Heart rate variability is associated with polymorphic variation in the choline transporter gene

Area of Science:

• Cardiovascular Physiology
• Neurogenetics
• Autonomic Nervous System Research

Background:

• Heart rate variability (HRV) reflects autonomic nervous system (ANS) balance.
• Parasympathetic and sympathetic regulation of heart rate are crucial for cardiovascular health.
• Genetic factors may contribute to individual differences in ANS function.

Purpose of the Study:

• To investigate the association between genetic variation in the choline transporter gene (CHT1) and heart rate variability (HRV).
• To determine if genetic polymorphisms in CHT1 explain interindividual differences in parasympathetic and sympathetic heart rate regulation.

Main Methods:

• Resting HRV was assessed using electrocardiogram recordings in 413 European ancestry individuals.
• Heart rate variability indices, including high-frequency (HF) and low-frequency (LF) power and the LF/HF ratio, were calculated.
• Genotyping was performed for a single nucleotide polymorphism (SNP) in the CHT1 gene.

Main Results:

• Individuals with a T allele in the CHT1 gene exhibited significantly higher HF power and lower LF power and LF/HF ratios compared to GG homozygotes.
• These findings suggest a link between CHT1 genetic variation and parasympathetic activity.
• Women showed lower LF power and LF/HF ratios than men, indicating sex-based differences in autonomic regulation.

Conclusions:

• Polymorphic variation in the CHT1 gene is significantly associated with interindividual variability in HRV.
• The choline transporter gene (CHT1) plays a role in modulating parasympathetic (cholinergic) activity.
• Genetic factors, specifically CHT1 gene variants, contribute to the regulation of heart rate variability.