Identification of a Novel TAZ Gene Mutation in a Family With X-Linked Dilated Cardiomyopathy Barth Syndrome

Abstract

Mutations in the tafazzin (TAZ) gene on chromosome Xq28 are responsible for the Barth syndrome (BTHS) phenotype resulting in a loss of function in the protein tafazzin involved in the transacylation of cardiolipin, an essential mitochondrial phospholipid. TAZ gene was investigated in the proband in our study, who died of dilated cardiomyopathy at 8 months of age, and his family by sequencing to identify the genetic cause of BTHS. Molecular analysis revealed a novel mutation in exon 5 (c.520T>G) of the TAZ gene. This novel mutation c.520T>G, pW174G, was also found in female carriers (mother and grandmother of proband) in the family. Bioinformatic analysis was carried out to examine the effect of mutation in the gene and confirmed the deleterious effect of this single mutation to the protein structure. Protein modeling and 3-dimensional structure of TAZ protein demonstrated the significantly visible changes in mutated protein leading to BTHS phenotype. Prenatal diagnosis in a subsequent pregnancy showed a carrier female, and pregnancy was continued. Child is doing well at 1 year of age.

Dilated cardiomyopathy in the era of precision medicine: latest concepts and developments

“…Frequency in patients with DCM [155] Inheritance pattern Phenotype [77,156] TTN [157] [165] (Myosin heavy chain 6, alpha) 4% AD AV conduction defects, sick sinus syndrome MYH7 [166] (Myosin heavy chain 7) 4% AD AV conduction defects may coexist with myopathy early onset TAZ [167] (Tafazzin) Unknown X-linked DCM with syndromic features: Barth syndrome (DCM, myopathy, neutropenia, short stature) TNNC1 [168] (Troponin C) < 1% AD TNNI3 [169] (Troponin I) < 1% AD, AR TNNT2 [166] (Troponin T) < 1% AD TPM1 [170] (Tropomyosin 1) < 1% AD LMNA [171]…”