Clinical utility of RNA sequencing to resolve unusual GNE myopathy with a novel promoter deletion.

Abstract:

INTRODUCTION:UDP N-acetylglucosamine2-epimerase/N-acetylmannosamine-kinase (GNE) gene mutations can cause mostly autosomal-recessive myopathy with juvenile-onset known as hereditary inclusion-body myopathy (HIBM). METHODS:We describe a family of a patient showing an unusual HIBM with both vacuolar myopathy and myositis without quadriceps-sparing, hindering diagnosis. We show how genetic testing with functional assays, clinical transcriptome sequencing (RNA-seq) in particular, helped facilitate both the diagnosis and a better understanding of the genotype-phenotype relationship. RESULTS:We identified a novel 7.08 kb pathogenic deletion upstream of GNE using array comparative genomic hybridization (aCGH) and a common Val727Met variant. Using RNA-seq, we found only monoallelic (Val727Met-allele) expression, leading to ~50% GNE reduction in muscle. Importantly, α-dystroglycan is hypoglycosylated in the patient muscle, suggesting HIBM could be a "dystroglycanopathy." CONCLUSIONS:Our study shows the importance of considering aCGH for GNE-myopathies, and the potential of RNA-seq for faster, definitive molecular diagnosis of unusual myopathies. Muscle Nerve, 2019.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Chakravorty S,Berger K,Arafat D,Nallamilli BRR,Subramanian HP,Joseph S,Anderson ME,Campbell KP,Glass J,Gibson G,Hegde M

doi

10.1002/mus.26486

subject

Has Abstract

pub_date

2019-07-01 00:00:00

pages

98-103

issue

1

eissn

0148-639X

issn

1097-4598

journal_volume

60

pub_type

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