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Psychiatr Genet ; 14(2): 101-6, 2004 Jun.
Article in English | MEDLINE | ID: mdl-15167697

ABSTRACT

Several studies provide suggestive evidence of a susceptibility locus for bipolar disorder at chromosome 21q22-23. In an attempt to replicate these findings, we have analyzed linkage to 11 polymorphic markers from this region in 18 Bulgarian pedigrees with affective disorder. Two-point linkage analysis under assumption of homogeneity and a dominant model with reduced penetrance produced modest positive values for some of the markers tested under a 'narrow' phenotype definition, including bipolar I and II, and schizoaffective disorder. The maximum two-point score (lod=1.76, theta=0.00) was at marker D21S1919. Non-parametric linkage analysis under the same phenotype model, yielded positive NPLall values (P<0.05) over the region between markers D21S211 and D21S416, with a peak at D21S1252 (NPL Zall=2.32, P=0.0003). The multipoint lod score (GENEHUNTER) reached a suggestive value for linkage (lod=2.10) also at marker D21S1252. The results under a recessive model were completely negative. These data add to the evidence for the existence of a susceptibility locus for bipolar affective disorder on chromosome 21q22.


Subject(s)
Bipolar Disorder/genetics , Chromosomes, Human, Pair 21/genetics , Genetic Predisposition to Disease/genetics , Bulgaria , Canada , Chromosome Mapping , Female , Humans , Jews , Lod Score , Male , Models, Genetic , Pedigree , United States
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