Pappa
M. musculus
pregnancy-associated plasma protein A
What the model saw
Gene: Pappa Organism: Mus musculus Known functions: pregnancy-associated plasma protein A. pappalysin-1. endopeptidase activity. metalloendopeptidase activity. metallopeptidase activity.
View unredacted entry
pregnancy-associated plasma protein A. pappalysin-1. endopeptidase activity. metalloendopeptidase activity. metallopeptidase activity.
Solver output
PAPPA (pappalysin-1) is a metalloprotease that cleaves insulin-like growth factor binding proteins (IGFBPs), particularly IGFBP-4 and IGFBP-5, thereby releasing bound IGF-1 and increasing local IGF-1 bioavailability. Loss of PAPPA function reduces IGF-1 signaling, which is well-established to extend lifespan in multiple model organisms including mice. Pappa knockout mice have been shown to live significantly longer than wild-type controls, phenocopying other IGF-1/insulin signaling pathway mutants. The mechanism maps directly to the deregulated nutrient sensing hallmark, as the IGF-1/PI3K/AKT/FOXO axis is a central longevity-regulating pathway. Thus, the normal function of PAPPA (promoting IGF-1 signaling) is anti-longevity, meaning its loss is pro-longevity — but the gene's normal function itself opposes 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 correctly identifies the mechanism (PAPPA cleaves IGFBPs to release IGF-1, and PAPPA knockout mice live longer), but then contradicts itself in its final classification. The model correctly states that "the gene's normal function itself opposes longevity" — which means PAPPA is anti_longevity — but then labels it as "pro_longevity" in its prediction field. The ground truth is "anti_longevity." The model's reasoning actually arrives at the correct conclusion (PAPPA's normal function is anti-longevity), but the final answer label is wrong. This is a classic case of correct mechanistic reasoning leading to the wrong final answer label, likely due to confusion about the directionality of the classification (gene function vs. knockout effect).
Raw API responses
solver
{
"reasoning": "PAPPA (pappalysin-1) is a metalloprotease that cleaves insulin-like growth factor binding proteins (IGFBPs), particularly IGFBP-4 and IGFBP-5, thereby releasing bound IGF-1 and increasing local IGF-1 bioavailability. Loss of PAPPA function reduces IGF-1 signaling, which is well-established to extend lifespan in multiple model organisms including mice. Pappa knockout mice have been shown to live significantly longer than wild-type controls, phenocopying other IGF-1/insulin signaling pathway mutants. The mechanism maps directly to the deregulated nutrient sensing hallmark, as the IGF-1/PI3K/AKT/FOXO axis is a central longevity-regulating pathway. Thus, the normal function of PAPPA (promoting IGF-1 signaling) is anti-longevity, meaning its loss is pro-longevity — but the gene's normal function itself opposes longevity.",
"confidence": 0.85,
"key_pathways": [
"IGF-1 signaling / IGFBP proteolysis",
"PI3K/AKT/FOXO longevity axis",
"insulin/IGF-1 nutrient sensing pathway"
],
"mechanism_class": "deregulated_nutrient_sensing",
"longevity_influence": "pro_longevity"
}advisor
{
"notes": "The model correctly identifies the mechanism (PAPPA cleaves IGFBPs to release IGF-1, and PAPPA knockout mice live longer), but then contradicts itself in its final classification. The model correctly states that \"the gene's normal function itself opposes longevity\" — which means PAPPA is anti_longevity — but then labels it as \"pro_longevity\" in its prediction field. The ground truth is \"anti_longevity.\" The model's reasoning actually arrives at the correct conclusion (PAPPA's normal function is anti-longevity), but the final answer label is wrong. This is a classic case of correct mechanistic reasoning leading to the wrong final answer label, likely due to confusion about the directionality of the classification (gene function vs. knockout effect).",
"failure_mode": "right_answer_wrong_reasoning",
"answer_correct": false,
"mechanism_correct": true,
"reasoning_quality": 3,
"ground_truth_questionable": false
}