# Haplogroup H (mtDNA)
Haplogroup H is a mitochondrial DNA (mtDNA) haplogroup, a maternal lineage defined by shared mutations in mitochondrial genomes, and it is the most common mtDNA haplogroup in Europe, accounting for over 40% of mtDNA variation across much of Western Eurasia, with frequencies declining to roughly 10–30% in the [Near East](https://www.edgepedia.org/near-east) and the Caucasus.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) It is a direct subclade of haplogroup HV, which itself sits within haplogroup R0.[2](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0144391)
| Key fact | Detail |
|---|---|
| Frequency today | Over 40% of mtDNA variation in much of Western Eurasia; generally about 50% in European populations, reaching about 60% in the Basque country, and 25–30% in the Near East and Caucasus[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) • [3](https://www.sciencedirect.com/science/article/pii/S0002929707604091) |
| Phylogenetic position | A direct subclade of haplogroup HV within R0[2](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0144391) |
| Subclades | At least 15 subhaplogroups (H1–H15) identifiable by characteristic mutations, from complete sequencing of 62 H mtDNAs[4](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/) |
| Pre-Neolithic status | Virtually absent in Mesolithic hunter-gatherers; about 19% among Early Neolithic farmers (~5450 BC)[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) |
| Rise to dominance | Current diversity and distribution largely established by the Mid-Neolithic (~4000 BC), with substantial later contributions from pan-European cultures such as the Bell Beakers expanding out of Iberia (~2800 BC)[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) |
| Ancient DNA evidence | 39 complete hg H mitochondrial genomes sequenced from ancient remains spanning the Early Neolithic to the Bronze Age in Central Europe[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) |
| Mutation rate | Dated hg H genomes indicate a mitochondrial mutation rate 45% higher than then-current estimates[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) |
## Frequency and distribution
Haplogroup H combines an extremely wide geographic distribution with a very high frequency across most of its range, a combination unusual among European mtDNA haplogroups.[4](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/) European populations generally show overall H frequencies of about 50%, with a maximum of about 60% in the Basque country, while the Near East and the Caucasus sit at roughly 25–30%.[3](https://www.sciencedirect.com/science/article/pii/S0002929707604091) National surveys fall within this range: haplogroup H was the most frequent haplogroup in the Polish population at 43.42%, with the subhaplogroup H1 alone at 15.42%.[5](https://www.nature.com/articles/s41431-019-0381-x)
**Subclade geography.** Complete sequencing of 62 mitochondrial DNAs belonging or closely related to haplogroup H showed that it subdivides into numerous subhaplogroups, at least 15 of which (H1–H15) are identifiable by characteristic mutations.[4](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/) The two best-studied subhaplogroups, H1 and H3, display frequency peaks centered in Iberia and surrounding areas, with distributions declining toward the northeast and southeast, a pattern very similar to that reported for haplogroup V.[4](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/) This geography underlies the proposal that H1 and H3 spread in a post-glacial recolonization of central and northern Europe from the Franco-Cantabrian refuge.[6](https://www.nature.com/articles/hdy201047)
## Origins: Paleolithic, glacial refuge, and Neolithic models
Earlier phylogeographic work, based on control-region sequencing, proposed that haplogroup H originated in the Middle East around 30–25 thousand years ago, expanded into Europe with a second [Paleolithic](https://www.edgepedia.org/paleolithic) wave possibly contemporary with the [Gravettian](https://www.edgepedia.org/gravettian) (25–20 kya), and was strongly involved in late-glacial expansions from ice-age refugia after the [Last Glacial Maximum](https://www.edgepedia.org/last-glacial-maximum).[4](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/) Studies of subclade coalescence ages supported the view that H was the major mtDNA haplogroup participating in the recolonization of Europe after the Last Glacial Maximum, with most subclusters showing expansion beginning in the Late Upper Paleolithic.[7](https://academic.oup.com/mbe/article/21/11/2012/1147764) The Franco-Cantabrian glacial refuge has been identified as a major source for the European gene pool on this basis.[4](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/)
