Cited by 32Mitochondrial Function and PathologyAutophagy in Disease and TherapyForensic and Genetic Research

Mitochondrial DNA segregation in hematopoietic lineages does not depend on MHC presentation of mitochondrially encoded peptides

Battersby, Brendan J., Redpath, Margaret E., Shoubridge, Eric A.·2005·Human Molecular Genetics

Abstract

Mutations in mitochondrial DNA (mtDNA) are associated with a broad spectrum of clinical disorders. The segregation pattern of pathogenic mtDNAs is an important determinant of both the onset and the severity of the disease phenotype, but the mechanisms controlling mtDNA segregation remain poorly understood. To investigate this, we previously generated heteroplasmic mice containing two different mtDNA haplotypes and showed that BALB/c mtDNA was invariably selected over NZB mtDNA in blood and spleen. Here, we have characterized this process in hematopoietic tissues and tested whether it involves the presentation of mtDNA-encoded peptides by MHC class Ib molecules. Selection against NZB mtDNA was widespread across different hematopoietic cell lineages and proportional to heteroplasmy levels. Backcrossing heteroplasmic mice with CAST/Ei, a strain in which the MHC class Ib molecule H2-M3 is silent, completely abolished selection against NZB mtDNA in the spleen. To test whether this effect depended on an intact immune system, we generated heteroplasmic mice missing functional copies of Tap1, beta2m or Rag1 to impair presentation or recognition of mtDNA-encoded peptides. The kinetics of selection against NZB mtDNA were unaltered in these mice compared with their wild-type littermates. We conclude that mtDNA selection in hematopoietic tissues is not based on an immune mechanism, but likely involves metabolic signaling.

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Crossref · 10.1093/hmg/ddi293

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  • Directional selection for one mtDNA genotype in certain tissues, mediated by single tissue-specific factors, has been repeatedly observed.

    “However, the repeated observation of directional selection for one mtDNA genotype in certain tissues [170], mediated by single tissue-specific factors [171], suggests these mouse models will be particularly important in our quest to understanding the basis of tissue specificity and mtDNA somatic segregation.”

    From Mitochondrial DNA mutations and human disease (2010) · cites this paper as [171]

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Authors
Battersby, B. J., Redpath, M. E., & Shoubridge, E. A.
Affiliations
Montreal Neurological Institute and Hospital (CA)
Corresponding author
Battersby, Brendan J.
Venue
Human Molecular Genetics
Published
2005-07-27
Volume
14
Issue
17
Pages
2587-2594
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2104456826
Cited by
32
References
34
Citations by year
2024: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 2 · 2015: 4 · 2014: 2 · 2013: 1 · 2012: 4
FWCI
1.25
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
McGill University
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Forensic and Genetic Research
Keywords
mitochondrial DNA segregation, heteroplasmy, MHC class Ib, hematopoietic lineage, TAP1, beta2m, RAG1, metabolic signaling, mitochondrial disease
MeSH terms
Aging, Animals, DNA, Mitochondrial, Haplotypes, Hematopoietic Stem Cells, Major Histocompatibility Complex, Mice, Inbred BALB C, Mice, Inbred Strains, Mitochondria, Chromosome Segregation, Mice

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