Functional analysis of polymorphic variation within the promoter and 5' untranslated region of the neurofibromatosis type 1 (NF1) gene.
The regulatory regions of the neurofibromatosis type 1 (NF1) gene have scarcely been screened either for mutations of potential pathological importance or for functional polymorphisms. To address this question, a 987 bp sequence spanning the promoter and 5' flanking sequence of the human NF1 gene was screened for sequence variants in 570 unrelated NF1 patients and 105 controls. Five novel sequence variants were identified, comprising a 14 bp deletion at -142 within the promoter region, three single nucleotide substitutions in the 5'UTR (C + 247T, C + 261G, G + 462C), and a substitution (C + 514T) at the 5' end of the coding region that served to generate a Stop codon. The latter is likely to be of pathological significance since it is predicted to lead to the synthesis of a truncated protein. The functional significance of three of the other variants (14 bp del, C + 261G, G + 462C) was explored by luciferase reporter gene expression and electrophoretic mobility shift assays. The del14 variant demonstrated allele-specific protein binding without altered reporter gene expression and the G + 462C allele showed slightly decreased reporter gene expression.
Horan
Martin P
MP
Institute of Medical Genetics, University of Wales College of Medicine, Heath Park, Cardiff CF14 4XN, UK.
Osborn
Michael
M
Cooper
David N
DN
Upadhyaya
Meena
M
D020121:5' Untranslated Regions; D001483:Base Sequence; D017931:DNA Primers; D024202:Electrophoretic Mobility Shift Assay; D016514:Genes, Neurofibromatosis 1; D006367:HeLa Cells; D006801:Humans; D009456:Neurofibromatosis 1 / Q000235:genetics*; D011110:Polymorphism, Genetic; D011401:Promoter Regions, Genetic
D020121:5' Untranslated Regions; D017931:DNA Primers