This is a mechanism module, not a specific disease. Disorder entries reference individual nodes via conforms_to (e.g., "deregulated_nutrient_sensing#mTORC1 Hyperactivation"). Conforming nodes in disorder files should include the corresponding biological processes and causal edges, specialized to their disease context. The module is intentionally kept lean: it captures the conserved anabolic-vs-catabolic nutrient-sensing imbalance, its convergence on autophagy suppression, and the geroprotector drug-target pattern (rapamycin and metformin both restrain the anabolic mTORC1 node via target_mechanisms), but deliberately does NOT embed disease-specific or contested downstream theories (e.g. tissue-specific mTOR-driven pathologies, or the antagonistic-pleiotropy debate on whether mTOR inhibition trades growth for longevity). Such specific or context-dependent claims belong on the relevant disorder or comorbidity/trajectory entry, which may conforms_to or reference this module. Complements the cellular_senescence module (another antagonistic hallmark of aging): deregulated nutrient sensing is one of several senescence-inducing stresses, and both converge on age-related tissue dysfunction. Key conformance target: "deregulated_nutrient_sensing#mTORC1 Hyperactivation".
Nutrient Surplus and Anabolic Signaling
trigger
A sustained state of nutrient and growth-factor abundance keeps the anabolic arm of the nutrient-sensing network engaged: the somatotroph GH/IGF-1 axis and amino-acid/nutrient sensing upstream of mTORC1. Because reducing the activity of these nutrient-sensing pathways (by dietary restriction, mutation, or chemical inhibitors) extends lifespan and lowers age-related disease, their chronic engagement is the initiating driver of the deregulated-nutrient-sensing hallmark.
Downstream
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mTORC1 Hyperactivation
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AMPK and Sirtuin Catabolic-Sensing Attenuation
mTORC1 Hyperactivation
central effector
Persistent nutrient and growth-factor input drives chronic activation of mTOR complex 1 (mTORC1), the master anabolic sensor that couples nutrient availability to cell growth, protein translation, and biosynthesis. Because inhibition of the mTOR pathway extends lifespan across model organisms and protects against a growing list of age-related pathologies, its age-associated hyperactivation is the central effector of this hallmark and the node targeted by rapamycin and (indirectly, via AMPK) metformin. This is the conserved central node that disease-specific mTOR-activating lesions converge upon.
Downstream
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Autophagy Suppression and Anabolic Bias
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Accelerated Cellular Aging and Age-Related Tissue Decline
AMPK and Sirtuin Catabolic-Sensing Attenuation
effector
In parallel with anabolic hyperactivation, the catabolic low-energy sensors that oppose mTORC1 - AMP-activated protein kinase (AMPK, which senses a low energy/high-AMP state) and the NAD+-dependent sirtuins - are relatively attenuated in the nutrient-replete aging state. These sensors normally drive the protective, pro-longevity response to nutrient scarcity (the mechanism engaged by dietary restriction, Sirtuin 1 activation, and metformin), so their reduced activity reinforces the anabolic bias and its downstream consequences.
Downstream
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Autophagy Suppression and Anabolic Bias
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Accelerated Cellular Aging and Age-Related Tissue Decline
Autophagy Suppression and Anabolic Bias
amplifier
Active mTORC1 suppresses macroautophagy, while attenuated AMPK/sirtuin signaling fails to induce it. Autophagy is the cytoplasmic recycling process that clears damaged organelles and proteins; its induction by starvation or genetic inactivation of nutrient signaling counteracts the age-associated accumulation of cellular damage. When nutrient signaling holds autophagy suppressed, this quality-control capacity is lost and damaged components accumulate - the amplifying step that links deregulated nutrient sensing to tissue decline.
Downstream
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Accelerated Cellular Aging and Age-Related Tissue Decline