Genetic Heterogeneity of Motor Neuropathies

Overview

Journal Neurology

Specialty Neurology

Date 2017 Mar 3

PMID 28251916

Citations 41

Authors

Boglarka Bansagi

Helen Griffin

Roger G Whittaker

Thalia Antoniadi

Teresinha Evangelista

James Miller

Mark Greenslade

Natalie Forester

Jennifer Duff

Anna Bradshaw

Stephanie Kleinle

Veronika Boczonadi

Hannah Steele

Venkateswaran Ramesh

Edit Franko

Angela Pyle

Hanns Lochmuller

Patrick F Chinnery

Rita Horvath

Affiliations

Soon will be listed here.

Abstract

Objective: To study the prevalence, molecular cause, and clinical presentation of hereditary motor neuropathies in a large cohort of patients from the North of England.

Methods: Detailed neurologic and electrophysiologic assessments and next-generation panel testing or whole exome sequencing were performed in 105 patients with clinical symptoms of distal hereditary motor neuropathy (dHMN, 64 patients), axonal motor neuropathy (motor Charcot-Marie-Tooth disease [CMT2], 16 patients), or complex neurologic disease predominantly affecting the motor nerves (hereditary motor neuropathy plus, 25 patients).

Results: The prevalence of dHMN is 2.14 affected individuals per 100,000 inhabitants (95% confidence interval 1.62-2.66) in the North of England. Causative mutations were identified in 26 out of 73 index patients (35.6%). The diagnostic rate in the dHMN subgroup was 32.5%, which is higher than previously reported (20%). We detected a significant defect of neuromuscular transmission in 7 cases and identified potentially causative mutations in 4 patients with multifocal demyelinating motor neuropathy.

Conclusions: Many of the genes were shared between dHMN and motor CMT2, indicating identical disease mechanisms; therefore, we suggest changing the classification and including dHMN also as a subcategory of Charcot-Marie-Tooth disease. Abnormal neuromuscular transmission in some genetic forms provides a treatable target to develop therapies.

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