**The Neolithic question.** Ancient DNA changed the picture. Early farmer skeletons across Europe carry haplogroup H at 25–37% of retrieved mtDNAs, while haplogroup U, considered typical of hunter-gatherers, appears in only 13 of 105 (about 12%) early farming individuals; pre-[Neolithic](https://www.edgepedia.org/neolithic) hunter-gatherers show a quite distinct haplogroup profile.[8](https://pmc.ncbi.nlm.nih.gov/articles/PMC3302788/) These patterns support a demic diffusion model in which migrating early farmers from the Near East were largely responsible for the Neolithic transition in Europe.[8](https://pmc.ncbi.nlm.nih.gov/articles/PMC3302788/)
## Ancient genomes and the rise of H
The clearest temporal picture comes from sequencing 39 complete haplogroup H mitochondrial genomes from ancient human remains in [Central Europe](https://www.edgepedia.org/central-europe), compared against cultural change between the Early Neolithic (~5450 BC) and the [Bronze Age](https://www.edgepedia.org/bronze-age) (~2200 BC).[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) The results show that H was virtually absent in [Mesolithic](https://www.edgepedia.org/mesolithic) hunter-gatherers and less common (~19%) among Early Neolithic farmers than today, and that the current diversity and distribution of the haplogroup were largely established by the Mid-Neolithic (~4000 BC), with substantial genetic contributions from later pan-European cultures such as the Bell Beakers expanding out of Iberia in the Late Neolithic (~2800 BC).[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) The authors conclude that these Neolithic and post-Neolithic processes, together with generally higher population growth in southern and western Europe in post-Neolithic times, were the major factor in H becoming the predominant European mtDNA haplogroup.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) Ancient Croatian data likewise show an expansion of mtDNA haplogroup H over time from the Neolithic onward.[9](https://www.nature.com/articles/s41598-025-31756-x_reference.pdf)
This genetic changeover between Early and Mid/Late Neolithic cultures is comparable in scale to the earlier transition between indigenous European hunter-gatherers and incoming early farmers from the Near East from about 7500 BC in Central Europe.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/)
## Mutation rate and methodological insight
Because the 39 dated ancient genomes provide precise temporal calibration points, a Bayesian skyride analysis with 200 random present-day mt genome sequences was used to reconstruct the lineage history of haplogroup H through time, with the caveat of assuming a continuous and panmictic population.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) The dated genomes reveal a mitochondrial mutation rate 45% higher than the estimates then in use, a finding that affects molecular dating of maternal lineages generally.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/) The same study notes that traditional approaches, which sequenced only 300–400 base pairs of the mitochondrial control region, could not resolve the phylogeny or phylogeographic distribution of H subhaplogroups, whereas complete mitogenome typing across many individuals and cultural layers provides highly resolved temporal views.[1](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/)
## References
1. [Brotherton et al. Neolithic mitochondrial haplogroup H genomes and the genetic origins of Europeans, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC3978205/)
2. [De Fanti et al. Fine Dissection of Human Mitochondrial DNA Haplogroup HV Lineages Reveals Paleolithic Signatures from European Glacial Refugia, PLOS One](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0144391)
3. [In Search of Geographical Patterns in European Mitochondrial DNA, American Journal of Human Genetics](https://www.sciencedirect.com/science/article/pii/S0002929707604091)
4. [Achilli et al. The Molecular Dissection of mtDNA Haplogroup H Confirms That the Franco-Cantabrian Glacial Refuge Was a Major Source for the European Gene Pool, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC1182122/)
5. [Mitochondrial DNA variability of the Polish population, European Journal of Human Genetics](https://www.nature.com/articles/s41431-019-0381-x)
6. [Using mitochondrial DNA to test the hypothesis of a European post-glacial human recolonization from the Franco-Cantabrian refuge, Heredity](https://www.nature.com/articles/hdy201047)
7. [Disuniting Uniformity: A Pied Cladistic Canvas of mtDNA Haplogroup H in Eurasia, Molecular Biology and Evolution](https://academic.oup.com/mbe/article/21/11/2012/1147764)
8. [Complete Mitochondrial Genomes Reveal Neolithic Expansion into Europe, PMC](https://pmc.ncbi.nlm.nih.gov/articles/PMC3302788/)
9. [Ancient DNA study reference PDF, Scientific Reports](https://www.nature.com/articles/s41598-025-31756-x_reference.pdf)
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*Topic: Encyclopedia › Life and health › Biological foundations › Genetics and genomic reference › Human variation, haplogroups, and genetic genealogy*
*Initially written Sep 17, 2026 · Reviewed: Oct 21, 2026 · Edited: Oct 15, 2026; Oct 21, 2026 · Last review: Oct 21, 2026*
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