mth
D. melanogaster
methuselah
What the model saw
Gene: mth Organism: Drosophila melanogaster Known functions: methuselah. G protein-coupled peptide receptor activity. G protein-coupled receptor activity. peptide binding. protein binding. transmembrane signaling receptor activity.
View unredacted entry
methuselah. G protein-coupled peptide receptor activity. G protein-coupled receptor activity. peptide binding. protein binding. transmembrane signaling receptor activity.
Solver output
The methuselah (mth) gene encodes a G protein-coupled receptor (GPCR) that mediates peptide ligand signaling. Loss-of-function mutations in mth are well-established to extend lifespan in Drosophila by ~35%, indicating that normal MTH signaling activity is anti-longevity. MTH functions as a receptor for stress-related peptides (including stunted/sun), coupling to G-protein pathways that modulate stress resistance and metabolic homeostasis. This GPCR signaling axis intersects with nutrient-sensing and insulin-like signaling networks; reduced MTH activity enhances oxidative stress resistance and broadly mimics the longevity benefits of attenuated nutrient/growth factor signaling. The receptor's role in transmembrane peptide signal transduction places it within the deregulated nutrient-sensing hallmark, analogous to other pro-aging GPCR/peptide hormone axes.
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 "anti_longevity" with high confidence (0.88), but the ground truth is "unclear." While the model's reasoning about mth loss-of-function extending lifespan (~35%) is based on real published findings (Lin et al. 1998), the GenAge database classifies this gene's longevity influence as "unclear," likely because subsequent studies have produced conflicting or nuanced results that complicate the original finding. The model is overconfident and presents a one-sided view of the literature. The mechanistic reasoning about GPCR signaling and stress resistance is partially correct based on the original studies, but the classification of the mechanism as "deregulated_nutrient_sensing" is a stretch — mth is more directly associated with stress response signaling than nutrient sensing per se. The model fails to acknowledge the uncertainty that led GenAge to classify this as "unclear."
Raw API responses
solver
{
"reasoning": "The methuselah (mth) gene encodes a G protein-coupled receptor (GPCR) that mediates peptide ligand signaling. Loss-of-function mutations in mth are well-established to extend lifespan in Drosophila by ~35%, indicating that normal MTH signaling activity is anti-longevity. MTH functions as a receptor for stress-related peptides (including stunted/sun), coupling to G-protein pathways that modulate stress resistance and metabolic homeostasis. This GPCR signaling axis intersects with nutrient-sensing and insulin-like signaling networks; reduced MTH activity enhances oxidative stress resistance and broadly mimics the longevity benefits of attenuated nutrient/growth factor signaling. The receptor's role in transmembrane peptide signal transduction places it within the deregulated nutrient-sensing hallmark, analogous to other pro-aging GPCR/peptide hormone axes.",
"confidence": 0.88,
"key_pathways": [
"G protein-coupled receptor signaling",
"insulin/IGF-like nutrient sensing",
"oxidative stress response"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model predicted \"anti_longevity\" with high confidence (0.88), but the ground truth is \"unclear.\" While the model's reasoning about mth loss-of-function extending lifespan (~35%) is based on real published findings (Lin et al. 1998), the GenAge database classifies this gene's longevity influence as \"unclear,\" likely because subsequent studies have produced conflicting or nuanced results that complicate the original finding. The model is overconfident and presents a one-sided view of the literature. The mechanistic reasoning about GPCR signaling and stress resistance is partially correct based on the original studies, but the classification of the mechanism as \"deregulated_nutrient_sensing\" is a stretch — mth is more directly associated with stress response signaling than nutrient sensing per se. The model fails to acknowledge the uncertainty that led GenAge to classify this as \"unclear.\"",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}