Haplogroup S also known as S-B254 is a human

Y-DNA haplogroup In human genetics, a human Y-chromosome DNA haplogroup is a haplogroup defined by mutations in the non- recombining portions of DNA from the male-specific Y chromosome (called Y-DNA). Many people within a haplogroup share similar numbers of sh ...

, defined by the SNPs B254 and Z33355.International Society of Genetic Genealogy (ISOGG; 2017), ''Y-DNA Haplogroup Tree 2015''
(24 March 2017). Until 2016, it was known as Haplogroup S1. S-M254 is the most common haplogroup among males in the Papua New Guinea Highlands. It is also relatively common in some parts of

Oceania Oceania (, , ) is a region, geographical region that includes Australasia, Melanesia, Micronesia, and Polynesia. Spanning the Eastern Hemisphere, Eastern and Western Hemisphere, Western hemispheres, Oceania is estimated to have a land area of ...

Wallacea Wallacea is a biogeographical designation for a group of mainly Indonesian islands separated by deep-water straits from the Asian and Australian continental shelves. Wallacea includes Sulawesi, the largest island in the group, as well as Lo ...

and among

indigenous Australians Indigenous Australians or Australian First Nations are people with familial heritage from, and membership in, the ethnic groups that lived in Australia before British colonisation. They consist of two distinct groups: the Aboriginal peoples ...

. In a major correction to the phylogenetic tree during 2016,

Haplogroup S-M230 Haplogroup S-M230, also known as S1a1b (and previously as S* or K2b1a4), is a Y-chromosome DNA haplogroup. It is by far the most numerically significant subclade of Haplogroup S1a (and its sole primary subclade, Haplogroup S-P405). S-M230 is c ...

was "demoted" from the position of basal clade S*, becoming S1a1b, while S-B254 was "promoted" in its place to the level of S*. It has two primary subclades: S1 (B255) and S2 (P378). The existence of a third subclade, defined by the SNP, P336 has not been confirmed.

Footnotes

{{Y-DNA S