DNA repair characteristics and mutations in the ERCC2 DNA repair and transcription gene in a trichothiodystrophy patient

Authors

  • Kyoko Takayama,

    1. Biological and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94551-0808; Fax: 510-422-2282
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  • David M. Danks,

    1. Murdoch Institute for Research into Birth Defects and Victorian Clinical Genetics Services, Parkville 3052, Melbourne, Australia
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  • Edmund P. Salazar,

    Corresponding author
    1. Biological and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94551-0808; Fax: 510-422-2282
    • Biological and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94551-0808; Fax: 510-422-2282
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  • James E. Cleaver,

    1. Laboratory of Radiobiology and Environmental Health, University of California at San Francisco, San Francisco, California 94143-0750
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  • Christine A. Weber

    1. Biological and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, California 94551-0808; Fax: 510-422-2282
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Abstract

Patient TTD183ME is male and has typical trichothiodystrophy characteristics, including brittle hair, ichthyosis, characteristic face with receding chin and protruding ears, sun sensitivity, and mental and growth retardation. The relative amount of NER carried out by a TTD183ME fibroblast cell strain after ultraviolet (UV) exposure was ∼65% of normal as determined by a method that converts repair patches into quantifiable DNA breaks. UV survival curves show a reduction in survival only at doses greater than 4 J/m2. Nucleotide sequence analysis of the ERCC2 (XPD) DNA repair and transcription gene cDNA revealed both a Leu461-to-Val substitution and a deletion of amino acids 716–730 in one allele and an Ala725-to-Pro substitution in the other allele. The first allele has also been reported in one xeroderma pigmentosum group D patient and two other trichothiodystrophy patients, while the second allele has not been previously reported. Comparisons suggest that the mutation of Ala725 to Pro correlates with TTD with intermediate UV sensitivity. Hum Mutat 9:519–525, 1997. © 1997 Wiley-Liss, Inc.

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