Haplogroup J (mtDNA)
| Haplogroup J | |
|---|---|
| Possible time of origin | 45,000 years before present | 
| Possible place of origin | West Asia/Middle East | 
| Ancestor | JT | 
| Descendants | J1, J2 | 
| Defining mutations | 295 489 10398 12612 13708 16069 | 
Haplogroup J is a human mitochondrial DNA (mtDNA) haplogroup. The clade derives from the haplogroup JT, which also gave rise to haplogroup T. Within the field of medical genetics, certain polymorphisms specific to haplogroup J have been associated with Leber's hereditary optic neuropathy.