Journal
BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY
Volume 33, Issue -, Pages 99-105Publisher
WILEY
DOI: 10.1042/BA20000090
Keywords
FISH; immunoglobulin; interphase; metaphase; paints
Funding
- NCRR NIH HHS [P41-RR01315] Funding Source: Medline
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We have used fluorescence in situ hybridization (FISH) to localize three random Chinese-hamster ovary (CHO) cell chromosomal integration sites and determine gene copy number in their amplified cell lines, Metaphase FISH showed all three to have integrated into different chromosome positions on different chromosomes, All three Geneticin parent cell lines were found to have single integration sites by Southern-blot analysis, and these data were confirmed using both metaphase and interphase FISH. Following amplification. metaphase FISH showed that amplification in two of the cell lines occurred by duplication in the chromosome arm where the integration occurred. However, for one cell line, amplification resulted in the translocation of amplified genes from one marker chromosome to another, Interphase FISH showed an expected increase in gene copy number upon amplification with methotrexate.
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