Germline selection shapes human mitochondrial DNA diversity.

TitleGermline selection shapes human mitochondrial DNA diversity.
Publication TypeJournal Article
Year of Publication2019
AuthorsWei, W, Tuna, S, Keogh, MJ, Smith, KR, Aitman, TJ, Beales, PL, Bennett, DL, Gale, DP, Bitner-Glindzicz, MAK, Black, GC, Brennan, P, Elliott, P, Flinter, FA, R Floto, A, Houlden, H, Irving, M, Koziell, A, Maher, ER, Markus, HS, Morrell, NW, Newman, WG, Roberts, I, Sayer, JA, Smith, KGC, Taylor, JC, Watkins, H, Webster, AR, Wilkie, AOM, Williamson, C, Ashford, S, Penkett, CJ, Stirrups, KE, Rendon, A, Ouwehand, WH, Bradley, JR, F Raymond, L, Caulfield, M, Turro, E, Chinnery, PF
Corporate Authors,
JournalScience
Volume364
Issue6442
Date Published2019 05 24
ISSN1095-9203
Abstract

Approximately 2.4% of the human mitochondrial DNA (mtDNA) genome exhibits common homoplasmic genetic variation. We analyzed 12,975 whole-genome sequences to show that 45.1% of individuals from 1526 mother-offspring pairs harbor a mixed population of mtDNA (heteroplasmy), but the propensity for maternal transmission differs across the mitochondrial genome. Over one generation, we observed selection both for and against variants in specific genomic regions; known variants were more likely to be transmitted than previously unknown variants. However, new heteroplasmies were more likely to match the nuclear genetic ancestry as opposed to the ancestry of the mitochondrial genome on which the mutations occurred, validating our findings in 40,325 individuals. Thus, human mtDNA at the population level is shaped by selective forces within the female germ line under nuclear genetic control, which ensures consistency between the two independent genetic lineages.

DOI10.1126/science.aau6520
Alternate JournalScience
Citation Key10.1126/science.aau6520
PubMed ID31123110
Grant ListMR/J011711/1 / / Medical Research Council / United Kingdom
/ / Medical Research Council / United Kingdom
/ / Wellcome Trust / United Kingdom