Tubulin beta-4A chain (TUBB4A) (TUBB4A)

Tubulin beta-4A chain (TUBB4A) is a structural protein that serves as a fundamental component of microtubules, which are essential for maintaining cellular architecture, facilitating intracellular transport, and enabling chromosome segregation during mitosis. It forms heterodimers with alpha-tubulin, which then polymerize into the hollow tubes that constitute the cytoskeleton. TUBB4A is highly expressed in the central nervous system, particularly in the basal ganglia and cerebellum, where it is critical for the development and maintenance of white matter and myelin. Mutations in the TUBB4A gene are the primary cause of several neurodevelopmental and neurodegenerative disorders, most notably hypomyelination with atrophy of the basal ganglia and cerebellum (H-ABC) and hereditary whispering dysphonia (DYT4). In the context of oncology, TUBB4A is a target for microtubule-targeting agents (MTAs), including taxanes and vinca alkaloids, which interfere with microtubule dynamics to trigger cell cycle arrest and apoptosis. Furthermore, aberrant expression of TUBB4A has been linked to tumor progression and resistance to chemotherapy in various cancers, such as melanoma and non-small cell lung cancer.

Other names

TUBB4TUBB5TBB4ADystonia 4DYT4Tubulin beta-4A class IVaTubulin beta-4 chain

Microtubule-targeting agents bind to specific sites on the beta-tubulin subunit to either stabilize (e.g., taxanes) or destabilize (e.g., vinca alkaloids) microtubules, thereby disrupting the dynamic instability required for mitotic spindle formation and leading to cell cycle arrest and apoptosis.