Abstract:
:Chromosome 17 is one of the most frequently altered chromosomes in malignant breast cancer. At least four genes implicated in breast cancer reside on chromosome 17 (p53, 17p13; Her-2/neu/ERBB2, 17q12; BRCA1, 17q21; and nm23, 17q22). In addition, allelic imbalance has been described for at least five regions of chromosome 17. We have previously shown that the introduction of a normal human chromosome 17 into the breast cancer cell line MCF7 by microcell mediated chromosome transfer (MMCT) results in the in vitro growth arrest of these cells within 8 weeks, suggesting the presence of a growth suppressor on chromosome 17. Additionally, we have shown that the tumor suppressor gene p53 is not responsible for this phenotype, as it is wild type in MCF7 cells, and overexpression has no effect on either the in vitro or in vivo growth of these cells. We have further localized this growth suppressor gene to 17q24-q25 by transfer of chromosome 17 hybrids containing defined deletions. Whereas transfer of hybrids that contained an intact 17q (delta43/A9 and delta26/A9) resulted in growth arrest, two hybrids with overlapping deletions at 17q24-q25, had no effect on growth of MCF7 cells. Molecular analyses revealed that 50/70 (71%) of the resulting delta2/MCF7 or delta624/MCF7 MMCT clones retained an intact introduced chromosome 17. In contrast, only 8/34 (24%) of delta43/MCF7 revertants (deleted for 17p13.1-pter) which escaped growth arrest showed no breakage of the introduced chromosome 17. We did not observe a preferential loss of an intragenic BRCA1 marker in the MMCT hybrids, excluding BRCA1 as the gene responsible for this growth arrest phenotype. These data therefore implicate a new growth suppressor gene involved in breast cancer that is localized to chromosome 17q24-q25.
journal_name
Oncogenejournal_title
Oncogeneauthors
Plummer SJ,Adams L,Simmons JA,Casey Gdoi
10.1038/sj.onc.1201073subject
Has Abstractpub_date
1997-05-15 00:00:00pages
2339-45issue
19eissn
0950-9232issn
1476-5594journal_volume
14pub_type
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