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Related Experiment Videos

NF1 microdeletion breakpoints are clustered at flanking repetitive sequences.

M O Dorschner1, V P Sybert, M Weaver

  • 1Department of Medicine, University of Washington, Medical Genetics Box 357720, Seattle, WA 98195, USA. mod@u.washington.edu

Human Molecular Genetics
|December 10, 1999
PubMed
Summary

Neurofibromatosis type 1 (NF1) microdeletions cause early onset of neurofibromas. This study identifies NF1REPs as key regions involved in these deletions, suggesting a mechanism for tumor suppressor gene loss.

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Area of Science:

  • Genetics
  • Oncology
  • Molecular Biology

Background:

  • Neurofibromatosis type 1 (NF1) is a genetic disorder characterized by tumor formation.
  • Submicroscopic deletions involving the NF1 gene can lead to an earlier onset of cutaneous neurofibromas.

Purpose of the Study:

  • To investigate the genetic mechanisms underlying NF1 microdeletions.
  • To identify the critical region responsible for potentiating neurofibromagenesis in NF1 patients.

Main Methods:

  • Construction of a large-insert DNA contig (BAC/PAC/YAC) at chromosome 17q11.2.
  • Analysis of somatic cell hybrids from NF1 microdeletion patients.
  • Breakpoint mapping within NF1REPs (NF1 Repetitive Elements).

Main Results:

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  • 14 out of 17 NF1 patients had 1.5 Mb deletions encompassing the NF1 gene and other loci.
  • Deletions were frequently mediated by homologous recombination between NF1REPs.
  • A critical region of approximately 1 Mb was narrowed down for neurofibroma potentiation.

Conclusions:

  • NF1 microdeletions are often caused by homologous recombination between NF1REPs.
  • NF1REP-mediated rearrangements represent a novel mechanism for tumor suppressor gene loss.
  • Somatic recombination involving NF1REPs may contribute to loss of heterozygosity in NF1 tumors.