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This compartmentalization is usually reinforced through activity-dependent remodeling of spine geometry, cytoskeletal scaffolds, calcium handling, and local protein synthesis, allowing plasticity signals to remain localized and terminate appropriately. Here, a unifying framework is proposed in which neurodegenerative diseases emerge when the capacity to maintain and renew these compartments declines. Ageing and glial dysregulation may act as major biological drivers of this process by altering dendritic spine structure, calcium homeostasis, metabolic support, neurotransmitter clearance, and activity-dependent synaptic remodeling. In this state, plasticity induction remains largely preserved, but signaling becomes spatially diffuse and temporally prolonged, imposing chronic structural and energetic stress on synapses and axons. Proteins such as tau and alpha synuclein, which normally support cytoskeletal organization and dynamic phase separated assemblies, may become destabilized under these conditions leading to pathological aggregation. This framework provides an explanation for early synaptic dysfunction, selective neuronal vulnerability, long presymptomatic phases, network-level disease propagation, the protective effects of education and cognitive engagement, and the limited efficacy of proteinopathy centric therapeutic strategies. Neurodegeneration may be conceptualized as a failure of synaptic compartmentalization, with protein aggregation arising downstream of this primary vulnerability.<\/jats:p>","DOI":"10.1177\/13872877261449379","type":"journal-article","created":{"date-parts":[[2026,5,9]],"date-time":"2026-05-09T07:03:36Z","timestamp":1778310216000},"page":"93-103","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["A novel synaptic compartmentalization failure framework for neurodegeneration"],"prefix":"10.1177","volume":"112","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6260-1552","authenticated-orcid":false,"given":"Baikuntha","family":"Panigrahi","sequence":"first","affiliation":[{"name":"All India Institute of Medical Sciences, 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