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Am J Med Genet ; 88(5): 567-87, 1999 Oct 15.
Article in English | MEDLINE | ID: mdl-10490718

ABSTRACT

We completed a genome-wide scan for susceptibility loci for bipolar affective disorders in families derived from a rather homogeneous population in the Province of Québec. The genetic homogeneity of this population stems from the migration of founding families into this relatively isolated area of Québec in the 1830s. A possible founder effect, combined with a prevalence of very large families, makes this population ideal for linkage studies. Genealogies for probands can be readily constructed from a population database of acts of baptism and marriage from the early 1830s up to the present time (the BALSAC register). We chose probands with a DSM III diagnosis of bipolar affective disorder and who may be grouped within large families having genealogical origins with the founding population of the Saguenay-Lac-St-Jean area. Living members (n approximately 120) of a very large pedigree were interviewed using the Structured Clinical Interview for DSM III (SCID I), SCID II, and with a family history questionnaire. A diagnostic panel evaluated multisource information (interview, medical records, family history) and pronounced best-estimate consensus diagnoses on all family members. Linkage, SimAPM, SimIBD, and sib-pair analyses have been performed with 332 microsatellite probes covering the entire genome at an average spacing of 11 cM. GENEHUNTER and haplotype analyses were performed on regions of interest. Analysis of a second large pedigree in the same regions of interest permitted confirmation of presumed linkages found in the region of chromosome 12q23-q24.


Subject(s)
Bipolar Disorder/genetics , Chromosomes, Human, Pair 12 , Genetic Linkage , Chromosomes, Human, Pair 5 , Female , Follow-Up Studies , Genetic Heterogeneity , Genetic Markers , Genetic Predisposition to Disease , Genetic Testing , Genotype , Haplotypes , Humans , Lod Score , Male , Pedigree , Quebec
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