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Updated: Aug 29, 2026
Orthotopic Transplantation of Breast Tumors as Preclinical Models for Breast Cancer
Published on: May 18, 2020
Allelotype of 28 human breast cancer cell lines and xenografts
I C Harkes1, F Elstrodt, W N M Dinjens
1Department of Medical Oncology, Josephine Nefkens Institute, Erasmus University Medical Center, PO Box 1738, 3000 DR Rotterdam, The Netherlands.
Abstract:
Heterozygous loss of relatively large chromosomal regions is a hallmark of the inactivation of tumour suppressor genes. Searching for deletions in cancer genomes therefore provides an attractive option to identify new tumour suppressor genes. Here, we have performed a genome-wide survey for regions exhibiting allelic loss in 24 commercially available breast cancer cell lines and four breast cancer xenografts, using microsatellite analysis. The assembled allelotype revealed an average fractional allelic loss of 0.34. A total of 19 arms had low allelic loss frequencies (<25%) and 17 arms had moderate allelic loss frequencies (25-50%). Five chromosomal arms were deleted in more than half of the breast cancer samples (8p, 10q, 13q, 17p, and 17q). Three of these frequently lost chromosomal arms had not been identified as such by comparative genome hybridisation, illustrating the higher sensitivity of microsatellite analysis for the detection of allelic losses. As we present allelic loss data of individual samples, our allelotype should not only aid the identification of new breast cancer genes but also provides a baseline for myriad studies involving these breast cancer cell lines.
Insights
This study identified frequently deleted chromosomal regions in breast cancer cell lines using microsatellite analysis. These findings aid in discovering new tumor suppressor genes and provide a baseline for future breast cancer research.
Area of Science:
- Genomics
- Cancer Biology
- Molecular Oncology
Background:
- Tumor suppressor genes are often inactivated by heterozygous loss of large chromosomal regions.
- Identifying these deletions in cancer genomes is a key strategy for discovering novel tumor suppressor genes.
Purpose of the Study:
- To conduct a genome-wide survey for allelic losses in breast cancer cell lines and xenografts.
- To identify frequently deleted chromosomal regions that may harbor tumor suppressor genes.
- To establish a comprehensive allelotype for breast cancer research.
Main Methods:
- Genome-wide survey using microsatellite analysis.
- Analysis of 24 breast cancer cell lines and 4 breast cancer xenografts.
- Determination of allelic loss frequencies across chromosomal arms.
Main Results:
- An average fractional allelic loss of 0.34 was observed.
- Five chromosomal arms (8p, 10q, 13q, 17p, and 17q) were deleted in over 50% of samples.
- Microsatellite analysis demonstrated higher sensitivity in detecting allelic losses compared to comparative genome hybridization for certain regions.
Conclusions:
- The generated allelotype provides valuable data for identifying new breast cancer genes.
- The study highlights the utility of microsatellite analysis for detecting allelic losses.
- This allelotype serves as a foundational resource for future breast cancer studies.
