Nijmegen breakage syndrome: clinical manifestation of defective response to DNA double-strand breaks
- PMID: 15279809
- DOI: 10.1016/j.dnarep.2004.03.004
Nijmegen breakage syndrome: clinical manifestation of defective response to DNA double-strand breaks
Abstract
Nijmegen breakage syndrome is a rare autosomal recessive genetic disease belonging to a group of disorders often called chromosome instability syndromes. In addition to a characteristic facial appearance and microcephaly, patients suffering from Nijmegen breakage syndrome have a range of symptoms including radiosensitivity, immunodeficiency, increased cancer risk and growth retardation. The underlying gene, NBS1, is located on human chromosome 8q21 and codes for a protein product termed nibrin, Nbs1 or p95. Over 90% of patients are homozygous for a founder mutation: a deletion of five base pairs which leads to a framehift and protein truncation. The protein nibrin/Nbs1 is suspected to be involved in the cellular response to DNA damage caused by ionising irradiation, thus accounting for the radiosensitivity of Nijmegen breakage syndrome. We review here some of the more recent findings on the NBS1 gene and discuss how they impinge on the clinical manifestation of the disease.
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