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Association between Mitochondrial DNA Sequence Variants and V˙O2 max Trainability.

Heather L Vellers1, Kirsten C Verhein2, Adam B Burkholder2

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Mitochondrial DNA (mtDNA) haplogroups differ between high and low aerobic exercise responders. Specific mtDNA variants may influence maximal oxygen uptake trainability, offering insights into exercise physiology.

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Area of Science:

  • Genetics
  • Exercise Physiology
  • Mitochondrial Biology

Background:

  • Mitochondrial DNA (mtDNA) plays a crucial role in cellular energy production.
  • Individual variability exists in response to aerobic exercise training, particularly in maximal oxygen uptake (VO2 max).
  • Understanding the genetic underpinnings of exercise response can inform personalized training strategies.

Purpose of the Study:

  • To investigate differences in mitochondrial DNA (mtDNA) haplogroup, sequence, and heteroplasmy between individuals with low (LR) and high (HR) maximal oxygen uptake response to aerobic exercise.
  • To identify specific mtDNA variations associated with exercise trainability.

Main Methods:

  • DNA was extracted from whole blood of 30 participants (15 HR, 15 LR) from the HERITAGE Family Study.
  • Mitochondrial DNA (mtDNA) was amplified using long-range polymerase chain reaction.
  • Nextera libraries were used for sequencing on a MiSeq instrument to analyze mtDNA variations.

Main Results:

  • Significant differences in mtDNA haplogroup subtypes were observed between HR and LR individuals.
  • LR subjects exhibited more variants in 13 specific mtDNA sites, including hypervariable regions (HV2, HV3, HV1) and protein-coding genes (mtND1, mtND3, mtND4, mtND5, mtCYTB).
  • No significant differences were found in the average total number or frequency of heteroplasmies between the groups.

Conclusions:

  • Specific sites within the mitochondrial genome are associated with maximal oxygen uptake trainability.
  • These findings contribute to understanding the genetic factors influencing an individual's response to aerobic exercise.
  • The identified mtDNA variants may serve as potential biomarkers for predicting exercise response.