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Epigenome-wide association study of mitochondrial genome copy number.

TitleEpigenome-wide association study of mitochondrial genome copy number.
Publication TypeJournal Article
Year of Publication2021
AuthorsWang P, Castellani CA, Yao J, Huan T, Bielak LF, Zhao W, Haessler J, Roby J, Sun X, Guo X, Longchamps RJ, Manson JAE, Grove ML, Bressler J, Taylor KD, Lappalainen T, Kasela S, Van Den Berg DJ, Hou L, Reiner A, Liu Y, Boerwinkle E, Smith JA, Peyser PA, Fornage M, Rich SS, Rotter JI, Kooperberg C, Arking DE, Levy D, Liu C
Corporate AuthorsNHLBI Trans-Omics for Precision Medicine(TOPMed) Consortium
JournalHum Mol Genet
Date Published2021 Aug 20

We conducted cohort- and race-specific epigenome-wide association analyses of mtDNA copy number (mtDNA CN) measured in whole blood from participants of African and European origins in five cohorts (n = 6182, mean age 57-67 years, 65% women). In the meta-analysis of all the participants, we discovered 21 mtDNA CN-associated CpG sites (p < 1 x 10-7), with a 0.7 to 3.0 standard deviation increase (3 CpGs) or decrease (18 CpGs) in mtDNA CN corresponding to a 1% increase in DNA methylation. Several significant CpGs have been reported to be associated with at least two risk factors (e.g. chronological age or smoking) for cardiovascular disease (CVD). Five genes (PRDM16, NR1H3, XRCC3, POLK, and PDSS2), which harbor nine significant CpGs, are known to be involved in mitochondrial biosynthesis and functions. For example, NR1H3 encodes a transcription factor that is differentially expressed during an adipose tissue transition. The methylation level of cg09548275 in NR1H3 was negatively associated with mtDNA CN (effect size = -1.71, p = 4 x 10-8) and positively associated with the NR1H3 expression level (effect size = 0.43, p = 0.0003), which indicates that the methylation level in NR1H3 may underlie the relationship between mtDNA CN, the NR1H3 transcription factor, and energy expenditure. In summary, the study results suggest that mtDNA CN variation in whole blood is associated with DNA methylation levels in genes that are involved in a wide range of mitochondrial activities. These findings will help reveal molecular mechanisms between mtDNA CN and CVD.

Alternate JournalHum Mol Genet
PubMed ID34415308
Grant ListR01 HL133221 / HL / NHLBI NIH HHS / United States