Abstract
To reassess the type I diabetes (T1D) association of the OAS1 locus, the Type I Diabetes Genetics Consortium (T1DGC) genotyped 11 tag single-nucleotide polymorphisms spanning approximately 41 kb from the 5' to 3' flanking region. For each sample obtained from over 2000 affected sib-pair families from nine cohorts, the genotyping was performed on both the Illumina Golden Gate and Sequenom iPlex platforms. The data suggest that there may be a weak association with T1D for two OAS1 polymorphisms, rs3741981 and rs10774671, in populations of European descent. The OAS1 locus is close to a recently identified T1D-associated linkage disequilibrium (LD) block in human chromosome 12q24. Extended LD in populations earlier examined may account for the prior observation of an association of T1D with OAS1 variants. This possibility needs to be addressed further by fine mapping of the T1D association represented in 12q24.
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