A missense mutation in exon 13 of the β-myosin heavy chain gene is expressed alongside the normal allele in messenger RNA isolated from the myocardium of a patient with hypertrophic cardiomyopathy.
Observational (n=15)
No
This study provides the first evidence that a missense mutation in the beta-myosin heavy chain gene is actively transcribed into mRNA in the myocardium of a patient with hypertrophic cardiomyopathy.
We have determined that a missense mutation in exon 13 of the beta-myosin heavy chain (beta MHC) gene is expressed in the messenger RNA (mRNA) isolated from a right ventricular endomyocardial biopsy obtained from the proband of a family with hypertrophic cardiomyopathy. The mutation is the result of a substitution of an adenine for a guanine residue in one allele of the beta MHC gene and creates a second recognition site for the restriction endonuclease Ddel in exon 13. The mutation is inherited in a Mendelian fashion and co-segregates with hypertrophic cardiomyopathy in this family. Complementary DNAs synthesized from RNA isolated from the endomyocardial biopsy were cloned into a plasmid vector and sequenced to confirm the expression of both the normal and mutant allele in mRNA of myocardial tissue. This is the first report of the transcription of a mutant beta MHC gene allele into mRNA of the myocardium.
Perryman et al. (1992) conducted an observational in Hypertrophic cardiomyopathy (n=15). A missense mutation in exon 13 of the β-myosin heavy chain gene is expressed alongside the normal allele in messenger RNA isolated from the myocardium of a patient with hypertrophic cardiomyopathy.