nhx-2
C. elegans
Na(+)/H(+) exchanger protein 2
What the model saw
Gene: nhx-2 Organism: Caenorhabditis elegans Known functions: Na(+)/H(+) exchanger protein 2. antiporter activity. potassium:proton antiporter activity. sodium:proton antiporter activity.
View unredacted entry
Na(+)/H(+) exchanger protein 2. antiporter activity. potassium:proton antiporter activity. sodium:proton antiporter activity.
Solver output
NHX-2 is a Na⁺/H⁺ (and K⁺/H⁺) antiporter localized to the intestinal epithelium of C. elegans, where it regulates intracellular and luminal pH by exchanging sodium or potassium ions for protons. Proper pH homeostasis in the intestine is critical for nutrient absorption and lysosomal/vacuolar function, both of which feed into nutrient-sensing pathways such as mTORC1 and AMPK. Loss of nhx-2 has been shown to impair intestinal pH regulation, disrupt lysosomal acidification, and reduce lifespan in C. elegans, suggesting its normal activity supports cellular homeostasis. The maintenance of proton gradients by NHX-2 is also linked to mitochondrial function and energy metabolism, connecting it to the deregulated nutrient-sensing hallmark. Thus, the normal function of NHX-2 in sustaining ionic and pH balance in the intestine is expected to be pro-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 predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning is internally contradictory - it mentions that "loss of nhx-2 has been shown to impair intestinal pH regulation, disrupt lysosomal acidification, and reduce lifespan," which would actually support an anti_longevity classification (meaning nhx-2 loss reduces lifespan, so nhx-2 is pro_longevity). However, the ground truth says nhx-2 is anti_longevity, meaning its normal activity shortens lifespan (or its loss extends lifespan). The model then concludes pro_longevity based on this reasoning, which contradicts the actual experimental evidence. The model appears to have confused the direction of the effect - if nhx-2 is anti_longevity, then its loss or inhibition would extend lifespan. The model's mechanistic reasoning about pH homeostasis and nutrient sensing is plausible but leads to the wrong conclusion. The confidence of 0.62 is moderate but still wrong.
Raw API responses
solver
{
"reasoning": "NHX-2 is a Na⁺/H⁺ (and K⁺/H⁺) antiporter localized to the intestinal epithelium of C. elegans, where it regulates intracellular and luminal pH by exchanging sodium or potassium ions for protons. Proper pH homeostasis in the intestine is critical for nutrient absorption and lysosomal/vacuolar function, both of which feed into nutrient-sensing pathways such as mTORC1 and AMPK. Loss of nhx-2 has been shown to impair intestinal pH regulation, disrupt lysosomal acidification, and reduce lifespan in C. elegans, suggesting its normal activity supports cellular homeostasis. The maintenance of proton gradients by NHX-2 is also linked to mitochondrial function and energy metabolism, connecting it to the deregulated nutrient-sensing hallmark. Thus, the normal function of NHX-2 in sustaining ionic and pH balance in the intestine is expected to be pro-longevity.",
"confidence": 0.62,
"key_pathways": [
"intestinal pH homeostasis",
"lysosomal acidification and mTORC1 nutrient sensing",
"Na+/H+ antiporter-mediated ion homeostasis"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model predicted pro_longevity but the ground truth is anti_longevity. The model's reasoning is internally contradictory - it mentions that \"loss of nhx-2 has been shown to impair intestinal pH regulation, disrupt lysosomal acidification, and reduce lifespan,\" which would actually support an anti_longevity classification (meaning nhx-2 loss reduces lifespan, so nhx-2 is pro_longevity). However, the ground truth says nhx-2 is anti_longevity, meaning its normal activity shortens lifespan (or its loss extends lifespan). The model then concludes pro_longevity based on this reasoning, which contradicts the actual experimental evidence. The model appears to have confused the direction of the effect - if nhx-2 is anti_longevity, then its loss or inhibition would extend lifespan. The model's mechanistic reasoning about pH homeostasis and nutrient sensing is plausible but leads to the wrong conclusion. The confidence of 0.62 is moderate but still wrong.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 2,
"ground_truth_questionable": false
}