Skip to Main content Skip to Navigation
Journal articles

Mutations in tubulin genes are frequent causes of various foetal malformations of cortical development including microlissencephaly

Abstract : Complex cortical malformations associated with mutations in tubulin genes are commonly referred to as "Tubulinopathies". To further characterize the mutation frequency and phenotypes associated with tubulin mutations, we studied a cohort of 60 foetal cases. Twenty-six tubulin mutations were identified, of which TUBA1A mutations were the most prevalent (19 cases), followed by TUBB2B (6 cases) and TUBB3 (one case). Three subtypes clearly emerged. The most frequent (n = 13) was microlissencephaly with corpus callosum agenesis, severely hypoplastic brainstem and cerebellum. The cortical plate was either absent (6/13), with a 2–3 layered pattern (5/13) or less frequently thickened (2/13), often associated with neuroglial overmigration (4/13). All cases had voluminous germinal zones and ganglionic eminences. The second subtype was lissencephaly (n = 7), either classical (4/7) or associated with cerebellar hypoplasia (3/7) with corpus callosum agenesis (6/7). All foetuses with lissencephaly and cerebellar hypoplasia carried distinct TUBA1A mutations, while those with classical lissencephaly harbored recurrent mutations in TUBA1A (3 cases) or TUBB2B (1 case). The third group was polymicrogyria-like cortical dysplasia (n = 6), consisting of asymmetric multifocal or generalized polymicrogyria with inconstant corpus callosum agenesis (4/6) and hypoplastic brainstem and cerebellum (3/6). Polymicrogyria was either unlayered or 4-layered with neuronal heterotopias (5/6) and occasional focal neuroglial overmigration (2/6). Three had TUBA1A mutations and 3 TUBB2B mutations. Foetal TUBA1A tubulinopathies most often consist in microlissencephaly or classical lissencephaly with corpus callosum agenesis, but polymicrogyria may also occur. Conversely, TUBB2B mutations are responsible for either polymicrogyria (4/6) or microlissencephaly (2/6).
Document type :
Journal articles
Complete list of metadatas

Cited literature [64 references]  Display  Hide  Download

https://www.hal.inserm.fr/inserm-01089369
Contributor : Mireille Bos <>
Submitted on : Monday, December 1, 2014 - 3:45:14 PM
Last modification on : Monday, August 31, 2020 - 4:24:15 PM
Long-term archiving on: : Saturday, April 15, 2017 - 2:35:14 AM

File

2051-5960-2-69.pdf
Publisher files allowed on an open archive

Identifiers

Citation

Catherine Fallet-Bianco, Annie Laquerrière, Karine Poirier, Ferechte Razavi, Fabien Guimiot, et al.. Mutations in tubulin genes are frequent causes of various foetal malformations of cortical development including microlissencephaly. Acta Neuropathologica Communications, BioMed Central part of Springer Science, 2014, 2 (1), pp.69. ⟨10.1186/2051-5960-2-69⟩. ⟨inserm-01089369⟩

Share

Metrics

Record views

785

Files downloads

1194