Author
Listed:
- Changwei Li
- Xueli Yang
- Jiang He
- James E Hixson
- Dongfeng Gu
- Dabeeru C Rao
- Lawrence C Shimmin
- Jianfeng Huang
- Charles C Gu
- Jichun Chen
- Jianxin Li
- Tanika N Kelly
Abstract
Background: Serum and glucocorticoid regulated kinase (SGK) plays a critical role in the regulation of renal sodium transport. We examined the association between SGK genes and salt sensitivity of blood pressure (BP) using single-marker and gene-based association analysis. Methods: A 7-day low-sodium (51.3 mmol sodium/day) followed by a 7-day high-sodium intervention (307.8 mmol sodium/day) was conducted among 1,906 Chinese participants. BP measurements were obtained at baseline and each intervention using a random-zero sphygmomanometer. Additive associations between each SNP and salt-sensitivity phenotypes were assessed using a mixed linear regression model to account for family dependencies. Gene-based analyses were conducted using the truncated p-value method. The Bonferroni-method was used to adjust for multiple testing in all analyses. Results: In single-marker association analyses, SGK1 marker rs2758151 was significantly associated with diastolic BP (DBP) response to high-sodium intervention (P = 0.0010). DBP responses (95% confidence interval) to high-sodium intervention for genotypes C/C, C/T, and T/T were 2.04 (1.57 to 2.52), 1.79 (1.42 to 2.16), and 0.85 (0.30 to 1.41) mmHg, respectively. Similar trends were observed for SBP and MAP responses although not significant (P = 0.15 and 0.0026, respectively). In addition, gene-based analyses demonstrated significant associations between SGK1 and SBP, DBP and MAP responses to high sodium intervention (P = 0.0002, 0.0076, and 0.00001, respectively). Neither SGK2 nor SGK3 were associated with the salt-sensitivity phenotypes in single-maker or gene-based analyses. Conclusions: The current study identified association of the SGK1 gene and BP salt-sensitivity in the Han Chinese population. Further studies are warranted to identify causal SGK1 gene variants.
Suggested Citation
Changwei Li & Xueli Yang & Jiang He & James E Hixson & Dongfeng Gu & Dabeeru C Rao & Lawrence C Shimmin & Jianfeng Huang & Charles C Gu & Jichun Chen & Jianxin Li & Tanika N Kelly, 2014.
"A Gene-Based Analysis of Variants in the Serum/Glucocorticoid Regulated Kinase (SGK) Genes with Blood Pressure Responses to Sodium Intake: The GenSalt Study,"
PLOS ONE, Public Library of Science, vol. 9(5), pages 1-7, May.
Handle:
RePEc:plo:pone00:0098432
DOI: 10.1371/journal.pone.0098432
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