Abstract
The Gorlin syndrome, or naevoid basal-cell carcinoma syndrome (NBCS) is an autosomal dominant cancer prone disease (at risk of multiple basal cell carcinomas, and other malignant or benign proliferations). We have previously reported data from peripheral blood lymphocytes of patients with this condition, showing a significant level of spontaneous chromatid and chromosome rearrangements and an overall lengthening of the cell cycle. In this paper, we confirm this disease to be a chromosome instability syndrome from studies on fibroblasts of 5 patients. Spontaneous chromosomal rearrangements, an increased frequency of sister chromatid exchanges and a slowing of the cell cycle were found, compared to age-matched control material. There was also an increased sensitivity to aberration production by mechlorethamine in patient fibroblasts. The chromosome instability we found was not restricted to a given cell lineage, but appears to be part of the general condition of this syndrome. The recently discovered gene responsible for Gorlin syndrome, PTC (or PTCH), encodes a transmembrane protein with yet poorly known functions. However, the demonstration of Gorlin syndrome as a chromosome instability syndrome suggests that this protein has a...Continue Reading
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