Mitochondrial tRNA^Thr 15909A>G mutation associated with hypertension in a Chinese Han pedigree

Area of Science:

• Genetics
• Molecular Biology
• Cardiovascular Disease

Background:

• Mitochondrial DNA (mtDNA) mutations are implicated in the pathogenesis of hypertension.
• Understanding the genetic underpinnings of inherited hypertension is crucial for developing targeted therapies.

Purpose of the Study:

• To investigate the clinical, genetic, and molecular basis of maternally inherited hypertension in a Chinese Han family.
• To identify and characterize novel mtDNA mutations associated with hypertension.

Main Methods:

• Clinical evaluation, genetic analysis, and mutational profiling of a multi-generational Chinese Han family.
• Molecular characterization and biochemical assays to assess the impact of identified mtDNA variants on mitochondrial function.

Main Results:

• A specific variant, m.15909A>G, in the mitochondrial tRNA^Thr gene was identified in affected individuals.
• This mutation disrupts a conserved base pairing in the D-stem of tRNA^Thr, impairing its structure and function.
• The mutation led to decreased mitochondrial protein synthesis, reduced Complex activity, diminished ATP production, and increased reactive oxygen species (ROS) generation.

Conclusions:

• The m.15909A>G mtDNA mutation is a potential inherited factor contributing to hypertension in this Chinese Han pedigree.
• mtDNA mutations affecting mitochondrial function represent a significant, yet often overlooked, genetic basis for hypertension.