Abstract
Genome wide association (GWA) studies have successfully identified at least a dozen loci associated with orofacial clefts. However, these signals may be unique to specific populations and require replication to validate and extend findings as a prelude to etiologic SNP discovery. We attempted to replicate the findings of a recent meta-analysis of orofacial cleft GWA studies using four different ancestral populations. We studied 946 pedigrees (3,436 persons) of European (US white and Danish) and Asian (Japanese and Mongolian) origin. We genotyped six SNPs that represented the most significant P-value associations identified in published studies: rs742071 (1p36), rs7590268 (2p21), rs7632427 (3p11.1), rs12543318 (8q21.3), rs8001641 (13q31.1), and rs7179658 (15q22.2). We directly sequenced three non-coding conserved regions 200 kb downstream of SPRY2 in 713 cases, 438 controls, and 485 trios from the US, Mongolia, and the Philippines. We found rs8001641 to be significantly associated with nonsyndromic cleft lip with cleft palate (NSCLP) in Europeans (P-value = 4 × 10(-5), ORtransmission = 1.86 with 95% confidence interval: 1.38-2.52). We also found several novel sequence variants in the conserved regions in Asian and European sampl...Continue Reading
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