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Uner Tan syndrome caused by a homozygous TUBB2B mutation affecting microtubule stability.

Abstract：

:The integrity and dynamic properties of the microtubule cytoskeleton are indispensable for the development of the mammalian brain. Consequently, mutations in the genes that encode the structural component (the α/β-tubulin heterodimer) can give rise to severe, sporadic neurodevelopmental disorders. These are commonly referred to as the tubulinopathies. Here we report the addition of recessive quadrupedalism, also known as Uner Tan syndrome (UTS), to the growing list of diseases caused by tubulin variants. Analysis of a consanguineous UTS family identified a biallelic TUBB2B mutation, resulting in a p.R390Q amino acid substitution. In addition to the identifying quadrupedal locomotion, all three patients showed severe cerebellar hypoplasia. None, however, displayed the basal ganglia malformations typically associated with TUBB2B mutations. Functional analysis of the R390Q substitution revealed that it did not affect the ability of β-tubulin to fold or become assembled into the α/β-heterodimer, nor did it influence the incorporation of mutant-containing heterodimers into microtubule polymers. The 390Q mutation in S. cerevisiae TUB2 did not affect growth under basal conditions, but did result in increased sensitivity to microtubule-depolymerizing drugs, indicative of a mild impact of this mutation on microtubule function. The TUBB2B mutation described here represents an unusual recessive mode of inheritance for missense-mediated tubulinopathies and reinforces the sensitivity of the developing cerebellum to microtubule defects.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Breuss MW,Nguyen T,Srivatsan A,Leca I,Tian G,Fritz T,Hansen AH,Musaev D,McEvoy-Venneri J,James KN,Rosti RO,Scott E,Tan U,Kolodner RD,Cowan NJ,Keays DA,Gleeson JG

doi

10.1093/hmg/ddw383

subject

Has Abstract

pub_date

2017-01-15 00:00:00

pages

258-269

issue

2

eissn

0964-6906

issn

1460-2083

pii

ddw383

journal_volume

26

pub_type

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