India’s Koṅkaṇ coast, a narrow strip of western shoreline famed for its cultural and ethnolinguistic diversity, has long resisted a clear genetic portrait. A new study in Heredity now maps the maternal ancestry of the Koṅkaṇī people in unprecedented detail, and its findings suggest the region served as a genuine genetic crossroads where Ice Age refuges, later migrations and strict social customs all left their mark.
The researchers analysed complete mitochondrial genomes from 85 individuals and hypervariable control-region sequences from 210 people belonging to the Koṅkaṇī population of the Koṅkaṇ Malabar coast. Because mitochondrial DNA is inherited only through the maternal line, these sequences trace the history of women’s lineages specifically, offering a complementary view to studies of the male-transmitted Y chromosome.
When the team compared its data with more than 5,000 mitochondrial genomes from across Eurasia, a layered picture emerged. The Koṅkaṇī maternal gene pool carries both deep-rooted South Asian lineages belonging to macro-haplogroup M and West Eurasian lineages, indicating that local ancestry draws on very old subcontinental roots as well as lineages that arrived from farther west.
According to the study, lineages within macro-haplogroup N were the primary drivers of internal genetic structuring within the population, meaning that the branching patterns among Koṅkaṇī groups trace largely to these N-line maternal lines.
One of the study’s most striking results concerns social organisation. The Koṅkaṇī population divides into Sārasvata and non-Sārasvata groups with clearly divergent maternal histories. Occupational groups such as the Khārvi and Kuḍubi show genetic signatures consistent with historic founder events followed by increased genetic drift, while Gauḍa Sārasvata Brahmins and Roman Catholics display higher haplotype diversity. The authors suggest that social practices, including endogamy — marriage within one’s own community — may contribute to these differences between populations.
Clustering analyses reinforce this split. The non-Sārasvata group clusters with autochthonous tribes of the region, whereas the Sārasvata groups share genetic affinities with West Eurasian and Steppe-linked lineages. The researchers argue that this pattern carries a broader implication: the Bronze Age migrations into South Asia were not exclusively male-mediated, since Steppe-linked signal appears here in maternally inherited DNA.
Taken together, the study frames the Koṅkaṇ coast as a genetic confluence shaped by Late Pleistocene migrations, Last Glacial Maximum refugia and Holocene admixture. It also illustrates how both climate shifts and social structures moulded the genetic diversity that persists along western India today.
As with any mitochondrial study, the conclusions describe maternal lineages only and cannot by themselves capture the full, biparental ancestry of the population. The sample sizes, though substantial for complete mitochondrial genomes, remain modest relative to the population’s diversity, and the demographic modelling reflects inferred history rather than directly observed events. Nevertheless, the work fills a long-standing gap: the maternal genetic landscape of the Koṅkaṇ region had remained largely unresolved, and this dataset now provides a reference point for understanding how deep time and social custom together shaped one of India’s most diverse coastal communities.
Subject of Research: Maternal genetic history of the Koṅkaṇī population of India based on mitochondrial genome analysis.
Article Title: Complex maternal genetic landscape in the Koṅkaṇī population of India
Article References: Sequeira, J. J., Kumar, L., van Driem, G., Thangaraj, K., & Mustak, M. S. (2026). Complex maternal genetic landscape in the Koṅkaṇī population of India. Heredity. https://doi.org/10.1038/s41437-026-00896-9
Image Credits: AI Generated
DOI: 10.1038/s41437-026-00896-9
Keywords: mitochondrial DNA, Konkani population, India, maternal lineages, haplogroup M, haplogroup N, Last Glacial Maximum, endogamy, founder events, Bronze Age migrations, Heredity, population genetics
News Source: Juliet Wilcox. (October 28, 2026). Ancient migrations and social rules shaped India’s Konkani maternal genetics. Scienmag.
