Abstract
While subtle yet discrete clusters of genetic identity across Ireland and Britain have been identified, their demographic history is unclear. Using genotype data from 6,574 individuals with associated regional Irish or British ancestry, we identified genetic communities by applying Leiden community detection. Using haplotype segments segregated by length as proxy for time, we inferred regional Irish and British demographic histories. For a subset of the Irish communities, we provide genealogical context by estimating the enrichment/depletion of surnames.
Through patterns of haplotype sharing, we find evidence of recent population bottlenecks in Orcadian, Manx and Welsh genetic communities. We observed temporal changes in genetic affinities within and between genetic communities in Ireland and Britain. While structure in Ireland is subtler when compared to British communities, the Irish groups share relatively more short haplotype segments. In addition, using effective population size estimates and levels of haplotype-sharing, we detected varying degrees of genetic isolation in some Irish and British genetic communities across time. Further, we observe a stable migration corridor between north-east Ireland and south-west Scotland while there is a recent migration barrier between south-east and west Ireland. Genealogical analysis of surnames in Ireland reflects history - Anglo-Norman surnames are enriched in the Wexford community while Scottish and Gallowglass surnames were enriched in the Ulster community.
Using these new insights into the regional demographic history of Ireland and Britain across different time periods, we hope to understand the driving forces of rare allele frequencies and disease risk association within these populations.