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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Genome-wide search in Finnish families with inflammatory bowel disease provides evidence for novel susceptibility loci.

Epidemiological and genetic linkage studies have indicated a strong genetic basis for development of inflammatory bowel disease (IBD) which was recently supported by discovery of the Crohn's disease (CD) susceptibility gene termed NOD2/CARD15. We carried out a genome-wide linkage study in Finnish IBD families, providing a particular advantage to map susceptibility genes for ulcerative colitis (UC) within a genetic isolate. Initially, 92 IBD families with 138 affected sib-pairs (ASPs), were genotyped for 429 markers spaced at approximately 10 cM intervals. Next, the loci on chromosomes 2p13-11, 11p12-q13, and 12p13-12 were high-density mapped in the extended family cohort of 130 families with 173 ASPs. In this study, the most significant lod scores were observed for the UC families on chromosome 2p11 (D2S2333), in the vicinity of the REG gene cluster which is strikingly overexpressed in the IBD mucosa. The maximum two-point lod score was 3.34 (dominant model), and the corresponding NPL score 2.61. For UC, the second highest two-point NPL score of 2.00 was observed at proximal 12p13, where also some evidence for linkage disequilibrium emerged (P=0.07 and P=0.007 for the basic and extended IBD cohorts, respectively). The highest two-point NPL score for the CD families was 2.34 at D12S78 (12q23) with significant evidence for linkage disequilibrium (P=0.004), and for the mixed (MX) families 2.07 at D4S406 near the linkage peak reported previously. This study confirmed several of the IBD loci that have previously been reported and gives evidence for new IBD loci on chromosomes 2p11, 11p12-q13, 12p13-12, 12q23, and 19q13.[1]


  1. Genome-wide search in Finnish families with inflammatory bowel disease provides evidence for novel susceptibility loci. Paavola-Sakki, P., Ollikainen, V., Heliö, T., Halme, L., Turunen, U., Lahermo, P., Lappalainen, M., Färkkilä, M., Kontula, K. Eur. J. Hum. Genet. (2003) [Pubmed]
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