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Bi-allelic Pathogenic Variants in TUBGCP2 Cause Microcephaly and Lissencephaly Spectrum Disorders.

Abstract：

:Lissencephaly comprises a spectrum of malformations of cortical development. This spectrum includes agyria, pachygyria, and subcortical band heterotopia; each represents anatomical malformations of brain cortical development caused by neuronal migration defects. The molecular etiologies of neuronal migration anomalies are highly enriched for genes encoding microtubules and microtubule-associated proteins, and this enrichment highlights the critical role for these genes in cortical growth and gyrification. Using exome sequencing and family based rare variant analyses, we identified a homozygous variant (c.997C>T [p.Arg333Cys]) in TUBGCP2, encoding gamma-tubulin complex protein 2 (GCP2), in two individuals from a consanguineous family; both individuals presented with microcephaly and developmental delay. GCP2 forms the multiprotein γ-tubulin ring complex (γ-TuRC) together with γ-tubulin and other GCPs to regulate the assembly of microtubules. By querying clinical exome sequencing cases and through GeneMatcher-facilitated collaborations, we found three additional families with bi-allelic variation and similarly affected phenotypes including a homozygous variant (c.1843G>C [p.Ala615Pro]) in two families and compound heterozygous variants consisting of one missense variant (c.889C>T [p.Arg297Cys]) and one splice variant (c.2025-2A>G) in another family. Brain imaging from all five affected individuals revealed varying degrees of cortical malformations including pachygyria and subcortical band heterotopia, presumably caused by disruption of neuronal migration. Our data demonstrate that pathogenic variants in TUBGCP2 cause an autosomal recessive neurodevelopmental trait consisting of a neuronal migration disorder, and our data implicate GCP2 as a core component of γ-TuRC in neuronal migrating cells.

journal_name

Am J Hum Genet

journal_title

American journal of human genetics

authors

Mitani T,Punetha J,Akalin I,Pehlivan D,Dawidziuk M,Coban Akdemir Z,Yilmaz S,Aslan E,Hunter JV,Hijazi H,Grochowski CM,Jhangiani SN,Karaca E,Fatih JM,Iwanowski P,Gambin T,Wlasienko P,Goszczanska-Ciuchta A,Bekiesinska-Fi

doi

10.1016/j.ajhg.2019.09.017

subject

Has Abstract

pub_date

2019-11-07 00:00:00

pages

1005-1015

issue

5

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(19)30357-X

journal_volume

105

pub_type

杂志文章

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