Mutation analysis of the G4.5 gene in patients with isolated left ventricular noncompaction.
Mutations in the gene G4.5, originally associated with Barth syndrome, have been reported to result in a wide spectrum of severe infantile X-linked cardiomyopathies. The purpose of this study was to investigate patients with isolated left ventricular noncompaction (LVNC) for disease-causing mutations in G4.5. In 27 patients including 10 families with isolated LVNC, mutation analysis of G4.5 was performed using single-strand DNA conformation polymorphism (SSCP) analysis and DNA sequencing. A novel splice acceptor site mutation of intron 8 of G4.5 was identified in a family with severe infantile X-linked LVNC without the usual findings of Barth syndrome. This mutation results in deletion of exon 9 from the mRNA, and is predicted to significantly disrupt the protein product. Genotype-phenotype correlation of G4.5 mutations in all 38 cases reported in the literature to date revealed that there was no correlation between location or type of mutation and either cardiac phenotype or disease severity. We suggest that males presenting with cardiomyopathy, particularly during infancy, even in the absence of the typical signs of Barth syndrome, should be evaluated for mutations in G4.5.
Chen
Rui
R
Department of Pediatrics, Toyama Medical and Pharmaceutical University, 2630 Sugitani, Toyama 930-0194, Japan.
Tsuji
Tohru
T
Ichida
Fukiko
F
Bowles
Karla R
KR
Yu
Xianyi
X
Watanabe
Sayaka
S
Hirono
Keiichi
K
Tsubata
Shinichi
S
Hamamichi
Yuji
Y
Ohta
Jun
J
Imai
Yasuharu
Y
Bowles
Neil E
NE
Miyawaki
Toshio
T
Towbin
Jeffrey A
JA
D000217:Acyltransferases; D009202:Cardiomyopathies / Q000235:genetics; D004252:DNA Mutational Analysis; D005260:Female; D040181:Genetic Diseases, X-Linked; D005838:Genotype; D006801:Humans; D017379:Hypertrophy, Left Ventricular / Q000235:genetics* / Q000503:physiopathology; D008297:Male; D010375:Pedigree; D010641:Phenotype; D018807:Polymorphism, Single-Stranded Conformational; D011506:Proteins / Q000235:genetics*; D012323:RNA Processing, Post-Transcriptional / Q000235:genetics; D014157:Transcription Factors
D011506:Proteins; D014157:Transcription Factors; D000217:Acyltransferases; C108675:TAFAZZIN protein, human