mtl-2
C. elegans
Metallothionein-2
What the model saw
Gene: mtl-2 Organism: Caenorhabditis elegans Known functions: Metallothionein-2. cadmium ion binding. zinc ion binding.
View unredacted entry
Metallothionein-2. cadmium ion binding. zinc ion binding.
Solver output
Metallothioneins are small cysteine-rich proteins that bind heavy metal ions such as zinc and cadmium, serving dual roles in metal homeostasis and protection against metal-induced oxidative stress. In C. elegans, zinc homeostasis is tightly linked to stress resistance and longevity; proper zinc buffering by metallothioneins prevents zinc toxicity and reduces reactive oxygen species generated by redox-active or displaced metals. Additionally, metallothioneins can act as antioxidants by scavenging free radicals through their thiol-rich cysteine residues, thereby reducing oxidative damage—a key driver of aging. mtl-2 expression is upregulated under stress conditions and is regulated by the DAF-16/FOXO transcription factor, placing it downstream of the insulin/IGF-1 signaling pathway that is central to C. elegans longevity. By mitigating metal-induced proteotoxic and oxidative stress, mtl-2 is expected to support organismal healthspan and lifespan.
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 is plausible on the surface (metallothioneins as antioxidants, DAF-16 regulation, zinc homeostasis), but it missed the actual experimental evidence that mtl-2 in C. elegans has an anti-longevity effect. The model's mechanistic reasoning about metallothioneins generally being protective is generic and not specific to the actual experimental findings for mtl-2. The model showed moderate confidence (0.62) in the wrong direction. The claim that mtl-2 is regulated by DAF-16/FOXO may have some basis, but the conclusion drawn from this (pro_longevity) is incorrect - being a DAF-16 target doesn't necessarily mean pro-longevity. The actual anti-longevity role of mtl-2 may relate to its role in sequestering zinc away from processes that require it, or other mechanisms that the model failed to consider.
Raw API responses
solver
{
"reasoning": "Metallothioneins are small cysteine-rich proteins that bind heavy metal ions such as zinc and cadmium, serving dual roles in metal homeostasis and protection against metal-induced oxidative stress. In C. elegans, zinc homeostasis is tightly linked to stress resistance and longevity; proper zinc buffering by metallothioneins prevents zinc toxicity and reduces reactive oxygen species generated by redox-active or displaced metals. Additionally, metallothioneins can act as antioxidants by scavenging free radicals through their thiol-rich cysteine residues, thereby reducing oxidative damage—a key driver of aging. mtl-2 expression is upregulated under stress conditions and is regulated by the DAF-16/FOXO transcription factor, placing it downstream of the insulin/IGF-1 signaling pathway that is central to C. elegans longevity. By mitigating metal-induced proteotoxic and oxidative stress, mtl-2 is expected to support organismal healthspan and lifespan.",
"confidence": 0.62,
"key_pathways": [
"zinc/cadmium ion homeostasis",
"oxidative stress response",
"DAF-16/FOXO stress resistance signaling"
],
"mechanism_class": "other",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning is plausible on the surface (metallothioneins as antioxidants, DAF-16 regulation, zinc homeostasis), but it missed the actual experimental evidence that mtl-2 in C. elegans has an anti-longevity effect. The model's mechanistic reasoning about metallothioneins generally being protective is generic and not specific to the actual experimental findings for mtl-2. The model showed moderate confidence (0.62) in the wrong direction. The claim that mtl-2 is regulated by DAF-16/FOXO may have some basis, but the conclusion drawn from this (pro_longevity) is incorrect - being a DAF-16 target doesn't necessarily mean pro-longevity. The actual anti-longevity role of mtl-2 may relate to its role in sequestering zinc away from processes that require it, or other mechanisms that the model failed to consider.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}