mtDNA Haplogroup J1 Relative Frequency Maps

The maximum frequency is in Iceland due to founder effects, mostly from NW European lineages of J1c but also in one of the NW European lines of J1b known as J1b1a1a. Maps of both below.

Relative frequency maps for the six child lineages J1 below computed by mt Heatmap based on YFull MTree version 1.02.16447.

These six maps use default radius of 250km except for J1d where I adjusted the radius to 300km because I thought it would help smooth out the gradient in Central Asia.

In general I think 250km is good to use if there are enough data points.

For details on how the radius is calculated based on the area of the YFull MTree geocode, please refer to the documentation:

mt Heatmap

J1a
J1b
J1c
J1d
J1e
J1f

J1b has a very prolific lineage, J1b1, which accounts for most of J1b's presence in Europe. J1b is otherwise more frequent and has highest diversity between the Arabian Peninsula and Central Asia and South Asia.

J1b1 as a whole appears to have the highest frequency between the northern Persian Gulf of Iraq and Iran to the borders of Central and South Asia.

Note that per the mt Heatmap's actual computation, the highest frequencies are on part of the Greenland coast (edge effect from actual Iceland sample), Iceland and the Faroe Islands. This is caused by two ancient samples both of which are in the same branch J1b1a1a, TMRCA estimated 1200 ybp.

J1b1 has three children.

J1b1a
J1b1b
J1b1f

J1b1a1 has three children. J1b1a is by far the most prolific.

J1b1a1
J1b1a2
J1b1a3_fixed

J1b1a1 has 25 child branches. This is too many to look at each one individually for me at this time. In the future I should develop a diversity map view for the mt tree that will facilitate the analysis of the deeper origins.

I will note that the two oldest samples are from Iron Age Kazakhstan, followed by an Iron Age sample from Grosseto, Italy.

One of the ancient samples from Kazakhstan, ESZ001, is in J1b1a1-a, which has highest frequency and diversity in a wide swath from Kazakhstan to the Persian Gulf.

One sample not displayed is missing a geocode but has language code Burushaski. I could modify my software to count such samples as Gilgit-Baltistan, Pakistan.

In the Old World, J1b1a1a is only found in the British Isles, including in the Shetland Islands, Faroe Islands, Iceland and western Scandinavia.

J1b1a1b notably has two samples dating to 2250 ybp and 2200 ybp from Czechia and Hampshire, UK. It is found from Europe to Ukraine and Russia. No samples from Asia on the YFull MTree.

It seems challenging to me to theorize on the origin of J1b1a1 given that most of its lineages are found in Europe, yet the two oldest samples, in different branches, are found in Iron Age Kazakhstan, an area that is closer to the deeper diversity of J1b1.

It could be that many or most of the European lineages of J1b1a1 actually descend from a single, European origin MRCA that lived sometime after J1b1a1 and whose mtDNA didn't accumulate a traceable mutation.

These posts are the opinion of Hunter Provyn, a haplogroup researcher in J-M241 and J-M102.

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