Abstract:
:Bipolar affective disorder (BPAD) is a common psychiatric disorder with complex genetic aetiology. We have undertaken a genome-wide scan in one of the largest samples of bipolar affected sibling pairs (ASPs) using a two-stage approach combining sample splitting and marker grid tightening. In this second stage analysis, we have examined 17 regions that achieved a nominally significant maximum likelihood LOD score (MLS) threshold of 0.74 (or 1.18 for the X-chromosome) in stage one. The second stage has added 135 ASP families to bring the total stage 2 sample to 395 ASPs. In total, 494 microsatellite markers have been used to screen the human genome at a density of 10 cM in the first stage sample (260 ASPs) and 5 cM in the second stage. Under the broad diagnostic model, two markers gave LOD scores exceeding 3 with two-point analysis: D4S392 (LOD=3.30) and D10S197 (LOD=3.18). Multipoint analysis demonstrated suggestive evidence of linkage between BPAD and chromosomal regions 6q16-q21 (MLS=2.61) and 4q12-q21 (MLS=2.38). 6q16-q21 is of particular interest because our data, together with those from two recent genome scans, make this the best supported linkage region in BPAD. Further, our data show evidence of a gender effect at this locus with increased sharing predominantly within the male-male pairs. Our scan also provides support for linkage (MLS> or =1.5) at several other regions that have been implicated in meta-analyses of bipolar disorder and/or schizophrenia including 9p21, 10p14-p12 and 18q22.
journal_name
Mol Psychiatryjournal_title
Molecular psychiatryauthors
Lambert D,Middle F,Hamshere ML,Segurado R,Raybould R,Corvin A,Green E,O'Mahony E,Nikolov I,Mulcahy T,Haque S,Bort S,Bennett P,Norton N,Owen MJ,Kirov G,Lendon C,Jones L,Jones I,Holmans P,Gill M,Craddock Ndoi
10.1038/sj.mp.4001684subject
Has Abstractpub_date
2005-09-01 00:00:00pages
831-41issue
9eissn
1359-4184issn
1476-5578pii
4001684journal_volume
10pub_type
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