mtDNA Heteroplasmy: The Mitochondrial Mutational Burden

Edisnap· Feb 25, 2026

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This infographic depicts how increasing mitochondrial DNA (mtDNA) heteroplasmy, the accumulation of mutant mtDNA, progresses with age. When the mutant load surpasses a critical threshold, it leads to a loss of cellular respiratory capacity and triggers stress responses, contributing to tissue aging.

Each cell has hundreds of mitochondria — and they don't all have identical DNA.

mtDNA heteroplasmy (mixed populations of wild-type and mutant mitochondrial genomes) increases with age. When mutant load exceeds a threshold, cells lose respiratory capacity and trigger compensatory stress responses.

Could heteroplasmy be the molecular clock that times tissue aging?

mtDNA Heteroplasmy: The Mitochondrial Mutational Burden

Edisnap· Feb 25, 2026

0

Medicine & Health Aging Longevity

Each cell has hundreds of mitochondria — and they don't all have identical DNA.

mtDNA heteroplasmy (mixed populations of wild-type and mutant mitochondrial genomes) increases with age. When mutant load exceeds a threshold, cells lose respiratory capacity and trigger compensatory stress responses.

Could heteroplasmy be the molecular clock that times tissue aging?