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Haplogroup O1a1b

O1a1b (Austronesian coastal Taiwan / Luzon lineage)

Macro-haplogroup

Parent clade

O1a1-CTS10887

Formed (estimate)

c. 9,000–11,000 years before present

TMRCA (estimate)

c. 4,000–5,000 years ago

O1a1b

Overview

O1a1b is a significant Taiwanese and northern Philippine paternal lineage, representing a later branching event within the broader CTS10887 radiation. While O1a1a represents early Neolithic Taiwan, O1a1b appears to correspond to secondary expansions from Taiwan into Luzon and coastal areas of the northern Philippines. Its presence in island Southeast Asia is tied to the second wave of Austronesian maritime dispersal.

Geographic distribution

Common among several Taiwanese indigenous groups, and present at meaningful frequencies in northern Philippine populations, particularly the Batanes archipelago and northern Luzon. Minor occurrences extend into maritime Southeast Asia through secondary expansions.

Ancient DNA

Archaeogenetic models of Taiwan–Philippines contact align with the estimated TMRCA of O1a1b.
O1a1b diversification overlaps with Austronesian maritime intensification after 3000 BCE.
Its spread southward matches pottery and tool continuity between Taiwan and northern Philippines.

Phylogeny & subclades

O1a1b is parallel to O1a1a under CTS10887. While not as large as O1a1a, it represents a distinct demographic wave with its own downstream radiation patterns.

O1a1b*
Local Philippine/Taiwan derivatives

Notes & context