Correction by the ercc2 gene of UV sensitivity and repair deficiency phenotype in a subset of trichothiodystrophy cells

Maura Mezzina*, Eric Eveno, Odile Chevallier-lagente, Annie Benoit, Madeleine Carreau, Wim Vermeulen, Jan H.J. Hoeijmakers, Miria Stefanini, Alan R. Lehmann, Christine A. Weber, Alain Sarasin

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Trichothiodystrophy (TTD) is a rare genetic disease with heterogeneous clinical features associated with specific deficiencies in nucleotide excision repair. Patients have brittle hair due to a reduced content of cysteine-rich matrix proteins. About 50% of the cases reported in the literature are photosensitive. In these patients an altered cellular response to UV, due to a specific deficiency in nucleotide excision repair, has been observed. The majority of repairdefective TTD patients have been assigned by complementation analysis to group D of xeroderma pigmentosum (XP). Recently, the human excision repair gene ERCC2 has been shown to correct the UV sensitivity of XP-D fibroblasts. In this work we describe the effect of ERCC2 on the DNA repair deficient phenotype of XP-D and on two repair-defective TTD cell strains (TTD1VI and TTD2VI) assigned by complementation analysis to group D of XP. ERCC2 cDNA, cloned into a mammalian expression vector, was introduced into TTD and XP fibroblasts via DNA-mediated transfection or microneedle injection. UV sensitivity and cellular DNA repair properties, including unscheduled DNA synthesis and reactivation of a UVirradiated plasmid containing the chloramphenicol acetyltransferase reporter gene (pRSVCat), were corrected to wild-type levels in both TTD and XP-D cells. These data show that a functional ERCC2 gene is sufficient to reestablish a wild-type DNA repair phenotype in TTD1VI and TTD2VI cells, confirming the genetic relationship between TTD and XP-D. Furthermore, our findings suggest that mutations at the ERCC2 locus are responsible for causing a similar phenotype in TTD and XP-D cells in response to UV irradiation, but produce quite different clinical symptorns.

Original languageEnglish
Pages (from-to)1493-1498
Number of pages6
JournalCarcinogenesis
Volume15
Issue number8
DOIs
Publication statusPublished - Aug 1994

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