Overview
J1-ZS1307 is a downstream lineage of the Arabian-centered J1-L147.1 cluster and originated among pastoral groups inhabiting the northern Arabian desert zone during the late Neolithic through the early Bronze Age. These early communities relied on desert wells, wadis and rotational grazing patterns that shaped their mobility. Their ecological niche and movement patterns aligned with the broader northern Arabian tribal substrate that later formed the foundation of early Semitic-speaking populations. During the Bronze and Iron Ages, ZS1307-bearing groups took part in the regional expansions of North Arabian tribes across the Hejaz, Transjordan and western Mesopotamia. The downstream structure of the lineage shows localized founder effects tied to clan systems. Early Islamic era mobility spread certain subbranches into Iraq and the Gulf, creating additional centers of downstream diversification.