Coamplification in human breast-tumors and physical linkage at chromosomal band 12p13, of ccnd2 and fgf6 genes

The CCND2 and FGF6 genes are both located at band p13 of human chromosome 12. The two genes are coamplified in some cases (3.6%) of breast tumors. They are physically linked within a 500 kb genomic segment. Thus, both 11q13 and 12p13 chromosomal regions host related linked cyclin and FGF genes, and can be amplified in human tumors. This strengthens the hypothesis of genome duplication involving chromosomes 11 and 12.

Oncogenesis and genome duplication maps (commentary)

Examples of activation of putative cancer genes belonging to multigene families are given. Their structure and chromosomal location helps in identifying genome duplications. Reciprocally, genome duplication maps may help in predicting the location and behaviour of putative cancer genes.

Allelic loss at chromosome 8p in human breast-cancer

Loss of heterozygosity (LOH) at loci from the short arm of chromosome 8 has been shown to occur in several types of carcinomas. The consensus deletion region has been recently mapped at 8p21-p22, distal to D8S283 and NEFL loci, and proximal to LPL and D8S265 loci. We report LOH at D8S133, a marker located in this consensus region, in a panel of breast tumor samples. LOH at this locus was observed in about 20% of the tumors.

Novel sequence tagged sites from the human 8p12-p21 chromosomal region involved in breast cancer

Seventeen sequence-tagged sites (STSs) from the human 8p12-p21 chromosomal region were identified in a subset of nonchimeric yeast artificial chromosomes (YACs). YAC ends were cloned, sequenced and a PCR primer pair was designed for each of the STSs thus generated. STSs were mapped by means of PCR on somatic cell hybrids specific for chromosome 8. These STSs will contribute to the construction of physical, high-resolution genetic and transcriptional maps necessary to clone potential tumor suppressor genes of the 8p12-p21 region involved in breast cancer.