H1C*

Origins and Evolution

H1C* (the star indicating basal H1C lineages not nested within downstream subclades) is a daughter clade of haplogroup H1, one of the most common and widespread maternal lineages in Western Europe. Haplogroup H1 as a whole expanded strongly after the Last Glacial Maximum (LGM) from refugia in the Iberian/Atlantic region; H1C likely formed during this post‑LGM re‑expansion phase and acquired distinguishing control‑region and coding‑region mutations that separate it from other H1 subclades. The estimated age for H1C is consistent with a Late Mesolithic / early Holocene origin in Iberia or nearby Atlantic France, with later dispersal accompanying both hunter‑gatherer movements and subsequent Neolithic and post‑Neolithic population processes.

Subclades

H1C* refers to basal H1C lineages that have not been assigned to further defining downstream subclades (i.e., not H1c1, H1c2 if present in specific phylogenies). Research on H1 and its subclades shows a number of localized branches (H1b, H1c, H1d, H1e, H1* etc.), some of which have regional signatures. For H1C specifically, published phylogenies identify H1c as a distinct cluster within H1, and H1C* designates samples that match H1C diagnostic mutations but lack additional derived mutations that define named sub-branches. Continued sequencing of complete mitogenomes sometimes resolves H1C* into new subclades as more samples are analyzed.

Geographical Distribution

H1C* is concentrated in the western portion of Europe with measurable presence in northwest Africa and scattered occurrences elsewhere in Europe and the Near East. Highest frequencies and diversity typically occur in the Iberian Peninsula and nearby Atlantic France, consistent with an origin there. It is also present in Western Europe (Britain, Ireland, France), Mediterranean regions and islands (Italy, Sardinia, Sicily), parts of Scandinavia at low–moderate frequency, and in northwest African populations (Moroccan and Algerian Berber groups), reflecting prehistoric maritime and coastal connections across the Atlantic and western Mediterranean.

Historical and Cultural Significance

H1C* carriers likely participated in multiple demographic episodes that shaped western Eurasia: the post‑LGM Mesolithic re‑expansion out of Iberian refugia, interactions between Mesolithic hunter‑gatherers and incoming Neolithic farmers, and later movements during the Bronze Age and historic periods (including coastal trade and population exchange). H1 and its subclades, including H1C, are commonly detected in ancient DNA studies from Mesolithic and later archaeological contexts in Western Europe and occasionally in North Africa, underscoring their long‑term presence in these regions. In the context of archaeological cultures, H1C lineages may appear among individuals associated with Mesolithic coastal groups, Neolithic farmer communities in western Mediterranean zones, and in some Bell Beaker‑associated contexts where western European maternal lineages expanded with cultural change.

Conclusion

H1C* is a western‑Atlantic rooted maternal lineage within haplogroup H1 that reflects the post‑LGM recolonization of Western Europe and continued presence through Mesolithic, Neolithic, and later periods. Its highest diversity in Iberia and presence in northwest Africa and western Mediterranean islands supports a scenario of long‑standing coastal and near‑coastal population continuity with occasional long‑distance dispersal. As mitogenome sampling improves, some H1C* individuals will likely be resolved into finer subclades, refining the picture of micro‑regional movements within the broader H1 expansion.