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Nucleic Acids Research, 2001, Vol. 29, No. 7 1443-1452
© 2001 Oxford University Press

The human XPG gene: gene architecture, alternative splicing and single nucleotide polymorphisms

Steffen Emmert, Thomas D. Schneider1, Sikandar G. Khan and Kenneth H. Kraemer*

Basic Research Laboratory, National Cancer Institute, National Institutes of Health, Building 37 Room 3E24, Bethesda, MD 20892, USA and 1Laboratory of Experimental and Computational Biology, National Cancer Institute, Frederick, MD, USA

Defects in the XPG DNA repair endonuclease gene can result in the cancer-prone disorders xeroderma pigmentosum (XP) or the XP–Cockayne syndrome complex. While the XPG cDNA sequence was known, determination of the genomic sequence was required to understand its different functions. In cells from normal donors, we found that the genomic sequence of the human XPG gene spans 30 kb, contains 15 exons that range from 61 to 1074 bp and 14 introns that range from 250 to 5763 bp. Analysis of the splice donor and acceptor sites using an information theory-based approach revealed three splice sites with low information content, which are components of the minor (U12) spliceosome. We identified six alternatively spliced XPG mRNA isoforms in cells from normal donors and from XPG patients: partial deletion of exon 8, partial retention of intron 8, two with alternative exons (in introns 1 and 6) and two that retained complete introns (introns 3 and 9). The amount of alternatively spliced XPG mRNA isoforms varied in different tissues. Most alternative splice donor and acceptor sites had a relatively high information content, but one has the U12 spliceosome sequence. A single nucleotide polymorphism has allele frequencies of 0.74 for 3507G and 0.26 for 3507C in 91 donors. The human XPG gene contains multiple splice sites with low information content in association with multiple alternatively spliced isoforms of XPG mRNA.

* To whom correspondence should be addressed. Tel: +1 301 496 9033; Fax: +1 301 496 8419; Email: kraemerk{at}nih.gov Present address: Steffen Emmert, Department of Dermatology, Goettingen University, Goettingen, Germany


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