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| Increased copy number at 17q22-q24 by CGH in breast cancer is due to high-level amplification of two separate regions |
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| Author(s): Barlund M, Tirkkonen M, Forozan F, Tanner MM, Kallioniemi O, Kallioniemi A |
| Source: GENES CHROMOSOMES & CANCER Volume: 20 Issue: 4 Pages: 372-376 Published: DEC 1997 |
| Times Cited: 76 References: 22 |
| Abstract: Studies by comparative genomic hybridization (CGH) have defined a chromosomal site at 17q22-q24 that is often overrepresented in breast cancer, neuroblastoma, and several other tumor types. Due to the limited resolution and dynamic range of CGH, it remains unclear whether this gain reflects high-level amplification of small subregion(s) or low-level gain of most of the distal 17q. We used 32 physically mapped 17q probes to construct more accurate copy number profiles for 14 breast cancer cell lines by interphase fluorescence in situ hybridization (FISH). Six cell lines (43%) showed an increased copy number of the 17q22-q24 region by CGH, and seven (50%) by FISH. FISH copy number profiles had a substantially higher dynamic range than did CGH profiles. FISH revealed two independent, highly amplified regions (A and B) at 17q23, separated by about 5 Mb of non-amplified DNA, These regions were distinctly telomeric from the ERBB2 gene locus. However, region A was often co-amplified with ERBB2, whereas B was amplified in cell lines that showed no ERBB2 amplification. We conclude that distal 17q gains recently discovered in breast cancer by CGH are due to high-level amplifications of two different regions at 17q23. This chromosomal region has previously been reported to undergo allelic loss and therefore was thought to harbor a tumor suppressor gene. The present FISH data provide support for the presence, and a starting point for the positional isolation, of 17q23 genes whose upregulation by amplification may play a role in the progression of breast cancer and many other tumor types. (C) 1997 Wiley-Liss, Inc. |
| Document Type: Article |
| Language: English |
Addresses:
1. NIH, CANC GENET LAB, NATL HUMAN GENOME RES INST, BETHESDA, MD 20892 USA
2. UNIV TAMPERE, INST MED TECHNOL, CANC GENET LAB, FIN-33101 TAMPERE, FINLAND
3. TAMPERE UNIV HOSP, TAMPERE, FINLAND |
| Publisher: WILEY-LISS, DIV JOHN WILEY & SONS INC, 605 THIRD AVE, NEW YORK, NY 10158-0012 |
| Subject Category: Oncology; Genetics & Heredity |
| IDS Number: YJ557 |
| ISSN: 1045-2257 |
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