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Newfoundlanders might be the closest British equivalent to French Canadians/Afrikaners etc outside Europe. Mostly descended from a bottleneck of Southern English + Southern Irish from the 18th century.
https://www.biorxiv.org/content/10.1....486593v2.full
Abstract
The founder population of Newfoundland and Labrador (NL) is a unique genetic resource, in part due to geographic and cultural isolation, where historical records describe a migration of European settlers to NL in the 18th and 19th centuries. However, the fine-scale genetic structure and ancestry of the population has not been well described. Here, we leverage dense genome-wide SNP data on 1,807 NL individuals to reveal fine-scale genetic structure in NL that is clustered around coastal communities and correlated with Christian denomination. We show that the majority of NL European ancestry can be traced back to the south-east and south-west of Ireland and England. We date a substantial population size bottleneck approximately 10-15 generations ago in NL, associated with increased haplotype sharing and autozygosity. Our results elucidate novel insights into the population history of NL and demonstrate evidence of a population conducive to further genetic studies and biomarker discovery.
In my collected North American K13 averages, Newfoundlanders are unique in being closest to Southwest English (other British-majority states/provinces are closer to Southeast English)
Code:Distance to: Canada_Newfoundland 1.05418215 English_West-Country 1.29961533 Cornish 1.30988549 English_West-Midlands 1.45787517 English_Southeast 1.78204938 English_East-Midlands 1.94491645 English_East 2.24875521 English_Lancashire 2.42777676 English_Northeast 2.47776109 English_Yorkshire 2.68533052 Welsh_South Distance to: Canada_Newfoundland 0.88362888 English_Southwest 1.44041661 English_Midlands 1.46478667 English_Southeast 2.02155880 Welsh 2.07316184 English_North 3.14165561 Scottish 3.39972058 French_Brittany 3.70175634 Dutch 4.15594755 Dutch_Central 4.31965276 Dutch_South
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