L0*

Origins and Evolution

mtDNA haplogroup L0* is the set of basal lineages that fall within the parent clade L0 but are not assigned to downstream named subclades (for example L0d, L0k, L0a). As a very early branch of macro-haplogroup L, L0* reflects deep maternal diversity that likely emerged in southern and eastern Africa during the Middle Pleistocene/Late Pleistocene transition. Coalescence estimates for L0 and basal L0 lineages are on the order of ~170 thousand years ago (kya), placing these lineages among the oldest known mtDNA branches in anatomically modern humans.

Subclades (if applicable)

By definition L0* denotes basal or unclassified L0 lineages rather than a specific downstream subclade. Known named subclades of L0 in the broader phylogeny include L0d, L0k, and L0a (the latter more common in eastern Africa and some Near East lineages). Where sequence resolution is low or diagnostic mutations for named subclades are absent, samples are reported as L0*. These basal lineages can represent either genuinely deep-branching maternal lines or undersampled/unspecified variants of recognized L0 subclades.

Geographical Distribution

L0* has its highest representation among Khoe‑San and other southern African forager groups, where deeply divergent L0 haplotypes remain common. It is also detected in parts of eastern Africa (including some Cushitic and Nilotic‑adjacent groups), at lower frequencies in Central African foragers, and sporadically in Bantu‑speaking populations due to regional admixture. Low-frequency occurrences outside sub-Saharan Africa — including North Africa, the Near East, and African‑descended populations in the Americas — reflect historical migrations and the transatlantic slave trade rather than primary centers of diversity. Ancient DNA finds assigned to L0* (including two samples in the referenced database) confirm the antiquity and long-term persistence of these lineages in southern African contexts.

Historical and Cultural Significance

Because L0 lineages are among the earliest-diverging human mtDNA clades, they are central to models of early modern human population structure, migration, and continuity within Africa. The concentration of deep L0 diversity in Khoe‑San groups supports a scenario of long-term local continuity of maternal lineages in southern Africa dating back to the Late Pleistocene. L0* (and related L0 subclades) therefore provide genetic evidence that complements archaeological records of Middle Stone Age and Later Stone Age foragers in southern and eastern Africa. In later periods, L0 lineages enter wider African population pools through gene flow associated with agricultural, pastoral, and migratory events such as the Bantu expansions and historic movements, which explains their presence at low frequency in many African populations and in diaspora communities.

Conclusion

mtDNA haplogroup L0* is not a single homogeneous cluster but a label for basal maternal lineages within L0 that are crucial for understanding deep human maternal ancestry in Africa. Its age, distribution, and persistence among Khoe‑San and other populations make L0* a key lineage for reconstructing Late Pleistocene demography and the subsequent population dynamics within and beyond southern Africa.