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Mutations in the beta-tubulin gene TUBB2B result in asymmetrical polymicrogyria.

Abstract：

:Polymicrogyria is a relatively common but poorly understood defect of cortical development characterized by numerous small gyri and a thick disorganized cortical plate lacking normal lamination. Here we report de novo mutations in a beta-tubulin gene, TUBB2B, in four individuals and a 27-gestational-week fetus with bilateral asymmetrical polymicrogyria. Neuropathological examination of the fetus revealed an absence of cortical lamination associated with the presence of ectopic neuronal cells in the white matter and in the leptomeningeal spaces due to breaches in the pial basement membrane. In utero RNAi-based inactivation demonstrates that TUBB2B is required for neuronal migration. We also show that two disease-associated mutations lead to impaired formation of tubulin heterodimers. These observations, together with previous data, show that disruption of microtubule-based processes underlies a large spectrum of neuronal migration disorders that includes not only lissencephaly and pachygyria, but also polymicrogyria malformations.

journal_name

Nat Genet

journal_title

Nature genetics

authors

Jaglin XH,Poirier K,Saillour Y,Buhler E,Tian G,Bahi-Buisson N,Fallet-Bianco C,Phan-Dinh-Tuy F,Kong XP,Bomont P,Castelnau-Ptakhine L,Odent S,Loget P,Kossorotoff M,Snoeck I,Plessis G,Parent P,Beldjord C,Cardoso C,Repr

doi

10.1038/ng.380

subject

Has Abstract

pub_date

2009-06-01 00:00:00

pages

746-52

issue

6

eissn

1061-4036

issn

1546-1718

pii

ng.380

journal_volume

41

pub_type

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