ادامه کامنت قبل ویژه انزابی:
Consistent with the rest of the Arabian Peninsula, haplogroup J is the most abundant component in Saudi Arabia embracing 58% of its Y-chromosomes. Its two main subclades (J1-M267 and J2-M172), show opposite latitudinal gradients in the Middle East. J-M267 is more abundant in the southern areas, reaching a frequency around 73% in Yemen, whereas J2-M172 is more common in the Levant. Most probably, the significant higher presence of J2-M172 in Saudi compared to other Arabian populations is due to the larger northern boundary that Saudi Arabia shares with the Levant. The Fertile Crescent region has been considered the most probable origin of the earliest dispersions of both subclades [21,32,33]. Further subdivisions of J1-M172 have uncovered more recent Bronze a
ادامه کامنت قبل ویژه انزابی:
ادامه کامنت قبل ویژه انزابی:
اسامه
In a similar way, it is possible that J2-M47 signals a more recent expansion from the Levant that also affected the Arabian Peninsula. The peculiar distribution of J2-M67 in Arabia could be explained assuming maritime contacts from classical Mediterranean cultures. The presence in Saudi Arabia of three males harbouring underived J1-M304 chromosomes is intriguing. It could be that they came together with the J1-M267 or J2-M172 expansive waves, or they could represent the remnants of an old and geographically widespread Palaeolithic substrate. This type of underived chromosomes has been detected rarely in Turkey [21], in Oman and in the eastern Mediterranean area [34]. However, as the critical Levantine region has not yet been adequately dissected for J1, it seems premature to favor any of these hypotheses. The geographic pattern and most probable origin of the Y-chromosome haplogroup J in Arabia faithfully mirrors those found for the most prevalent J and R0a mtDNA haplogroups in the same region [7-9,12]. In addition, J1-M267 divergence age calculated for Saudi Arabia (11.6 ± 2 kya) and Yemen (11.3 ± 2 kya) are also very coincidental with those calculated for J1b (11.1 ± 8.4 kya) and R0a1 (9.6 ± 2.9 kya) in Saudi Arabia [7,8]. It is worth mentioning that J1-M267 ages in Saudi Arabia and Yemen are significantly older than those obtained for UAE and Qatar (Table (Table33)[15] and for Oman [14] pointing to a