Mgat5
M. musculus
mannoside acetylglucosaminyltransferase 5
What the model saw
Gene: Mgat5 Organism: Mus musculus Known functions: mannoside acetylglucosaminyltransferase 5. alpha-1,6-mannosylglycoprotein 6-beta-N-acetylglucosaminyltransferase A. acetylglucosaminyltransferase activity. alpha-1,6-mannosylglycoprotein 6-beta-N-acetylglucosaminyltransferase activity. glycosyltransferase activity. manganese ion binding. protein phosphatase inhibitor activity.
View unredacted entry
mannoside acetylglucosaminyltransferase 5. alpha-1,6-mannosylglycoprotein 6-beta-N-acetylglucosaminyltransferase A. acetylglucosaminyltransferase activity. alpha-1,6-mannosylglycoprotein 6-beta-N-acetylglucosaminyltransferase activity. glycosyltransferase activity. manganese ion binding. protein phosphatase inhibitor activity.
Solver output
Mgat5 encodes the Golgi enzyme GlcNAc-transferase V (GnT-V), which catalyzes the addition of β1,6-GlcNAc branches to N-glycans on cell surface and secreted glycoproteins. This branching modification enhances the retention of growth factor receptors (e.g., EGFR, TGF-β receptor) and integrins at the cell surface by forming galectin lattices, thereby amplifying pro-growth and pro-inflammatory signaling. Elevated Mgat5 activity promotes oncogenic signaling, tumor progression, and chronic inflammatory cascades — all of which are associated with reduced healthspan and lifespan. Additionally, its protein phosphatase inhibitor activity could further dysregulate phosphorylation-dependent signaling networks. Loss of Mgat5 in mice has been shown to reduce susceptibility to cancer and dampen inflammatory signaling, suggesting the normal function of this gene is detrimental to 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 anti_longevity but the ground truth is pro_longevity. The model's reasoning is internally coherent and draws on real biology (GnT-V, galectin lattices, growth factor receptor retention), but it reaches the wrong conclusion. The model argues that Mgat5 promotes oncogenic and inflammatory signaling, making it detrimental to longevity. However, the GenAge database classifies Mgat5 as pro_longevity in mice. Research has shown that Mgat5 deficiency in mice actually accelerates aging-related phenotypes (e.g., autoimmunity, inflammatory disease), while Mgat5 expression supports immune homeostasis and tissue maintenance. The model's framing of Mgat5 as purely pro-tumorigenic/pro-inflammatory misses the broader context in which Mgat5 activity supports longevity through immune regulation and receptor signaling balance. The confidence of 0.65 is moderate but still wrong. The mechanistic reasoning, while plausible in isolation, leads to an incorrect conclusion about the net longevity effect.
Raw API responses
solver
{
"reasoning": "Mgat5 encodes the Golgi enzyme GlcNAc-transferase V (GnT-V), which catalyzes the addition of β1,6-GlcNAc branches to N-glycans on cell surface and secreted glycoproteins. This branching modification enhances the retention of growth factor receptors (e.g., EGFR, TGF-β receptor) and integrins at the cell surface by forming galectin lattices, thereby amplifying pro-growth and pro-inflammatory signaling. Elevated Mgat5 activity promotes oncogenic signaling, tumor progression, and chronic inflammatory cascades — all of which are associated with reduced healthspan and lifespan. Additionally, its protein phosphatase inhibitor activity could further dysregulate phosphorylation-dependent signaling networks. Loss of Mgat5 in mice has been shown to reduce susceptibility to cancer and dampen inflammatory signaling, suggesting the normal function of this gene is detrimental to longevity.",
"confidence": 0.65,
"key_pathways": [
"N-glycan branching / galectin lattice signaling",
"growth factor receptor retention (EGFR, TGF-β)",
"pro-inflammatory cytokine and integrin signaling"
],
"mechanism_class": "altered_intercellular_communication",
"longevity_influence": "anti_longevity"
}advisor
{
"notes": "The model predicted anti_longevity but the ground truth is pro_longevity. The model's reasoning is internally coherent and draws on real biology (GnT-V, galectin lattices, growth factor receptor retention), but it reaches the wrong conclusion. The model argues that Mgat5 promotes oncogenic and inflammatory signaling, making it detrimental to longevity. However, the GenAge database classifies Mgat5 as pro_longevity in mice. Research has shown that Mgat5 deficiency in mice actually accelerates aging-related phenotypes (e.g., autoimmunity, inflammatory disease), while Mgat5 expression supports immune homeostasis and tissue maintenance. The model's framing of Mgat5 as purely pro-tumorigenic/pro-inflammatory misses the broader context in which Mgat5 activity supports longevity through immune regulation and receptor signaling balance. The confidence of 0.65 is moderate but still wrong. The mechanistic reasoning, while plausible in isolation, leads to an incorrect conclusion about the net longevity effect.",
"failure_mode": "confident_wrong",
"answer_correct": false,
"mechanism_correct": false,
"reasoning_quality": 3,
"ground_truth_questionable": false
}