A · A1 · A1b · A1b1 · BT · CT · CF · F · G · G2 · G2a · G2a8 · G2a8a
G-FGC5672
G2a8a represents an early branch of the G2a8 lineage and likely originated in populations inhabiting the transitional ecotones between the Central Zagros and the northern Mesopotamian plains. Archaeogenetic correlations imply that G2a8a reflects pastoral–agropastoral societies engaged in seasonal transhumance and early metallurgical economies. The lineage did not undergo large-scale expansions but remained a stable regional component of the prehistoric West Asian paternal landscape.
Modern presence is strongest in western Iran (Kermanshah–Ilam–Luristan corridor), northern Mesopotamia, and eastern Turkey. Lower-frequency occurrences are found among Kurds, Lurs, and certain Iraqi Arab subpopulations. Its concentration mirrors early exchange networks linking the Zagros highlands with urbanizing Mesopotamian centers.
G2a8a is the primary identified daughter branch of G2a8, defined by FGC5672 and associated markers. Phylogenetic structure is moderately deep, featuring small regional lineages concentrated around the western Zagros. The branch stands within the highland–foothill cluster of G2a radiations.
G2a8a contributes to reconstructing the demographic layers of the Zagros–Mesopotamian interaction sphere. Its stable regional structure and moderate diversity support continuity from the Chalcolithic period through the Bronze Age and into modern populations.