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Liu, C. et al.

Liu, Badner, Christian, Guroff, Detera-Wadleigh, Gershon,

Fine mapping supports previous linkage evidence for a bipolar disorder susceptibility locus on 13q32.

A region between D13S71 and D13S274 on 13q32 showed linkage to bipolar disorder (BP) based on a genome scan using markers with an average spacing of approximately 6 cM and an average heterozygosity of approximately 60% [Detera-Wadleigh et al., 1999: Proc Natl Acad Sci USA 96:5604-5609]. In an attempt to confirm this finding and achieve fine mapping of the susceptibility region, nine additional microsatellite markers with average heterozygosity of approximately 86%, located between D13S71 and D13S274, were typed in the same sample. The strongest linkage evidence was detected by multipoint linkage analysis (ASPEX program) around D13S779-D13S225 with maximum LOD score of 3.25 under Affection Status Model II (ASM II; P = 0.0000546). Data from additional nine markers resulted in a decrease of the 95% confidence interval of the linkage region. Association analyses with GASSOC TDT and ASPEX/sib_tdt detect potential linkage disequilibrium with several markers, including D13S280 (ASPEX TDT P = 0.0033, ASM I). These data generated using a higher marker density within the proposed susceptibility region strengthen the validity of our previous findings and suggest a finer localization of the susceptibility gene(s) on 13q32.[1]

References

Fine mapping supports previous linkage evidence for a bipolar disorder susceptibility locus on 13q32. Liu, C., Badner, J.A., Christian, S.L., Guroff, J.J., Detera-Wadleigh, S.D., Gershon, E.S. Am. J. Med. Genet. (2001) [Pubmed]

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