Variants in the genes DCTN2, DNAH10, LRIG3, and MYO1A are associated with intermediate Charcot-Marie-Tooth disease in a Norwegian family.

Abstract:

INTRODUCTION:Charcot-Marie-Tooth disease (CMT) is a heterogeneous inherited neuropathy. The number of known CMT genes is rapidly increasing mainly due to next-generation sequencing technology, at present more than 70 CMT-associated genes are known. We investigated whether variants in the DCTN2 could cause CMT. MATERIAL AND METHODS:Fifty-nine Norwegian CMT families from the general population with unknown genotype were tested by targeted next-generation sequencing (NGS) for variants in DCTN2 along with 32 CMT genes and 19 other genes causing other inherited neuropathies or neuronopathies, due to phenotypic overlap. In the family with the DCTN2 variant, exome sequencing was then carried out on all available eight family members to rule out the presence of more potential variants. RESULTS:Targeted NGS identified in one family a variant of DCTN2, c.337C>T, segregating with the phenotype in five affected members, while it was not present in the three unaffected members. The DCTN2 variant c.337C>T; p.(His113Tyr) was neither found in in-house controls nor in SNP databases. Exome sequencing revealed a singular heterozygous shared haplotype containing four genes, DCTN2, DNAH10, LRIG3, and MYO1A, with novel sequence variants. The haplotype was shared by all the affected members, while the unaffected members did not have it. CONCLUSIONS:This is the first time a haplotype on chromosome 12 containing sequence variants in the genes DCTN2, DNAH10, LRIG3, and MYO1A has been linked to an inherited neuropathy in humans.

journal_name

Acta Neurol Scand

authors

Braathen GJ,Høyer H,Busk ØL,Tveten K,Skjelbred CF,Russell MB

doi

10.1111/ane.12515

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

67-75

issue

1

eissn

0001-6314

issn

1600-0404

journal_volume

134

pub_type

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