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T cell differentiation drives the negative selection of pathogenic mitochondrial DNA variants

Lookup NU author(s): Imogen Franklin, Dr Paul Milne, Jordan Childs, Dr Roisin Boggan, Isabel Barrow, Dr Conor LawlessORCiD, Professor Grainne Gorman, Dr Yi NgORCiD, Professor Matthew CollinORCiD, Dr Oliver Russell, Dr Sarah PickettORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 2023 Franklin et al. Pathogenic mitochondrial DNA (mtDNA) single-nucleotide variants are a common cause of adult mitochondrial disease. Levels of some variants decrease with age in blood. Given differing division rates, longevity, and energetic requirements within haematopoietic lineages, we hypothesised that cell-type-specific metabolic requirements drive this decline. We coupled cell-sorting with mtDNA sequencing to investigate mtDNA variant levels within progenitor, myeloid, and lymphoid lineages from 26 individuals harbouring one of two pathogenic mtDNA variants (m.3243A>G and m.8344A>G). For both variants, cells of the T cell lineage show an enhanced decline. High-throughput single-cell analysis revealed that decline is driven by increasing proportions of cells that have cleared the variant, following a hierarchy that follows the current orthodoxy of T cell differentiation and maturation. Furthermore, patients with pathogenic mtDNA variants have a lower proportion of T cells than controls, indicating a key role for mitochondrial function in T cell homeostasis. This work identifies the ability of T cell subtypes to selectively purify their mitochondrial genomes, and identifies pathogenic mtDNA variants as a new means to track blood cell differentiation status.


Publication metadata

Author(s): Franklin IG, Milne P, Childs J, Boggan RM, Barrow I, Lawless C, Gorman GS, Ng YS, Collin M, Russell OM, Pickett SJ

Publication type: Article

Publication status: Published

Journal: Life Science Alliance

Year: 2023

Volume: 6

Issue: 11

Print publication date: 01/11/2023

Online publication date: 31/08/2023

Acceptance date: 09/08/2023

Date deposited: 12/09/2023

ISSN (electronic): 2575-1077

Publisher: Life Science Alliance LLC

URL: https://doi.org/10.26508/lsa.202302271

DOI: 10.26508/lsa.202302271

Data Access Statement: Underlying data and supporting analytic code for the manuscript can be accessed via https://github.com/sarahjpickett/mtDNA_variant_blood_cells.

PubMed id: 37652671


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Funding

Funder referenceFunder name
203105/Z/16/ZWellcome Trust
219562/Z/19Z
204709/Z/16/ZWellcome Trust
COAF

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