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Haplogroup J (mtDNA)

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Haplogroup J
Possible time of origin 45000 years before present
Possible place of origin Western Asia
Ancestor JT
Defining mutations J* = 16069. (CR) 10398G, 12612G, 13708A. J1* = 16261. J1a = 16222, 16172. J2 = 16193. (CR) 7476T, 15257A. J2a = 16231. (CR) 10499G, 11377A. J2a1 = (CR) 1850C, 7789A, 13722G, 14133G. J1b = 14798. J1c = 16193. J2b = 16193, 16278.

Haplogroup J is a human mitochondrial DNA (mtDNA) haplogroup. Haplogroup J derives from the haplogroup JT, which also gave rise to Haplogroup T. In his popular book The Seven Daughters of Eve, Bryan Sykes named the originator of this mtDNA haplogroup Jasmine. Within the field of medical genetics, certain polymorphisms specific to haplogroup J have been associated with Leber's hereditary optic neuropathy. [1]

Origins Edit

Around 45,000 years before present, a mutation took place in the DNA of a woman who lived in the Anatolian-Caucasus region. Further mutations took place in the J line which can be identified as J1a1 (27,000 yrs ago), J2a (19,000 yrs ago), J2b2 (16,000 years ago), J2b3 (5,800 yrs ago), etc. Haplogroup J (along with ‘T’) is associated with the spread of farming and herding in Europe during the Neolithic Era (8,000-10,000 yrs ago). All other West Eurasian-origin groups (H, V, U, K, W, I, X) were previously given to hunting and gathering.

Locale Edit

Average frequency of J Haplogroup as a whole is highest in the Near East (12%), followed by Europe (11%), Caucasus (8%) and North Africa (6%). Of the two main sub-groups, J1 takes up four-fifths of the total and is spread on the continent while J2 is more localised around the Mediterranean, notably in Turkey, Greece, Italy/Sardinia and Spain. A surprising presence of J2 (10%) amongst the Mansi of Ob river valleys indicates a Neolithic Phase expansion towards the Urals. East of the Caucasus, occurrence of J2 has been noted in Northern Iran at 5%, Azerbaijan at 3% and Turkmenistan at 3%. In Pakistan, where West Eurasian lineages occur at frequencies of up to 50% in some ethno-linguistic groups, J1 averages around 5%, while J2 occurrence is very rare. Intriguingly, however, it is found amongst 9% of Kalash, a small ethnic community dwelling in the Hindu Kush mountains of

Distribution within Europe Edit

Within Europe, >2% frequency distribution of mtDNA J is as follows [2]:

J* = Ireland - 12%, England-Wales - 11%, Scotland - 9%, Orkney - 8%, Germany - 7%, Russia (European) - 7%, Iceland - 7%, Bulgaria-Turkey - 6%, Austria-Switzerland - 5%, Finland-Estonia - 5%, Spain-Portugal - 4%, France-Italy - 3%

J1 = Bulgaria-Turkey - 5%

J1a = Austria-Switzerland - 3%

J1b1 = Scotland - 4%

J2 = Bulgaria-Turkey - 3%, France-Italy - 2%

J2a = Homogenously spread in Europe. Absent in the nations around the Caucasus. Not known to be found elsewhere. [3]

J2b1 = Virtually absent in Europe. Found in diverse forms in the Near East. [4]

Coalescence times for the subclades of mitochondrial haplogroup J Edit

Subclade European coalescence time [5] Near East coalescence time [6]
J1a1 27,300 years (+/− 8,000 years) 17,700 years (+/− 2,500 years)
J1a2 7,700 years (+/− 3,500 years)
J1b 5,000 years (+/− 2,200 years) 23,300 years (+/− 4,300 years)
J2a 19,200 years(+/− 6,900 years)
J2b1 15,000 years (+/− 5000 years)
J2b2 161,600* years (+/− 8,100 years) 16,000 years (+/− 5,700 years)
J2b3 5,800 years (+/− 2,900 years)

*Typographical error from original source material as per time table describing the spread of populations given in the same study.

See also Edit

External links Edit

Human mitochondrial DNA (mtDNA) haplogroups

  most recent common mt-ancestor    
L0   L1  
L2 L3   L4 L5 L6 L7
  M N  
CZ D E G Q   A I O   R   S W X Y
C Z B F pre-HV   pre-JT P  UK
HV JT U K
H V J T
This page uses content from the English language Wikipedia. The original content was at Haplogroup J (mtDNA). The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.

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