Association between polymorphisms in non-muscle myosin heavy chain 9 gene and hypertension susceptibility in chronic kidney disease patients

Objective To explore the association between polymorphisms in non-muscle myosin heavy chain 9 gene (MYH9) and hypertension susceptibility in chronic kidney disease (CKD) patients. Methods Five hundred and ninety-five persons, including 301 patients with CKD and 294 healthy controls, were enrolled in the study. Two single nucleotide polymorphisms (SNPs) (rs3752462, rs4821480)were genotyped by TaqMan assay or a restriction fragment length polymorphism assay for a further case-control study. The discrepancies of the patients'quantitive traits (including age, sex, systolic and diastolic blood pressure, frequency of different primary diseases and using different kinds of antihypertensive drugs) among different genotypes of the two MYH9 SNPs were analyzed. Meanwhile,theassociation between polymorphisms in MYH9 and hypertension susceptibility in CKD patients were analyzed in the rs3752462 site. Results The systolic blood pressure of CT genotype patients(147.94±27.40) mm Hg] was significantly higher than that of CC genotype patients (136.43±19.09) mm Hg] by single factor analysis of variance (P＜0.05). The frequency of using all kinds of antihypertensive drugs for CC genotype patients (7.4%) was lower than that of TT (43.9%) and CT (48.7%) genotype patients (P＜0.05).After correcting the age factor, the result of Logistic regression analysis showed that CC genotype was a protective factor of systolic blood pressure increasing. The probability of high blood pressure for CT genotype patients with CKD was 0.175 times than that of CC genotype (95% CI 0.071,0.431). Conclusions The CKD patients who carry the rs3752462 site CC genotype of MYH9 gene are not prone to high blood pressure. Polymorphism of MYH9 gene rs3752462 site is associated with systolic blood pressure in CKD patients. It may indicate that allele C mutation for T can lead to the increase in systolic blood pressure.