Abstract
Previously, we described a family with a significantly increased predisposition for renal cell cancer co-segregating with a t(2;3)(q35;q21) chromosomal translocation. Several primary tumors of the clear cell type from different family members were analyzed at a molecular level. Loss of the derivative chromosome 3 was consistently found. In addition, different somatic Von Hippel Lindau (VHL) gene mutations were observed in most of the tumors analyzed, even within the same patient. Based on these results a multistep tumorigenesis model was proposed in which (non-disjunctional) loss of the derivative chromosome 3 represents an early event and somatic mutation of the VHL gene represents a late event related to tumor progression. More recently, however, we noted that these two anomalies were absent in at least one early-stage tumor sample that we tested. Similar results were obtained in another family with renal cell cancer and t(3;6)(q12;q15), thus suggesting that another genetic event may precede these two oncogenetic steps. We speculate that deregulation of a gene(s) located at or near the translocation breakpoint may act as such. In order to identify such genes, a detailed physical map encompassing the 3q21 breakpoint region was...Continue Reading
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