OBJECTIVES: Nonsyndromic cleft lip with or without cleft palate (NSCL/P) is a common birth defect which is strongly associated with genetic factors. Previous studies in several populations showed a significant correlation between IRF6 rs642961 polymorphism and NSCL/P. The aim of this study is to indicate the correlation of IRF6 rs642961 polymorphism and NSCL/P in Iranian NSCL/P families. MATERIAL AND METHODS: In this study, we analyzed IRF6 rs642961 genotype in 352 individuals from 102 Iranian nuclear families affected by NSCL/P using iPlex assay on a Sequenom MassARRAY platform. Hardy-Weinberg equilibrium and Mendelian error checking were performed by Haploview 4.2. Allelic association analysis was conducted with family-based association tests implemented in FBAT program v2.03. RESULTS: The family-based association analysis revealed no significant association between IRF6 rs642961 genotypes and an increased NSCL/P risk. CONCLUSIONS: In contrast to other Asian populations, our study indicates that the IRF6 rs642961 polymorphism cannot be a risk factor for NSCL/P in an Iranian population. CLINICAL RELEVANCE: Genetic factors have an important role in NSCL/P, among which interferon regulatory factor 6 (IRF6) has been reported as a risk factor for NSCL/P in several populations; however, our data indicated no significant association between IRF6 polymorphism and NSCL/P in an Iranian population.
OBJECTIVES:Nonsyndromic cleft lip with or without cleft palate (NSCL/P) is a common birth defect which is strongly associated with genetic factors. Previous studies in several populations showed a significant correlation between IRF6rs642961 polymorphism and NSCL/P. The aim of this study is to indicate the correlation of IRF6rs642961 polymorphism and NSCL/P in Iranian NSCL/P families. MATERIAL AND METHODS: In this study, we analyzed IRF6rs642961 genotype in 352 individuals from 102 Iranian nuclear families affected by NSCL/P using iPlex assay on a Sequenom MassARRAY platform. Hardy-Weinberg equilibrium and Mendelian error checking were performed by Haploview 4.2. Allelic association analysis was conducted with family-based association tests implemented in FBAT program v2.03. RESULTS: The family-based association analysis revealed no significant association between IRF6rs642961 genotypes and an increased NSCL/P risk. CONCLUSIONS: In contrast to other Asian populations, our study indicates that the IRF6rs642961 polymorphism cannot be a risk factor for NSCL/P in an Iranian population. CLINICAL RELEVANCE: Genetic factors have an important role in NSCL/P, among which interferon regulatory factor 6 (IRF6) has been reported as a risk factor for NSCL/P in several populations; however, our data indicated no significant association between IRF6 polymorphism and NSCL/P in an Iranian population.
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