Common fragile sites can be damaged by exposure to a variety of carcinogens. The fragile histidine triad (FHIT) gene, including the most active human chromosomal fragile site (FRA3B) at chromosome band HSA3p14.2,1 has been proposed as a tumour suppressor gene for a variety of tumours.2 The most common response to carcinogen exposure is deletions at the FHIT locus that alter the gene structure and function. In this study we assign the FHIT gene in cattle, river buffalo, sheep and goat chromosomes by comparative fluores- cence in situ hybridization (FISH)-mapping. In addition, the assignment to BTA22 was confirmed by typing the marker across a bovine radiation hybrid (RH) panel.3
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