# Mitochondrial haplogroups

Mitochondrial haplogroups are clusters of maternally inherited mitochondrial DNA (mtDNA) haplotypes defined by shared polymorphisms, reflecting ancient migration patterns and geographic lineages. Because mtDNA encodes 13 essential respiratory-chain subunits and 22 tRNAs, haplogroup-defining variants can subtly alter oxidative phosphorylation efficiency, reactive oxygen species production, and mitochondrial morphology. Several studies have reported associations between specific haplogroups and longevity, most notably sub-haplogroups D4a and D5 among Japanese centenarians (Tanaka et al.), and haplogroup J in some European centenarian cohorts; however, replication across populations is inconsistent, sample sizes in the original studies were modest, and population stratification is a persistent confound. Mitochondrial haplogroups therefore represent plausible but not firmly established modulators of aging trajectory.

## Sources

- Wallace DC. (2005). A mitochondrial paradigm of metabolic and degenerative diseases, aging, and cancer: a dawn for evolutionary medicine. Annual Review of Genetics. https://doi.org/10.1146/annurev.genet.39.110304.095751
- Nishigaki Y, Fuku N, Tanaka M. (2010). Mitochondrial haplogroups associated with lifestyle-related diseases and longevity in the Japanese population. Geriatrics & Gerontology International. https://doi.org/10.1111/j.1447-0594.2010.00599.x

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