Mouse Ntn1(Netrin-1) ELISA Kit

Objective To investigate the association of single-nucleotide polymorphisms (SNP) in grainyhead-like 3 (GRHL3) and to verify its possible interactions with others genes responsible for craniofacial development in the risk of non-syndromic oral cleft (NSOC). Methods Applying TaqMan allelic discrimination assays, we evaluated GRHL3 SNPs (rs10903078, rs41268753, and rs4648975) in an ancestry-structured case-control sample composed of 1,127 Brazilian participants [272 non-syndromic cleft palate only (NSCPO), 242 non-syndromic cleft lip only (NSCLO), 319 non-syndromic cleft lip and palate (NSCLP), and 294 healthy controls]. Additionally, SNP-SNP interactions of GRHL3 and previously reported variants in FAM49A, FOXE1, NTN1, and VAX1 were verified in non-syndromic cleft lip with or without cleft palate (NSCL +/- P). To eliminate false-positive associations, Bonferroni correction or 1,000 permutation method was applied. Results The multiple logistic regression analysis showed that the CC genotype of rs10903078 (p = .03) and the haplotype C-C formed by the SNPs rs10903078 and rs41268753 (p = .04) were associated with NSCLO, but the p-values did not withstand Bonferroni correction. However, SNP-SNP test revealed significant interactions between GRHL3 SNPs and FAM49A (rs7552), FOXE1 (rs3758249), VAX1 (rs7078160 and rs751231), and NTN1 (rs9891446). Conclusions Our results confirm the importance of GRHL3 and its interactions with previously NSOC-associated genes, including FAM49A, FOXE1, NTN1, and VAX1, in the pathogenesis of NSOC in the Brazilian population.

Single-nucleotide polymorphisms (SNPs) in protein-coding regions of genes which were previously reported to be associated with nonsyndromic cleft lip, with or without palate involvement (NSCL/P), were investigated. Twelve candidate loci [platelet-derived growth factor C (PDGFC), platelet-derived growth factor subunit A (PDGFA), platelet-derived growth factor receptor alpha (PDGFRA), glycine receptor alpha 2 (GLRA2), glycine receptor beta (GLRB), ATP binding cassette subfamily A member 4 (ABCA4), MAF bZIP transcription factor B (MAFB), interferon regulatory factor 6 (IRF6), CCDC26 long non-coding RNA (CCDC26), paired box 7 (PAX7), ventral anterior homeobox 1 (VAX1), and netrin 1 (NTN1)] covering 1.5 Mbp were sequenced in 136 NSCL/P patients and 54 healthy controls. Twenty-five genomic variants identified were further validated in another 400 NSCL/P and 200 controls. Two SNPs in IRF6 showed a protective effect against the development of NSCL/P (rs12405750, OR = 0.54, 95% CI: 0.41-0.69; and rs2235371, OR = 0.55, 95% CI: 0.43-0.71). The missense variant, rs2235371, alters the conserved amino acid valine to isoleucine at codon 274 (V274I). We observed that SNPs at IRF6 (rs2235371 and rs12405750) and GLRB (rs73856838 and rs72685584) show consistent interaction effects. The association between the missense SNP rs2235371 in gene IRF6 and NSCL/P suggests that this SNP may play an important role as a risk factor for NSCL/P in the Han Chinese populations. The marginal signal near 4q31 detected in previous genome-wide association studies might be caused by an interaction between the IRF6 and GLRB genes. This interaction needs to be further validated by experimentation in follow-up studies.