We report further evidence for our previous suggestion [Garner et al., 2001: Am J Hum Genet 68:1061-1064] of a locus on 5q predisposing to bipolar I disorder (BP-I) in an extended Costa Rican pedigree. We genotyped additional microsatellite markers in this region and applied a multi-point non-parametric linkage analysis (SimWalk2). Significant identity-by-descent allele sharing among affected relatives was observed for all of the 20 markers tested in a segment of approximately 15 cM. Most affected individuals shared a single haplotype over this region; breaks within this haplotype may suggest a more restricted candidate location for a BP-I gene. These results support the suggestion that a locus at 5q31-33, together with a previously reported locus at 18q22-23, may provide the major genetic risk for BP-I in this family.
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