R1b* (that is R1b with no subsequent distinguishing SNP mutations) is extremely rare. The only population yet recorded with a definite significant proportion of R1b* are the Kurds of southeastern Kazakhstan with 13%. However, more recently, a large study of Y-chromosome variation in Iran, revealed R1b* as high as 4.3% among Persian sub-populations. In a study of Jordan it was found that no less than 20 out of all 146 men tested (13.7%), including most notably 20 out of 45 men tested from the Dead Sea area, were positive for M173 (R1) but negative for P25 and M269, mentioned above, as well as the R1a markers SRY10831.2 and M17, so they are either R1b* or R1a*. Hassan et al. (2008) found an equally surprising 14 out of 26 (54%) of Sudanese Fulani who were M173+ and P25-. Wood et al. report 2 Egyptian cases of R1-M173 which were negative for SRY10831 (R1a1) and P25 (R1b1), out of a sample of 1,122 males from various African countries, including 92 from Egypt. Such cases could possibly be either R1b* (R-M343*) or R1a* (R-M420*) (demonstrating the importance of checking exact mutations tested when comparing findings in this field).
It is however also possible that some of the rare examples represent a reversion of marker P25 from a positive back to a negative ancestral state.
Read more about this topic: Haplogroup R1b (Y-DNA)
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