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. 1995 Jan;56(1):167–174.

Molecular and Cellular Analysis of the DNA Repair Defect in a Patient in Xeroderma Pigmentosum Complementation Group D Who Has the Clinical Features of Xeroderma Pigmentosum and Cockayne Syndrome

B C Broughton, A F Thompson, S A Harcourt, W Vermeulen, J H J Hoeijmakers, E Botta, M Stefanini, M D King, C A Weber, J Cole, C F Arlett, A R Lehmann
PMCID: PMC1801309  PMID: 7825573

Abstract

Xeroderma pigmentosum (XP) and Cockayne syndrome (CS) are quite distinct genetic disorders that are associated with defects in excision repair of UV-induced DNA damage. A few patients have been described previously with the clinical features of both disorders. In this paper we describe an individual in this category who has unusual cellular responses to UV light. We show that his cultured fibroblasts and lymphocytes are extremely sensitive to irradiation with UV-C, despite a level of nucleotide excision repair that is 30%–40% that of normal cells. The deficiency is assigned to the XP-D complementation group, and we have identified two causative mutations in the XPD gene: a gly→arg change at amino acid 675 in the allele inherited from the patient's mother and a −1 frameshift at amino acid 669 in the allele inherited from his father. These mutations are in the C-terminal 20% of the 760-amino-acid XPD protein, in a region where we have recently identified several mutations in patients with trichothiodystrophy.

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Selected References

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