The neurofibroma in Vonrecklinghausen neurofibromatosis has a unicellular origin

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dc.contributor.author Skuse, Gary en_US
dc.contributor.author Kosciolek, Barbara en_US
dc.contributor.author Rowley, Peter en_US
dc.date.accessioned 2006-08-29T13:59:26Z en_US
dc.date.available 2006-08-29T13:59:26Z en_US
dc.date.issued 1991-09 en_US
dc.identifier.citation American Journal of Human Genetics 49N3 (1991) 600-607 en_US
dc.identifier.issn 0002-9297 en_US
dc.identifier.uri http://hdl.handle.net/1850/2548 en_US
dc.description.abstract Von Recklinghausen neurofibromatosis (NF1) is the most common hereditary syndrome predisposing to neoplasia. NF1 is an autosomal dominant disease caused by a single gene which maps to chromosome 17q11.2. The most common symptomatic manifestation of NF1 is the benign neurofibroma. Our previous studies of tumors in NF1, studies which detected a loss of heterozygosity for DNA markers from the NF1 region of chromosome 17 in malignant tumors, did not detect a loss in neurofibromas. We report here that a more extensive study, including the analysis of neurofibromas from 19 unrelated NF1 patients by using seven probes, failed to detect a single instance of loss of heterozygosity. This finding suggests that neurofibromas are either polyclonal or monoclonal in origin but arise by a mechanism different from that of NF1 malignancies. In order to investigate the first possibility, we analyzed neurofibromas from female NF1 patients by using an X chromosome-specific probe, from the phosphoglycerokinase (PGK) gene, which detects an RFLP. The detected alleles carry additional recognition sites for the methylation-sensitive enzyme HpaII, so that the allele derived from the active X chromosome is digested by HpaII while the one from the hypermethylated, inactive X chromosome is not. We analyzed neurofibromas from 30 unrelated females with NF1. Eight patients were heterozygous for the PGK RFLP. By this assay, neurofibromas from all eight appeared monoclonal in origin. These results suggest that benign neurofibromas in NF1 arise by a mechanism that is different from that of malignant tumors. This mechanism may involve (a) an NF1 gene mutation that, by our analysis, is not detectable as a loss of heterozygosity or (b) a gene or genes other than the NF1 gene. en_US
dc.format.extent 40288 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher University of Chicago Press: American Journal of Human Genetics en_US
dc.subject Heterozygosity en_US
dc.subject Neurofibromatosis en_US
dc.subject X chromosome en_US
dc.title The neurofibroma in Vonrecklinghausen neurofibromatosis has a unicellular origin en_US
dc.type Article en_US

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