| K1a1b1a | |
| Origin-Date: | 4,800 ± 3,600 Years Ago |
| Origin-Place: | Europe |
| Ancestor: | K1a1b1 |
| Mutations: | A10978G T12954C C16234T[1] |
In human mitochondrial genetics, Haplogroup K1a1b1a is a human mitochondrial DNA (mtDNA) haplogroup.
The K1a1b1a mitochondrial DNA haplogroup subclade is found in Ashkenazi Jews and other populations. It is a subclade under haplogroup U'K.
According to National Geographic's Genographic Project, K1a1b1a has an unknown origin. The site stated, "Though the origin of this lineage is not clear, it is a founding population among some Jewish Diaspora groups. Among Ashkenazi Jews, it is about 19 percent of maternal lineages." Estimates of the age of K1a1b1a vary depending on the mutation rates used. The age of K1a1b1a has been estimated at 4,800 ± 3,600 Years Ago, according to the Genographic Project.
The K1a1b1a subclade is under the U'K haplogroup and descends from K1a1b1, which is thought to be an 11,500-year-old European subclade of mostly non Jewish origins. Haplogroup K falls under the old U8 grouping. Some of the Basque people of Spain and France fall under the U8a subclade within U8. K1a1b1a is a U8b subclade within U8, with several downstream variations.
Ötzi, a mummy who was found September 1991 in the Ötztal Alps, is subclade K1ö. Ötzi has mtDNA marker 10978 in common with the Ashkenazi population and others who fall under the K1a1b1a subclade.
By the time of Build 17, released on February 18, 2016, van Oven's phylogenetic tree, called the PhyloTree, updated its definition of K1a1b1a. Now, it requires the presence of the markers 10978 and 12954 in the coding region, and 16234 in the first hypervariable region (HVR1). The mutations involved are written out as A10978G (meaning A transitioned to G), T12954C (meaning T transitioned to C), and C16234T (meaning C transitioned to T). The definition of K1a1b1a no longer requires the mutation (C114T) on the highly polymorphic marker 114 in the second hypervariable region (HVR2). In Build 3, K1a1b1a had been defined by (114), 10978, and 16234 but did not need 12954. In Build 17, (C114T) appears as part of the definition of K1a1 instead. A minority of K1a1b1a carriers, such as JQ702155 and JQ703012, are missing (C114T).
10% of Europeans fall under the K haplogroup. It is hypothesized that the subclade represents one of four major founding maternal lineages ("founding mothers") of Ashkenazi Jews which together account for 45% of all Ashkenazi mtDNA haplotypes. Approximately 19% of Ashkenazi Jews with ancestry from Poland are in mtDNA haplogroup K1a1b1a.[2] However, K1a1b1a has also been found in individuals of no known Jewish ancestry, and the explanation will require further research. The Genographic Project along with other research groups are looking into this phenomenon. The haplogroup is distributed in Europe and the Middle East.[3] Estimates suggest approximately 1,600,000 Jews worldwide would be K1a1b1a.
The field of genetic genealogy and DNA sequencing has permitted ordinary people to make use of DNA testing to establish some evidence for their ancestral origins. Thousands of Family Tree DNA customers have submitted their mtDNA sequences for use in scientific studies,[4] including those led by Behar and Brook. Additional samples were provided by the National Laboratory for the Genetics of Israeli Populations. Accordingly, based on the research of Behar, some connection has been established between the K1a1b1a subclade and Jewish ancestry. Aside from Ashkenazi Jews, K1a1b1a is also found in multiple communities of Sephardic Jews from Italy, Turkey, and southeastern Europe[5] along with Baghdadi Jews from India and Paradesi Jews from India.[6] It is also present among the Xueta people of Spain.[7] The notion of Romani origins for K1a1b1a is impossible, given the much greater genetic diversity of K1a1b1a in Jews and the fact that this haplogroup was already widespread in Jewish populations by the 14th century. The presence of K1a1b1a in Romani people in Poland[8] is the result of introgression into a Romani population.
A growing number of GenBank samples support the observations of mutations and population distributions described above.
