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Overlapping cortical malformations and mutations in TUBB2B and TUBA1A

Cushion, Thomas D., Dobyns, William B., Mullins, Jonathan G. L., Stoodley, Neil, Chung, Seo-Kyung, Fry, Andrew Evan ORCID:, Hehr, Ute, Gunny, Roxana, Aylsworth, Arthur S., Prabhakar, Prab, Uyanik, Gokhan, Rankin, Julia, Rees, Mark I. and Pilz, Daniela T. 2013. Overlapping cortical malformations and mutations in TUBB2B and TUBA1A. Brain 136 (2) , pp. 536-548. 10.1093/brain/aws338

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Polymicrogyria and lissencephaly are causally heterogeneous disorders of cortical brain development, with distinct neuropathological and neuroimaging patterns. They can be associated with additional structural cerebral anomalies, and recurrent phenotypic patterns have led to identification of recognizable syndromes. The lissencephalies are usually single-gene disorders affecting neuronal migration during cerebral cortical development. Polymicrogyria has been associated with genetic and environmental causes and is considered a malformation secondary to abnormal post-migrational development. However, the aetiology in many individuals with these cortical malformations is still unknown. During the past few years, mutations in a number of neuron-specific α- and β-tubulin genes have been identified in both lissencephaly and polymicrogyria, usually associated with additional cerebral anomalies including callosal hypoplasia or agenesis, abnormal basal ganglia and cerebellar hypoplasia. The tubulin proteins form heterodimers that incorporate into microtubules, cytoskeletal structures essential for cell motility and function. In this study, we sequenced the TUBB2B and TUBA1A coding regions in 47 patients with a diagnosis of polymicrogyria and five with an atypical lissencephaly on neuroimaging. We identified four β-tubulin and two α-tubulin mutations in patients with a spectrum of cortical and extra-cortical anomalies. Dysmorphic basal ganglia with an abnormal internal capsule were the most consistent feature. One of the patients with a TUBB2B mutation had a lissencephalic phenotype, similar to that previously associated with a TUBA1A mutation. The remainder had a polymicrogyria-like cortical dysplasia, but the grey matter malformation was not typical of that seen in ‘classical’ polymicrogyria. We propose that the cortical malformations associated with these genes represent a recognizable tubulinopathy-associated spectrum that ranges from lissencephalic to polymicrogyric cortical dysplasias, suggesting shared pathogenic mechanisms in terms of microtubular function and interaction with microtubule-associated proteins.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Subjects: Q Science > QH Natural history > QH426 Genetics
R Medicine > R Medicine (General)
Uncontrolled Keywords: Lissencephaly; polymicrogyria; Corpus callosum; Tubulinopathy; Neuronal migration
Publisher: Oxford University Press
ISSN: 0006-8950
Last Modified: 06 Jul 2023 01:39

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