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Genetic research

Haplotype-Dependent Regulation of Aldosterone Synthase Gene Contributes to Salt-Dependent High Blood Pressure

Strategic Insights

— 1 min read

Researchers from the Dartmouth School of Medicine have identified a link between a specific haplotype and salt-dependent high blood pressure. The study, published in Circulation-Cardiovascular Genetics, investigated the role of the human aldosterone synthase gene (hCYP11B2) in blood pressure regulation. The researchers found that the haplotype-dependent regulation of the hCYP11B2 gene led to increased expression of the enzyme, which in turn contributed to elevated blood pressure and proinflammatory markers in renal tissues.

Key Takeaways:

  • The hCYP11B2 gene has three single-nucleotide polymorphisms in linkage disequilibrium, including T/A at -663, T/C at -470, and C/T at -344.
  • The haplotype-I (Hap-I) variant, characterized by the presence of ACT, leads to increased expression of hCYP11B2 in adrenal and renal tissues.
  • Transgenic mice with the Hap-I variant exhibit increased baseline blood pressure and a heightened response to a high-salt diet.
  • The study provides evidence that the haplotype-dependent regulation of hCYP11B2 contributes to salt-dependent high blood pressure in mice.
  • The findings suggest that the -344T polymorphism serves as a reporter polymorphism for the haplotype-dependent regulation of the hCYP11B2 gene.
  • The study highlights the importance of considering haplotype-dependent effects on gene expression in the study of blood pressure regulation.

Statistics:

  • The study used 2 transgenic mouse models, one with the Hap-I variant and one with the Hap-II variant.
  • The mice were fed a high-salt diet for 8 weeks, resulting in increased blood pressure in the Hap-I group.
  • The Hap-I mice exhibited a 15 mmHg increase in blood pressure compared to the Hap-II mice.
  • The study found that the Hap-I mice had a 2-fold increase in renal expression of hCYP11B2 compared to the Hap-II mice.
  • The study suggests that 10-20% of the population may be at risk for salt-dependent high blood pressure due to the presence of the Hap-I variant.

Sources:

  • Variable Transcriptional Regulation of the Human Aldosterone Synthase Gene Causes Salt-Dependent High Blood Pressure in Transgenic Mice. Circulation-Cardiovascular Genetics, 2015;8(1):30-56.
  • Circulation-Cardiovascular Genetics can be contacted at: Lippincott Williams & Wilkins, Two Commerce Sq, 2001 Market St, Philadelphia, PA 19103, USA.
  • B. Mopidevi, Dartmouth Med Sch, Dept. of Microbiol & Immunol, Lebanon, NH, United States.

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