1. GNB3 C825T Polymorphism and Myocardial Recovery in Peripartum Cardiomyopathy: Results of the Multicenter Investigations of Pregnancy-Associated Cardiomyopathy Study.
- Author
-
Sheppard R, Hsich E, Damp J, Elkayam U, Kealey A, Ramani G, Zucker M, Alexis JD, Horne BD, Hanley-Yanez K, Pisarcik J, Halder I, Fett JD, and McNamara DM
- Subjects
- Adult, Black or African American genetics, Canada epidemiology, Cardiomyopathies diagnosis, Cardiomyopathies enzymology, Cardiomyopathies ethnology, Cardiomyopathies physiopathology, Disease-Free Survival, Female, Gene Frequency, Genetic Association Studies, Genetic Predisposition to Disease, Humans, Peripartum Period, Phenotype, Pregnancy, Pregnancy Complications, Cardiovascular diagnosis, Pregnancy Complications, Cardiovascular enzymology, Pregnancy Complications, Cardiovascular ethnology, Pregnancy Complications, Cardiovascular physiopathology, Prevalence, Protective Factors, Recovery of Function, Risk Factors, Stroke Volume, Time Factors, United States epidemiology, Ventricular Function, Left, White People genetics, Young Adult, Cardiomyopathies genetics, Heterotrimeric GTP-Binding Proteins genetics, Polymorphism, Genetic, Pregnancy Complications, Cardiovascular genetics
- Abstract
Background: Black women are at greater risk for peripartum cardiomyopathy (PPCM). The guanine nucleotide-binding proteins β-3 subunit (GNB3) has a polymorphism C825T. The GNB3 TT genotype more prevalent in blacks is associated with poorer outcomes. We evaluated GNB3 genotype and myocardial recovery in PPCM., Methods and Results: A total of 97 women with PPCM were enrolled and genotyped for the GNB3 T/C polymorphism. Left ventricular ejection fraction (LVEF) was assessed by echocardiography at entry, 6 and 12 months postpartum. LVEF over time in subjects with the GNB3 TT genotype was compared with those with the C allele overall and in black and white subsets. The cohort was 30% black, age 30+6, LVEF 0.34+0.10 at entry 31+25 days postpartum. The % GNB3 genotype for TT/CT/CC=23/41/36 and differed markedly by race (blacks=52/38/10 versus whites=10/44/46, P<0.001). In subjects with the TT genotype, LVEF at entry was lower (TT=0.31+0.09; CT+CC=0.35+0.09, P=0.054) and this difference increased at 6 (TT=0.45+0.15; CT+CC=0.53+0.08, P=0.002) and 12 months (TT=0.45+0.15; CT+CC=0.56+0.07, P<0.001.). The difference in LVEF at 12 months by genotype was most pronounced in blacks (12 months LVEF for GNB3 TT=0.39+0.16; versus CT+CC=0.53+0.09, P=0.02) but evident in whites (TT=0.50++0.11; CT+CC=0.56+0.06, P=0.04)., Conclusions: The GNB3 TT genotype was associated with lower LVEF at 6 and 12 months in women with PPCM, and this was particularly evident in blacks. Racial differences in the prevalence and impact of GNB3 TT may contribute to poorer outcomes in black women with PPCM., (© 2016 American Heart Association, Inc.)
- Published
- 2016
- Full Text
- View/download PDF