Haplogroup I-M253
Haplogroup I-M253, also known as I1, is a Y chromosome haplogroup. The genetic markers confirmed as identifying I-M253 are the SNPs M253,M307.2/P203.2, M450/S109, P30, P40, L64, L75, L80, L81, L118, L121/S62, L123, L124/S64, L125/S65, L157.1, L186, and L187. It is a primary branch of Haplogroup I-M170 (I*).
| Haplogroup I1 (M253) | |
|---|---|
| Possible time of origin | 3,170–4,600–5,070 BP (today's diversification) (previously 11,000 BP to 33,000 BP) 27,500 (diversification with I2-FGC77992) |
| Possible place of origin | Northern Europe |
| Ancestor | I* (M170) |
| Descendants | I1a (DF29/S438); I1b (S249/Z131); I1c (Y18119/Z17925) |
| Defining mutations | M253, M307.2/P203.2, M450/S109, P30, P40, L64, L75, L80, L81, L118, L121/S62, L123, L124/S64, L125/S65, L157.1, L186, L187 |
Haplogroup I1 is believed to have been present among Upper Paleolithic European hunter-gatherers as a minor lineage but due to its near-total absence in pre-Neolithic DNA samples it cannot have been very widespread. Neolithic I1 samples are very sparse as well, suggesting a rapid dispersion connected to a founder effect in the Nordic Bronze Age. Today it reaches its peak frequencies in Sweden (52 percent of males in Västra Götaland County) and western Finland (more than 50 percent in Satakunta province). In terms of national averages, I-M253 is found in 38-39% of Swedish males, 37% of Norwegian males, 34.8% of Danish males, 34.5% of Icelandic males, and about 28% of Finnish males. Bryan Sykes, in his 2006 book Blood of the Isles, gives the members – and the notional founding patriarch of I1 the name "Wodan".
All known living members descend from a common ancestor 6 times younger than the common ancestor with I2.
Before a reclassification in 2008, the group was known as I1a, a name that has since been reassigned to a primary branch, haplogroup I-DF29. The other primary branches of I1 (M253) are I1b (S249/Z131) and I1c (Y18119/Z17925).
More than 99% of living men with I1 belong to the DF29 branch which is estimated to have emerged in 2400 BCE. All DF29 men share a common ancestor born between 2500 and 2400 BCE. The oldest ancient individual with I1-DF29 found is Oll009, a man from early Bronze Age Sweden.