A genome screen for genes predisposing to bipolar affective disorder detects a new susceptibility locus on 8q

Author: Borrmann-Hassenbach M.  

Publisher: Oxford University Press

ISSN: 1460-2083

Source: Human Molecular Genetics, Vol.10, Iss.25, 2001-12, pp. : 2933-2944

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Abstract

Bipolar affective disorder (BPAD), also known as manic depressive illness, is a severe psychiatric disorder characterized by episodes of mania and depression. It has a lifetime prevalence of ∼1% in all human populations. In order to identify chromosomal regions containing genes that play a role in determining susceptibility to this psychiatric condition, we have conducted a complete genome screen with 382 markers (average marker spacing of 9.3 cM) in a sample of 75 BPAD families which were recruited through an explicit ascertainment scheme. Pedigrees were of German, Israeli and Italian origin, respectively. Parametric and non-parametric linkage analysis was performed. The highest two-point LOD score was obtained on 8q24 (D8S514; LOD score = 3.62), in a region that has not attracted much attention in previous linkage studies of BPAD. The second best finding was seen on 10q25–q26 (D10S217; LOD score = 2.86) and has been reported in independent studies of BPAD. Other regions showing ‘suggestive’ evidence for linkage localized to 1p33–p36, 2q21–q33, 3p14, 3q26–q27, 6q21–q22, 8p21, 13q11 and 14q12–q13. In addition, we aimed at detecting possible susceptibility loci underlying genomic imprinting by analyzing the autosomal genotype data with the recently developed extension of the GENEHUNTER program, GENEHUNTER-IMPRINTING. Putative paternally imprinted loci were identified in chromosomal regions 2p24–p21 and 2q31–q32. Maternally imprinted susceptibility genes may be located on 14q32 and 16q21–q23.

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