Haplogroup O (mtDNA)
Haplogroup O mtDNA is a haplogroup derived from haplogroup N and found in Oceania. Specifically, it is found among Aboriginal Australians. Its defining mutations are G6755A, C9140T, and G16213A.
It is one of the rarest haplogroups. As of 2022, FamilyTreeDNA reports that only 4 people in their customer base who have tested their complete mitochondrial sequences are members of the haplogroup. YFull reports 9 known members, 8 of whom are stated to be from Australia, and that the haplogroup is at least 20,000 years old.
The following table lists relevant GenBank samples:
| Phylotree Haplogroup | YFull Haplogroup | GenBank ID | Alternate ID | State/Region |
| O | O-a1 | AUS41 | Queensland | |
| O | O-a1a | Aus23 | Northern Territory | |
| O | O-a1a | AUS39 | Queensland | |
| O | O-a1a | AUS40 | Queensland | |
| O1 | O-a2 | AUS38 | Queensland | |
| O1 | O1 | AUD38 | Northern Territory desert | |
| O1a | O1a | Aus20 | Northern Territory | |
| O1a | O1a | Aus22 | Northern Territory |
Subclades
Tree
- O
- * O-a1
- ** O-a1a
- * O1
- ** O-a2
- * O1
- ** O1a