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Genome-wide patterns of identity-by-descent sharing in the French Canadian founder population

Gauvin Héloïse, Moreau Claudia, Lefebvre Jean-François, Laprise Catherine, Vézina Hélène, Labuda Damian et Roy-Gagnon Marie-Hélène. (2014). Genome-wide patterns of identity-by-descent sharing in the French Canadian founder population. European Journal of Human Genetics, 22, p. 814-821.

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In genetics the ability to accurately describe the familial relationships among a group of individuals can be very useful. Recent statistical tools succeeded in assessing the degree of relatedness up to 6–7 generations with good power using dense genome-wide single-nucleotide polymorphism data to estimate the extent of identity-by-descent (IBD) sharing. It is therefore important to describe genome-wide patterns of IBD sharing for more remote and complex relatedness between individuals, such as that observed in a founder population like Quebec, Canada. Taking advantage of the extended genealogical records of the French Canadian founder population, we first compared different tools to identify regions of IBD in order to best describe genome-wide IBD sharing and its correlation with genealogical characteristics. Results showed that the extent of IBD sharing identified with FastIBD correlates best with relatedness measured using genealogical data. Total length of IBD sharing explained 85% of the genealogical kinship’s variance. In addition, we observed significantly higher sharing in pairs of individuals with at least one inbred ancestor compared with those without any. Furthermore, patterns of IBD sharing and average sharing were different across regional populations, consistent with the settlement history of Quebec. Our results suggest that, as expected, the complex relatedness present in founder populations is reflected in patterns of IBD sharing. Using these patterns, it is thus possible to gain insight on the types of distant relationships in a sample from a founder population like Quebec.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 814-821
Version évaluée par les pairs:Oui
Identifiant unique:10.1038/ejhg.2013.227
Sujets:Sciences sociales et humaines > Sciences humaines > Histoire
Sciences sociales et humaines > Sciences sociales > Démographie
Sciences de la santé > Sciences médicales > Génétique
Département, module, service et unité de recherche:Départements et modules > Département des sciences humaines
Mots-clés:identity-by-descent, relatedness, founder population, population structure, genealogical data, SNP data
Déposé le:08 oct. 2022 15:57
Dernière modification:08 oct. 2022 15:57
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