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Alu-mediated large deletion of the CDSN gene as a cause of peeling skin disease

Authors

  • T. Wada,

    Corresponding author
    1. Department of Pediatrics, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
    • Corresponding author: Taizo Wada, MD, PhD, Department of Pediatrics, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, 13-1 Takaramachi, 920-8641 Kanazawa, Japan.

      Tel.: +81 76 265 2313;

      fax: +81 76 262 1866;

      e-mail: taizo@staff.kanazawa-u.ac.jp

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  • Y. Matsuda,

    1. Department of Pediatrics, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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  • M. Muraoka,

    1. Department of Pediatrics, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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  • T. Toma,

    1. Department of Pediatrics, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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  • K. Takehara,

    1. Department of Dermatology, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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  • M. Fujimoto,

    1. Department of Dermatology, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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  • A. Yachie

    1. Department of Pediatrics, School of Medicine, Institute of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Japan
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  • None of the authors has any potential financial conflict of interest.

Abstract

Peeling skin disease (PSD) is an autosomal recessive skin disorder caused by mutations in CDSN and is characterized by superficial peeling of the upper epidermis. Corneodesmosin (CDSN) is a major component of corneodesmosomes that plays an important role in maintaining epidermis integrity. Herein, we report a patient with PSD caused by a novel homozygous large deletion in the 6p21.3 region encompassing the CDSN gene, which abrogates CDSN expression. Several genes including C6orf15, PSORS1C1, PSORS1C2, CCHCR1, and TCF19 were also deleted, however, the patient showed only clinical features typical of PSD. The deletion size was 59.1 kb. Analysis of the sequence surrounding the breakpoint showed that both telomeric and centromeric breakpoints existed within Alu-S sequences that were oriented in opposite directions. These results suggest an Alu-mediated recombination event as the mechanism underlying the deletion in our patient.

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