title: Common genetic variants in the chromogranin a promoter are associated with renal injury in IgA nephropathy patients with malignant hypertension.
abstract: The present study aimed to investigate whether genetic variants in the chromogranin A (CHGA) promoter were associated with malignant hypertension (MHT) and renal functional damage. The polymorphisms of CHGA promoter in 39 patients with malignant hypertension secondary to idiopathic IgA nephropathy (IgAN-MHT), 23 patients with primary malignant hypertension and 63 controls were genotyped by sequencing. Four diploid genotypes with minor allele frequencies of approximately >or=10% for individual CHGA SNP loci or haplotypes were compared among the patient with IgAN-MHT, primary MHT and healthy control. Polymorphisms and haplotypes of CHGA promoter were not associated with primary MHT and IgAN-MHT. Within 39 IgAN-MHT patients whose clinical and histological data were available, patients carrying -415TT genotype tended to present with higher serum creatinine (Scr) level than those carrying -415TC/CC genotype (636.94 +/- 524.07 micromol/L vs 277.84 +/- 196.39 micromol/L, P = 0.014). Consistent with this statistic, we found the haplotype-specific score value of haplotype ATC was 2.25046 (p = 0.024), and by permutation testing, the empirical p value was 0.014. The present study suggested the genetic variants in the chromogranin A promoter may not involve in the onset of malignant hypertension, but the variants might play a role in the renal dysfunction in patients with IgAN-MHT.
authors.affiliation: Renal Division of Peking University First Hospital, Peking University Institute of Nephrology, Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, People's Republic of China.
authors.forename: L
authors.initials: L
authors.lastname: Yu
authors.forename: L
authors.initials: L
authors.lastname: Jiang
authors.forename: X J
authors.initials: XJ
authors.lastname: Zhou
authors.forename: L
authors.initials: L
authors.lastname: Zhu
authors.forename: H
authors.initials: H
authors.lastname: Zhang
mesh_terms: D000328:Adult; D053379:Chromogranin A / Q000235:genetics*; D005260:Female; D005922:Glomerulonephritis, IGA / Q000150:complications / Q000235:genetics*; D006801:Humans; D006974:Hypertension, Malignant / Q000150:complications* / Q000235:genetics*; D008297:Male; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic / Q000235:genetics*; D051437:Renal Insufficiency / Q000209:etiology* / Q000235:genetics*
chemical_list: C506150:CHGA protein, human; D053379:Chromogranin A