Overview
J1-ZS1244 is a downstream branch of the Arabian-rooted J1-L147.1 expansion and originated among pastoral populations of the northern Arabian steppe during the late Neolithic to early Bronze Age. These populations operated within ecological systems shaped by desert wells, wadis and seasonal grazing niches, forming the demographic substrate that later gave rise to North Arabian tribal traditions. During the Bronze and Iron Age periods, ZS1244-bearing populations contributed to the emergence of regionally defined clan structures across the Hejaz, Najd and western Mesopotamia. Its phylogeny reflects multiple founder effects and localized tribal segmentation. Early Islamic movements broadened the distribution of certain downstream branches, specifically into Iraq and the Gulf.