Fine allelotyping of Erbb2-induced mammary tumors in mice reveals multiple discontinuous candidate regions of tumor-suppressor loci

• Published in: Genes chromosomes & cancer 2006-02, Vol.45 (2), p.191-202
• Main Authors: Cool, Marc, Depault, François, Jolicoeur, Paul
• Format: Article
• Language: English
• Subjects: Alleles; Animals; Genes, erbB-2; Genes, Tumor Suppressor; Loss of Heterozygosity; Mammary Neoplasms, Experimental - genetics; Mice; Microsatellite Repeats; Mouse mammary tumor virus; Polymerase Chain Reaction; Terminology as Topic
• ISSN: 1045-2257; 1098-2264
• DOI: 10.1002/gcc.20276

Loss of heterozygosity (LOH) at human chromosome bands 1p32–36 and 10q23–26 is frequent in various human tumors, including breast cancers, and is thought to reflect the loss of tumor‐suppressor genes (TSGs). To map such genes, high‐resolution LOH analysis was performed on 93 Erbb2‐induced mammary tumors from (BALB/c × C57BL/6) F1 MMTV/Erbb2 transgenic mice. A panel of 24 microsatellite markers specific to the region of mouse chr4, homologous to human 1p31–36, and 16 markers specific to the mouse chr19 region, homologous to human 10q23–26 were used. In addition, lower‐density mapping was performed on the remaining portion of mouse chr4 [homologous to human 9p13, 9p21–24, 9q21–22, 9q31–34 (12 markers)] and chr19 [homologous to 9q21, 9p24, 11q12–13 (9 markers)]. Several distinct, discrete, and discontinuous LOH regions flanked by areas of heterozygosity were identified, 22 on chr4 and 14 on chr19. Among these, 13 were mapped in the region of homology with human 1p31–36 (between D4Mit153 and D4Mit254) and 9 in the region of homology with human 10q23–26 (between D19Mit46 and D19Mit6). Although several LOH loci span a large interval, many are relatively short (1–4 Mb), and a few span an interval of