α-Tubulin

α-Tubulin partners with β-tubulin to form α/β-tubulin heterodimers that assemble microtubules, supporting cell division, intracellular transport, neuronal migration, and cytoskeletal organization^[1]. Mechanistically, TUBA1A is central to brain development because it is the most prevalent α-tubulin gene expressed in post-mitotic neurons^[1]. In disease models, mutations in α-tubulin cause abnormal neuronal migration in mice and lissencephaly in humans^[2]. Clinical studies further show that TUBA1A mutations cause a wide spectrum of lissencephaly and suggest that multiple neuronal migration pathways converge on α-tubulins^[3]. At the molecular level, TUBA1A R402 mutations dominantly disrupt cortical neuronal migration and selectively impair dynein motor activity^[4]. Compared with related isoforms, TUBA1A shows strong neuronal relevance, whereas TUBA8 was described as a tissue-specific α-tubulin isoform conserved in human and mouse^[1][5]. For experimental applications, TUBA1A variants provide models for testing how microtubule dynamics, XMAP215/Stu2 regulation, trafficking, synaptic maintenance, and axon guidance shape neurodevelopmental phenotypes^[6][7][8]. Tubulin inhibitors remain useful research tools because colchicine-site ligands bind tubulin and interfere with microtubule assembly^[9].

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