Breast cancer cell lines carry cell line-specific genomic alterations that are distinct from aberrations in breast cancer tissues: Comparison of the CGH profiles between cancer cell lines and primary cancer tissues

BMC Cancer

Research Article

Takashi Hirano¹  Soichiro Saito¹  Motonao Nakao²  Tomoko Furuya²  Shigeto Kawauchi²  Katumi Tsuji²  Kenzo Ikemoto²  Kohsuke Sasaki³  Shigeru Yamamoto⁴  Masaaki Oka⁴ 

[1] Applied Gene Technology Research Group, Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology, 305-8566, Tsukuba-shi, Japan;Department of Pathology, Yamaguchi University Graduate School of Medicine, 755-8505, Ube, Japan;Department of Pathology, Yamaguchi University Graduate School of Medicine, 755-8505, Ube, Japan;Department of Surgery, Yamaguchi University Graduate School of Medicine, 755-8505, Ube, Japan;Department of Surgery, Yamaguchi University Graduate School of Medicine, 755-8505, Ube, Japan;

关键词: Bacterial Artificial Chromosome;    Breast Cancer Cell Line;    Comparative Genomic Hybridization;    Bacterial Artificial Chromosome Clone;    Genomic Alteration;   

DOI  :  10.1186/1471-2407-10-15

 received in 2009-02-07, accepted in 2010-01-14,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundCell lines are commonly used in various kinds of biomedical research in the world. However, it remains uncertain whether genomic alterations existing in primary tumor tissues are represented in cell lines and whether cell lines carry cell line-specific genomic alterations. This study was performed to answer these questions.MethodsArray-based comparative genomic hybridization (CGH) was employed with 4030 bacterial artificial chromosomes (BACs) that cover the genome at 1.0 megabase resolution to analyze DNA copy number aberrations (DCNAs) in 35 primary breast tumors and 24 breast cancer cell lines. DCNAs were compared between these two groups. A tissue microdissection technique was applied to primary tumor tissues to reduce the contamination of samples by normal tissue components.ResultsThe average number of BAC clones with DCNAs was 1832 (45.3% of spotted clones) and 971 (24.9%) for cell lines and primary tumor tissues, respectively. Gains of 1q and 8q and losses of 8p, 11q, 16q and 17p were detected in >50% of primary cancer tissues. These aberrations were also frequently detected in cell lines. In addition to these alterations, the cell lines showed recurrent genomic alterations including gains of 5p14-15, 20q11 and 20q13 and losses of 4p13-p16, 18q12, 18q21, Xq21.1 and Xq26-q28 that were barely detected in tumor tissue specimens. These are considered to be cell line-specific DCNAs. The frequency of the HER2 amplification was high in both cell lines and tumor tissues, but it was statistically different between cell lines and primary tumors (P = 0.012); 41.3 ± 29.9% for the cell lines and 15.9 ± 18.6% for the tissue specimens.ConclusionsEstablished cell lines carry cell lines-specific DCNAs together with recurrent aberrations detected in primary tumor tissues. It must therefore be emphasized that cell lines do not always represent the genotypes of parental tumor tissues.

【 授权许可】

Unknown   
© Tsuji et al; licensee BioMed Central Ltd. 2010. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.