Key result
Mitochondrial haplogroup T cybrids demonstrated a higher survival rate when challenged with hydrogen peroxide compared to haplogroup H cybrids, indicating a higher capability to cope with oxidative stress.
Why the study?
Does mitochondrial haplogroup T alter mitochondrial function and susceptibility to oxidative stress compared to haplogroup H in HEK293 cybrid cells?
Does mitochondrial haplogroup T alter mitochondrial function and susceptibility to oxidative stress compared to haplogroup H in HEK293 cybrid cells?
Mitochondrial haplogroup T confers a higher capability to cope with oxidative stress in vitro compared to haplogroup H, demonstrating functional differences in mitochondrial genomic backgrounds that may relate to multifactorial disease risks.
Answers are grounded in this paper and cite their sources.
May support haplogroup T resilience to oxidative stress in vitro; leaves open relevance to human disease risk pending validation.
BACKGROUND: Epidemiological case-control studies have revealed associations between mitochondrial haplogroups and the onset and/or progression of various multifactorial diseases. For instance, mitochondrial haplogroup T was previously shown to be associated with vascular diseases, including coronary artery disease and diabetic retinopathy. In contrast, haplogroup H, the most frequent haplogroup in Europe, is often found to be more prevalent in healthy control subjects than in patient study groups. However, justifications for the assumption that haplogroups are functionally distinct are rare. Therefore, we attempted to compare differences in mitochondrial function between haplogroup H and T cybrids. METHODOLOGY/PRINCIPAL FINDINGS: Mitochondrial haplogroup H and T cybrids were generated by fusion of HEK293 cells devoid of mitochondrial DNA with isolated thrombocytes of individuals with the respective haplogroups. These cybrid cells were analyzed for oxidative phosphorylation (OXPHOS) enzyme activities, mitochondrial DNA (mtDNA) copy number, growth rate and susceptibility to reactive oxygen species (ROS). We observed that haplogroup T cybrids have higher survival rate when challenged with hydrogen peroxide, indicating a higher capability to cope with oxidative stress. CONCLUSIONS/SIGNIFICANCE: The results of this study show that functional differences exist between HEK293 cybrid cells which differ in mitochondrial genomic background.
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Mueller et al. (2012) studied Mitochondrial haplogroup differences (n=6). Mitochondrial haplogroup T vs. Mitochondrial haplogroup H was evaluated on Cell survival rate when challenged with hydrogen peroxide (oxidative stress). Mitochondrial haplogroup T cybrids demonstrated a higher survival rate when challenged with hydrogen peroxide compared to haplogroup H cybrids, indicating a higher capability to cope with oxidative stress.
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