Clade
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Description

Haplogroup K1a4 is one of the major subclades of K1a, itself the most common K subclade. K1a4 includes K1a4a1, which is one of the four major founding mtDNA haplogroups of the Ashkenazi Jewish population. K1a4a1 is carried by approximately 10–12% of Ashkenazi Jewish women and represents one of the most dramatic genetic founder effects ever documented in a modern human population. K1a4 is found broadly in the Near East and at lower frequencies across Europe.

Interesting Fact

K1a4a1, the most notable K1a4 subclade, shows a remarkable star-shaped phylogeny consistent with rapid exponential population growth from a very small founding group — estimated at fewer than 10 women — who lived approximately 1,000–2,000 years ago in the Near East before the Ashkenazi communities were established in medieval Europe. Together with K1a1b1a and K1a9, these K lineages account for nearly 30% of all Ashkenazi maternal DNA.

Distribution by Ethnicity

Ethnic distributionRegionFrequencySample
Ashkenazi JewsEurope / Near East
12%
n=500
Sephardic JewsNear East / Mediterranean
6%
n=300
Levantine ArabsNear East
4%
n=200
TurksAnatolia
3%
n=250
Europeans (average)Europe
1.5%
n=1000

Tags

AshkenaziJewishNear EastFounder effectLevantNeolithicmtDNA

References

  1. Behar et al. (2006) — The matrilineal ancestry of Ashkenazi Jewry: portrait of a recent founder event. American Journal of Human Genetics 78(3), 487–497.
  2. Costa et al. (2013) — A substantial prehistoric European ancestry amongst Ashkenazi maternal lineages. Nature Communications 4, 2543.