| GenBank ID | Origin | Ethnicity | Author(s) | |
|---|---|---|---|---|
| DQ301789 | U/N | Ashkenazi[9] | Behar, D. et al. | |
| DQ301795 | U/N | Ashkenazi | Behar, D. et al. | |
| DQ301802 | U/N | Ashkenazi | Behar, D. et al. | |
| DQ301803 | U/N | Ashkenazi | Behar, D. et al. | |
| DQ301805 | U/N | Ashkenazi | Behar, D. et al. | |
| DQ301813 | U/N | Ashkenazi | Behar, D. et al. | |
| EU052292 | U/N | U/N | Greenspan,B. (FTDNA) | |
| EU170362 | U/N | U/N | Greenspan,B. (FTDNA) | |
| EU259709 | U/N | U/N | Greenspan,B. (FTDNA) | |
| EU327782 | Zhitomir, Ukraine | Ukrainian | Greenspan,B. (FTDNA) | |
| EU523126 | U/N | U/N | Greenspan,B. (FTDNA) | |
| EU862197 | USA | European | Greenspan,B. (FTDNA) | |
| EU926147 | USA | Jewish | Greenspan,B. (FTDNA) | |
| FJ228404 | Fălticeni, Romania | Ashkenazi | Greenspan,B. (FTDNA) | |
| FJ938288 | Ashkenazi | Greenspan,B. (FTDNA) | ||
| GU320192 | USA | Romanian | Greenspan,B. (FTDNA) | |
| GU571200 | Frankfurt am Main, Germany | Ashkenazi | Greenspan,B. (FTDNA) | |
| GU585492 | U/N | U/N | Greenspan,B. (FTDNA) | |
| GU722599 | Bonn, Germany | Ashkenazi | Greenspan,B. (FTDNA) | |
| GU723693 | USA | Ashkenazi | Greenspan,B. (FTDNA) | |
| HM101136 | USA | U/N | Greenspan,B. (FTDNA) | |
| HQ667591 | Budapest, Hungary | Ashkenazi | Greenspan,B. (FTDNA) | |
| HQ901176 | USA | Jewish | Greenspan,B. (FTDNA) | |
| JN990448 | USA | Ashkenazi | Greenspan,B. (FTDNA) | |
| JQ702155 | Hungary | U/N | Behar, D. et al. | |
| JQ702245 | U/N | U/N | Behar, D. et al. | |
| JQ702671 | Ukraine | Ashkenazi | Behar, D. et al. | |
| JQ702676 | Uzbekistan | Ashkenazi | Behar, D. et al. | |
| JQ702755 | Poland | U/N | Behar, D. et al. | |
| JQ702780 | Belarus | Ashkenazi | Behar, D. et al. | |
| JQ702859 | Lithuania | U/N | Behar, D. et al. | |
| JQ702945 | Russia | Ashkenazi | Behar, D. et al. | |
| JQ703012 | Russia | Ashkenazi | Behar, D. et al. | |
| JQ703069 | U/N | Ashkenazi | Behar, D. et al. | |
| JQ703165 | U/N | U/N | Behar, D. et al. | |
| JQ703308 | U/N | U/N | Behar, D. et al. | |
| JQ703485 | U/N | U/N | Behar, D. et al. | |
| JQ703662 | Ukraine | U/N | Behar, D. et al. | |
| JQ703855 | Germany | U/N | Behar, D. et al. | |
| JQ704216 | U/N | U/N | Behar, D. et al. | |
| JQ704654 | Germany | U/N | Behar, D. et al. | |
| JQ704812 | U/N | U/N | Behar, D. et al. | |
| JQ705016 | Poland | Ashkenazi | Behar, D. et al. | |
| JQ705204 | Germany | U/N | Behar, D. et al. | |
| JQ705568 | Ukraine | Ashkenazi | Behar, D. et al. | |
| JQ705628 | Ukraine | Ashkenazi | Behar, D. et al. | |
| JQ705745 | Lithuania | Ashkenazi | Behar, D. et al. | |
| JQ705951 | U/N | Ashkenazi | Behar, D. et al. | |
| JQ705979 | U/N | U/N | Behar, D. et al. | |
| JQ706006 | U/N | U/N | Behar, D. et al. | |
| JX153534 | Denmark | U/N | Raule,N. et al.[10] | |
| KC878724 | Campania, Italy | U/N | Costa, M. et al. | |
| KC914580 | USA | Ashkenazi | Greenspan,B. (FTDNA) | |
| KF435080 | USA | Jewish | Greenspan,B. (FTDNA) | |
| KM047228 | Poland | U/N | Skonieczna,K. et al.[11] | |
| KR491936 | USA | Ashkenazi | Greenspan,B. (FTDNA) | |
| KT946594 | Great Britain, UK | U/N | Lee,W.T.Y. et al.[12] | |
| KX350098 | Spain | U/N | Iglesias,E. | |
| KY782247 | Poland | U/N | Malyarchuk,B. et al.[13] | |
| MH120573 | Poland | U/N | Piotrowska-Nowak,A. et al.[14] | |
| MH120671 | Poland | U/N | Piotrowska-Nowak,A. et al. | |
| MN176259 | Poland | U/N | Piotrowska-Nowak,A. | |
| MZ386799 | USA | U/N | Taylor,C.R. et al.[15] | |
| MZ387869 | USA | U/N | Taylor,C.R. et al. | |
| PP153372 | Mumbai, India | Brook,K.A. et al. |
It may be recognized in hypervariable-only samples by the following essential mutations:
| ID | Origin | Ethnicity | Period | Author(s) | |
|---|---|---|---|---|---|
| I13861 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al.[16] | |
| I13862 | Erfurt, Germany | West Knaanic Jewish (Erfurt-EU) | 14th century | Waldman,S. et al. | |
| I13866 | Erfurt, Germany | West Knaanic Jewish (Erfurt-EU) | 14th century | Waldman,S. et al. | |
| I13867 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al. | |
| I13870 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al. | |
| I14736 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al. | |
| I14741 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al. | |
| I14846 | Erfurt, Germany | Jewish | 14th century | Waldman,S. et al. | |
| I14851 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al. | |
| I14899 | Erfurt, Germany | Jewish | 14th century | Waldman,S. et al. | |
| I14903 | Erfurt, Germany | Ashkenazi Jewish (Erfurt-ME) | 14th century | Waldman,S. et al. |
This phylogenetic tree of haplogroup K subclades is based on the paper by Mannis van Oven and Manfred Kayser Updated comprehensive phylogenetic tree of global human mitochondrial DNA variation and subsequent published research.
