_dysfunction",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted CTA1 as pro_longevity with high confidence (0.82), but the ground truth is anti_longevity. The model's reasoning follows a plausible but incorrect logic: it assumes that because catalase A degrades H₂O₂ (a ROS), it must be pro-longevity. However, in S. cerevisiae, CTA1 (catalase A) is actually anti-longevity. The actual mechanism in yeast is more nuanced — H₂O₂ at low concentrations can act as a signaling molecule that promotes stress resistance and hormesis, and catalase activity can paradoxically reduce lifespan by eliminating beneficial H₂O₂ signaling. The model also incorrectly classifies the mechanism as \"mitochondrial_dysfunction\" when CTA1 is primarily a peroxisomal enzyme. The model's claim that \"overexpression of catalase in yeast... has been shown to extend lifespan\" is not well-supported for CTA1 specifically in S. cerevisiae, and the model was overconfident in its incorrect prediction.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}