Tubulin beta-6 chain

Tubulin beta-6 chain (TUBB6) is a major structural component of microtubules, heterodimeric polymers essential for cellular architecture and intracellular transport (UniProt: Q9BUF5). As a beta-tubulin isoform, it contributes to GTP-dependent microtubule polymerization and stabilization. TUBB6 is widely expressed across tissues and was identified in a congenital disorder characterized by facial palsy and velopharyngeal dysfunction (UniProt: Q9BUF5).

In the context of Alzheimer's Disease, TUBB6 expression is reduced in post-mortem AD brain tissue compared to age-matched controls (Chaparral AD proteomics). Proteomics analysis across subcellular fractions showed a mean log2 fold-change of −0.51, indicating consistent downregulation. Microtubule dynamics are critical for axonal transport and neuronal integrity; reduced tubulin levels may contribute to the pathological changes observed in AD neurodegeneration.