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A recurring pattern of chromosomal aberrations in mammary gland tumors of MMTV‐ cmyc transgenic mice
Author(s) -
Weaver Zoë A.,
McCormack Stephen J.,
Liyanage Marek,
du Manoir Stan,
Coleman Allen,
Schröck Evelin,
Dickson Robert B.,
Ried Thomas
Publication year - 1999
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/(sici)1098-2264(199907)25:3<251::aid-gcc7>3.0.co;2-3
Subject(s) - biology , chromosomal translocation , karyotype , synteny , chromosome , chromosome instability , comparative genomic hybridization , cancer , ploidy , breakpoint , cancer research , mammary gland , cytogenetics , microbiology and biotechnology , genetics , breast cancer , gene
Mice carrying the MMTV‐ cmyc transgene develop mammary tumors at 9 to 12 months of age. Little is known about karyotypic changes in this model of human breast cancer. We have developed and applied molecular cytogenetic techniques to study chromosomal aberrations that occur in these tumors, namely, comparative genomic hybridization and spectral karyotyping. Cell lines from eight tumors were established and analyzed, four of which carried a heterozygous p53 mutation. All of the tumor cell lines revealed increases in ploidy and/or multiple numerical and structural chromosomal aberrations. No consistent differences were observed between cmyc / p53 +/+ and cmyc / p53 +/− tumors, suggesting that cmyc induces karyotype instability independent of p53 status. Loss of whole chromosome (Chr) 4 was detected in five of the eight tumors. Parts of Chr 4 are syntenic to human 1p31–p36, a region that is also deleted in human breast carcinomas. Four tumors carried translocations involving the distal portion of Chr 11 (syntenic to human chromosome arm 17q), including two translocations T(X;11), with cytogenetically identical breakpoints. We compare the pattern of chromosomal aberrations with human breast cancers, find similarities in several syntenic regions, and discuss the potential of an interspecies cytogenetic map of chromosomal gains and losses. Genes Chromosomes Cancer 25:251–260, 1999. Published 1999 Wiley‐Liss, Inc.