OBJECTIVETo investigate the single nucleotide polymorphism (SNP) of the novel hyperplasia suppressor gene (HSG) to uncover the relationship between HSG SNP and hypertension.

METHODSTotally, 74 normotensive people (38 men and 36 women), 51 patients with essential hypertension (27 men and 24 women) and 20 hypertensive patients with family history of essential hypertension (9 men and 11 women) were chosen, with mean ages of (54 +/- 8) years, (57 +/- 8) years and (38 +/- 22) years, respectively. Peripheral venous blood specimen was collected from each of them and then DNA was extracted. The right primers were designed for DNA amplification with PCR. Each of the PCR-products from different groups was sequenced by ABI PRISM 377-DNA sequencer and their base components and characteristics of the same fragment were compared each other.

RESULTSBlood levels of creatinine (CRE) and urea nitrogen (BUN) were significantly higher in the hypertensives than in the normotensives (P < 0.01). Systolic and diastolic blood pressures were significantly higher in the hypertensives and the hypertensives with family history of essential hypertension than in the normotensives (P < 0.01 and P < 0.05). There existed three kinds of SNP in the HSG 12th intron (1q82139 G/A, 82153C/G and 82273G/-), and there was significant difference in 1q82153C/G and 82273G/- SNP between the hypertensives and normotensives (P < 0.05 and P < 0.01) and between the hypertensives with family history and the normotensives (P < 0.01 and P < 0.01). And, the similar difference in C/G allele and G deletion could be found in different populations. Moreover, the CC genetype of 1q82153 was common in the population (P < 0.01) and G deletion was more common in Chinese Han people with family history of essential hypertension. There was no significant difference existed in 1q82139 G/A mutation among the three groups.

CONCLUSIONSMeasurements of renal function indicators (CRE and BUN) could probably reflect earlier advance of hypertension and damage to target organs. There existed three kinds of mutation in the 12th intron of the HSG 1q82139 G/A, 82153 C/G and 82273 G/-. The 1q82139 G/A could be a nonsense mutation and there was significant difference in the 1q82153 C/G and 1q82273 G/- SNP and gene frequencies between different Chinese Han populations, which could be independent risk factors for essential hypertension.