Haplogroup K2a (Y-DNA)
| Haplogroup K2a | |
|---|---|
| Possible time of origin | 47,000 years BP (Estimated based on the immediate ancestor K2 originating 47,000–55,000 BP, and the secondary descendant NO approximately 38,000 to 47,000 BP.) |
| Possible place of origin | Central Asia or Southeast Asia |
| Ancestor | K2 (M526) |
| Descendants | Sole primary subclade: K-M2313 (M2313); Confirmed secondary subclades:
|
| Defining mutations | M2308, Z4842 |
Haplogroup K2a (M2308, Z4842) is a human Y-chromosome DNA haplogroup. K2a is a primary subclade of haplogroup K2 (M526), which in turn is a primary descendant of haplogroup K (M9). Its sole primary descendant is haplogroup K-M2313 (M2313, Z4858 S11799).
As of 2025, K-M2313 is known to have at least four primary subclades: Haplogroup NO1 (a.k.a. NO-M214), which has numerous members and the extremely rare subclades: K-Y28394, sometimes known as NO2, K-FTC181, and K-MF106925.
Basal, undivergent K2a* (K-M2308*) has only been found in the remains of two Upper Paleolithic individuals, known as "Ust'-Ishim man and "Oase-1", who lived in Siberia and the Banat region of south-central Europe, respectively, about 37,000 to 45,000 years ago.
The current existing branches of K-M2313 are all downstream of K-F549. It diversified into subclades like NO-M214 include a majority of living males in East Asia, Southeast Asia, and Northern Eurasia. Rare subclades that do not belong to NO-M214 such as K-Y28299 has been found in individuals from India and Pakistan, K-F14963 has been found in individuals from the Toba Batak in Sumatra and the Mandar of Sulawesi. K-FTC181 and K-MF10925 has been found in individuals from Thailand and Vietnam respectively. These branches share a common ancestor with NO-M214 at K-F549.