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Charcot–Marie–Tooth type 1A duplication appears to arise from recombination at repeat sequences flanking the 1.5 Mb monomer unit

Nature Genetics volume 2, pages 292–300 (1992)Cite this article

Abstract

We have constructed a 3.1 megabase (Mb) physical map of chromosome 17p11.2–p12, which contains a submicroscopic duplication in patients with Charcot–Marie–Tooth disease type 1A (CMT1A). We find that the CMT1A duplication is a tandem repeat of 1.5 Mb of DNA. A YAC contig encompassing the CMT1A duplication and spanning the endpoints was also developed. Several low copy repeats in 17p11.2–p12 were identified including the large (> 17 kb) CMT1A–REP unit which may be part of a mosaic repeat. CMT1A–REP flanks the 1.5 Mb CMT1A monomer unit on normal chromosome 17 and is present in an additional copy on the CMT1A duplicated chromosome. We propose that the de novo CMT1A duplication arises from unequal crossing over due to misalignment at these CMT1A–REP repeat sequences during meiosis.

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Author information

Authors and Affiliations

  1. Institute for Molecular Genetics, Baylor College of Medicine, Houston, Texas, 77030, USA

    Liu Pentao, Carol A. Wise, A. Craig Chinault, Pragna I. Patel & James R. Lupski

  2. Human Genome Center, Baylor College of Medicine, Houston, Texas, 77030, USA

    A. Craig Chinault, Pragna I. Patel & James R. Lupski

  3. Department of Biochemistry, Baylor College of Medicine, Houston, Texas, 77030, USA

    A. Craig Chinault

  4. Department of Pediatrics, Baylor College of Medicine, Houston, Texas, 77030, USA

    James R. Lupski

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Pentao, L., Wise, C., Chinault, A. et al. Charcot–Marie–Tooth type 1A duplication appears to arise from recombination at repeat sequences flanking the 1.5 Mb monomer unit. Nat Genet 2, 292–300 (1992). https://doi.org/10.1038/ng1292-292

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