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2013
- handle: 10670/1.jo1dhz
- Moreau Claudia, Lefebvre Jean-François, Jomphe Michèle, Bhérer Claude, Ruiz-Linares Andres, Vézina Hélène, Roy-Gagnon Marie-Hélène et Labuda Damian. (2013). Native American admixture in the Quebec founder population. PLoS ONE, 8, (6), e65507.
- doi: 10.1371/journal.pone.0065507
Ce document est lié à :
https://constellation.uqac.ca/id/eprint/8284/
Ce document est lié à :
https://dx.doi.org/doi:10.1371/journal.pone.006550 [...]
Ce document est lié à :
doi:10.1371/journal.pone.0065507
Mots-clés
Histoire Démographie Quebec native American people population genetics genomics Europe computer software gene mapping paleogeneticsSujets proches
Populations, Human Human populations Population growth Human population Demography DemographicsCiter ce document
Claudia Moreau et al., « Native American admixture in the Quebec founder population », Constellation - Université du Québec à Chicoutimi, ID : 10.1371/journal.pone.0065507
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Résumé
For years, studies of founder populations and genetic isolates represented the mainstream of genetic mapping in the effort to target genetic defects causing Mendelian disorders. The genetic homogeneity of such populations as well as relatively homogeneous environmental exposures were also seen as primary advantages in studies of genetic susceptibility loci that underlie complex diseases. European colonization of the St-Lawrence Valley by a small number of settlers, mainly from France, resulted in a founder effect reflected by the appearance of a number of population-specific disease-causing mutations in Quebec. The purported genetic homogeneity of this population was recently challenged by genealogical and genetic analyses. We studied one of the contributing factors to genetic heterogeneity, early Native American admixture that was never investigated in this population before. Consistent admixture estimates, in the order of one per cent, were obtained from genome-wide autosomal data using the ADMIXTURE and HAPMIX software, as well as with the fastIBD software evaluating the degree of the identity-by-descent between Quebec individuals and Native American populations. These genomic results correlated well with the genealogical estimates. Correlations are imperfect most likely because of incomplete records of Native founders’ origin in genealogical data. Although the overall degree of admixture is modest, it contributed to the enrichment of the population diversity and to its demographic stratification. Because admixture greatly varies among regions of Quebec and among individuals, it could have significantly affected the homogeneity of the population, which is of importance in mapping studies, especially when rare genetic susceptibility variants are in play.