Featured Posst

Major update reorganizes entire haplogroup I2 tree

Thursday, February 6, 2020

Another German in the Sardinian I-PF4190 branch: 2020-02-06 tree for I-CTS11338

Click here to download our 2020-02-06 tree for I-CTS11338

I-PF4190 is the largest branch of I-M26 on the island of Sardinia, approximately 75% of the I-M26 men in Sardinia belong to I-PF4190. Paolo Francalacci sequenced the Y chromosomes of 1200 Sardinia men, 464 of them belonged to I-M26 and 345 of these belonged to I-PF4190.

Francalacci was able to create a tree based on these sequences, his I-PF4190 tree had approximately 147 branches and hundreds or low thousands of SNPs.

This I-CTS11338 tree is based on commercial NGS Y chromosome sequences (the Big Y etc). Our shows only 5 branches in I-PF4190 and approximately 50 SNPs. I-PF4190 has a MRCA who lived approximately 4100 years ago. I  think this shows how much is remaining to be discovered about the Y-DNA tree.

This tree shows a new sample for a German ancestry men. When we see non-Sardinian men in I-PF4190, they often have German ancestry. He's not closely related to previous I-PF4190 German samples

For reasons of space we have moved the I-Z113 branch to a tree of its own, click here to find our first I-Z113 tree.


Click here to find our previous tree for I-CTS11338
Click here for a brief description of the I-CTS11338 haplogroup


  1. Is there any clear theory as to where this haplogroups main group emerged? Is it native to Sardinia or could it have started in Europe before expansion? Thank u

  2. Francalacci thought that I-PF4190 had its expansion in Sardinia (it's his I2a1a-δ clade) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5500864/

    I agree, I-PF4190 had a very rapid expansion as shown by Francalacci's tree. We see very few I-PF4190 outside of Sardinia, and when we find non-Sardinians who belong to I-PF4190, they belong to downstream branches as shown on our I-CTS11338 tree.

    I don't have an opinion about when the I-PF4190 founder arrived in Sardinia. I-M26 as a whole surely emerged somewhere else, not in Sardinia. Francalacci found some other clades of I-M26 that also have a long history of Sardinia, and he found some other I-M26 men that are likely descendants of men who arrived in the last 2000 years.