Overview
J1-Y6684 is a downstream lineage of the Arabian-centered J1-P58 radiation and likely developed among pastoralist populations inhabiting northern Arabia during the early Bronze Age. These groups relied on desert-steppe grazing systems organized around wells, ephemeral streams and oasis-linked corridors. Their seasonal mobility routes paralleled the pathways that would later define the demographic landscape of early North Arabian tribal societies. During the Bronze and Iron Ages, Y6684-bearing groups participated in expansions spreading across the Hejaz, Wadi Sirhan and the arid margins of southern Jordan. The downstream topology of the lineage shows several founder-driven events tied to early tribal segmentation. In the early Islamic period, Y6684 lineages dispersed eastward into Iraq and the Gulf region, forming new microbranches through localized expansion.