Founder mutation causes classical Fukuyama congenital muscular dystrophy (FCMD) in Chinese patients.

Abstract:

PURPOSE:Fukuyama congenital muscular dystrophy (FCMD) is a congenital muscular dystrophy rarely reported outside Japan. Here, we report three patients with Fukuyama congenital muscular dystrophy (FCMD) in China who shared a similar clinical phenotype and 3-kb insertion in the FKTN 3' untranslated region. METHODS:Immunofluorescence staining was undertaken on muscle biopsies from three patients using alpha dystroglycan antibody (IIH6). Genomic DNA from patients and parents was extracted from peripheral blood leukocytes. Polymerase chain reaction and DNA sequencing were employed to analyze the exons and surrounding intron sequences of the fukutin (FKTN) gene to detect mutations. Haplotype analysis was also performed on each patient and their parents. RESULTS:All patients had delayed mental and motor development, febrile convulsions, muscle weakness, and moderate to significant raised levels of serum creatine kinase (7000-11,160 U/L, 25-60×normal). Brain MRI scans showed micropolygyria and extensive dysplasia in the white matter and brainstem. Electromyography revealed myopathic changes. Muscle immunofluorescence studies demonstrated reduced IIH6 staining. Genetic testing showed compound heterozygous mutations of FKTN. Cases 1 and 2 had a c.139C>T (p.Arg47(∗)) heterozygous mutation. Case 3 had a c.346C>T (p.Gln116(∗)) heterozygous mutation. CONCLUSION:All patients had a heterozygous 3-kb insertion in the FKTN 3' untranslated region. Haplotype analyses suggested that these patients had the same haplotype as Japanese patients.

journal_name

Brain Dev

journal_title

Brain & development

authors

Yang H,Kobayashi K,Wang S,Jiao H,Xiao J,Toda T,Wu X,Xiong H

doi

10.1016/j.braindev.2015.02.010

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

880-6

issue

9

eissn

0387-7604

issn

1872-7131

pii

S0387-7604(15)00035-2

journal_volume

37

pub_type

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