BACKGROUND: Nonsyndromic cleft lip with or without cleft palate (NSCL/P) is a common birth defect of complex etiology. Several genes have been implicated in the etiology of NSCL/P, although only a few have been replicated across datasets. METHODS: ARHGAP29 was suggested as a candidate gene for NSCL/P as it is located in close proximity to ABCA4 (1p22), a gene previously identified in a genome-wide association study of NSCL/P. RESULTS: Rare, potentially damaging, coding variants in ARHGAP29 were found in NSCL/P cases, and its expression was detected during murine craniofacial development. In this study, we investigated whether variations in ARHGAP29 were associated with NSCL/P in our family based dataset. Five single-nucleotide polymorphisms (SNPs) flanking and within ARHGAP29 were genotyped in our NSCL/P datasets consisting of simplex and multiplex families of non-Hispanic white (NHW, primarily European) and Hispanic ethnicities. Results showed strong association of three ARHGAP29 SNPs with NSCL/P in the NHW families. Two intronic SNPs (rs1541098 and rs3789688) showed strong association with NSCL/P in all NHW families (p = 0.0005 and p = 0.0002, respectively), and simplex NHW families (p = 0.003 for both SNPs). A SNP in the 3' untranslated region (rs1576593) also showed strong association with NSCL/P in all NHW families (p = 0.002), and the multiplex subset (p = 0.002). ARHGAP29 SNP haplotypes were also associated with NSCL/P. Evidence of gene-gene interaction was found between ARHGAP29 and additional cleft susceptibility genes. CONCLUSION: This study further supports ARHGAP29 as a candidate gene for human NSCL/P in families of Caucasian descent.
BACKGROUND:Nonsyndromic cleft lip with or without cleft palate (NSCL/P) is a common birth defect of complex etiology. Several genes have been implicated in the etiology of NSCL/P, although only a few have been replicated across datasets. METHODS:ARHGAP29 was suggested as a candidate gene for NSCL/P as it is located in close proximity to ABCA4 (1p22), a gene previously identified in a genome-wide association study of NSCL/P. RESULTS: Rare, potentially damaging, coding variants in ARHGAP29 were found in NSCL/P cases, and its expression was detected during murine craniofacial development. In this study, we investigated whether variations in ARHGAP29 were associated with NSCL/P in our family based dataset. Five single-nucleotide polymorphisms (SNPs) flanking and within ARHGAP29 were genotyped in our NSCL/P datasets consisting of simplex and multiplex families of non-Hispanic white (NHW, primarily European) and Hispanic ethnicities. Results showed strong association of three ARHGAP29 SNPs with NSCL/P in the NHW families. Two intronic SNPs (rs1541098 and rs3789688) showed strong association with NSCL/P in all NHW families (p = 0.0005 and p = 0.0002, respectively), and simplex NHW families (p = 0.003 for both SNPs). A SNP in the 3' untranslated region (rs1576593) also showed strong association with NSCL/P in all NHW families (p = 0.002), and the multiplex subset (p = 0.002). ARHGAP29 SNP haplotypes were also associated with NSCL/P. Evidence of gene-gene interaction was found between ARHGAP29 and additional cleft susceptibility genes. CONCLUSION: This study further supports ARHGAP29 as a candidate gene for humanNSCL/P in families of Caucasian descent.
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