Interference of nuclear mitochondrial DNA segments in mitochondrial DNA testing resembles biparental transmission of mitochondrial DNA in humans.

Journal Article (Journal Article)

PURPOSE: Reports have questioned the dogma of exclusive maternal transmission of human mitochondrial DNA (mtDNA), including the recent report of an admixture of two mtDNA haplogroups in individuals from three multigeneration families. This was interpreted as being consistent with biparental transmission of mtDNA in an autosomal dominant-like mode. The authenticity and frequency of these findings are debated. METHODS: We retrospectively analyzed individuals with two mtDNA haplogroups from 2017 to 2019 and selected four families for further study. RESULTS: We identified this phenomenon in 104/27,388 (approximately 1/263) unrelated individuals. Further study revealed (1) a male with two mitochondrial haplogroups transmits only one haplogroup to some of his offspring, consistent with nuclear transmission; (2) the heteroplasmy level of paternally transmitted variants is highest in blood, lower in buccal, and absent in muscle or urine of the same individual, indicating it is inversely correlated with mtDNA content; and (3) paternally transmitted apparent large-scale mtDNA deletions/duplications are not associated with a disease phenotype. CONCLUSION: These findings strongly suggest that the observed mitochondrial haplogroup of paternal origin resulted from coamplification of rare, concatenated nuclear mtDNA segments with genuine mtDNA during testing. Evaluation of additional specimen types can help clarify the clinical significance of the observed results.

Full Text

Duke Authors

Cited Authors

  • Bai, R; Cui, H; Devaney, JM; Allis, KM; Balog, AM; Liu, X; Schnur, RE; Shapiro, FL; Brautbar, A; Estrada-Veras, JI; Hochstetler, L; McConkie-Rosell, A; McDonald, MT; Solomon, BD; Hofherr, S; Richard, G; Suchy, SF

Published Date

  • August 2021

Published In

Volume / Issue

  • 23 / 8

Start / End Page

  • 1514 - 1521

PubMed ID

  • 33846581

Electronic International Standard Serial Number (EISSN)

  • 1530-0366

Digital Object Identifier (DOI)

  • 10.1038/s41436-021-01166-1

Language

  • eng

Conference Location

  • United States