Mutational screening of phospholamban gene in hypertrophic and idiopathic dilated cardiomyopathy and functional study of the PLN-42 C > G mutation

作者：Medin Mania; Hermida Prieto Manuel; Monserrat Lorenzo^*; Laredo Rafael; Rodriguez Rey Jose Carlos; Fernandez Xusto; Castro Beiras Alfonso

来源：European Journal of Heart Failure, 2007, 9(1): 37-43.

DOI：10.1016/j.ejheart.2006.04.007

• phospholamban
• mutation
• promoter region
• hypertrophic cardiomyopathy

Background: Phospholarnban is an endogenous sarcoplasmic reticulum calcium ATPase inhibitor with a regulatory effect on cardiac contraction/relaxation coupling. Mutations in the phospholamban gene (PLN) have been associated with primary cardiomyopathies.
Aims: To screen for PLN mutations in our population of patients with primary cardiomyopathies and to perform functional analysis of the mutations identified.
Methods: We performed SSCP mutational screening and DNA sequencing of the PLN gene in 186 patients with either hypertrophic or dilated cardiomyopathy. To study promoter strength we constructed reporter plasmids containing the luciferase gene and performed transient transfection analysis in C6 and C2Cl2 cell lines.
Results: The PLN -42 C > G mutation was found in one patient with late onset familial apical hypertrophic cardiornyopathy. This mutation decreased phospholamban promoter activity by 43% and 47%, in C6 and C2C12 cell lines respectively. One son had mild apical hypertrophic cardiornyopathy and carried the mutation, another son with normal ECG and echocardiogram also had the mutation.
Conclusion: The PLN -42 C > G mutation is associated with a benign form of apical hypertrophic cardiornyopathy in this family, though the presence of a healthy adult carrier suggests that other genetic and environmental factors could be involved. Other-wise, mutations in the PLN gene are not a frequent cause of cardiomyopathies in our population.

• 出版日期2007-1