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Neurofibromatosis type 1 (NF1) is a frequent hereditary disorder. The disease is characterized by a very high mutation rate (up to 1/10000 gametes per generation). NF1-related loci in the human genome have been implicated in the high mutation rate by hypothesizing that these carry disease-causing mutations, which can be transferred to the functional NF1 gene on chromosome arm 17q by interchromosomal gene conversion. To test this hypothesis, we want to identify and characterize the NF1-related loci in the human genome. In this study, we have localized an NF1-related locus in the most centromeric region of the long arm of chromosome 22. We demonstrate that this locus contains sequences homologous to cDNAs that include the GAP-related domain of the functional NF1 gene. However, the GAP-related domain itself is not represented in this locus. In addition, cosmids specific to this locus reveal, by in situ hybridization, NF1-related loci in the pericentromeric region of chromosome arm 14q and in chromosomal band 2q21. These cosmids will enable us to determine whether identified disease-causing mutations are present at the chromosome 22-associated NF1-related locus.

Identification and characterization of NF1 -related loci on human chromosomes 22, 14 and 2