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Mouse-human somatic cell hybrids: loss of mouse and human chromosomes
Abstract:
Testicular germ cell tumors are unusual because they can be cured in over 80% of patients with combination chemotherapy. In order to identify chromosomes carrying genes controlling drug sensitivity, fusions were made between a mouse embryonal carcinoma (EC) cell line, F9, and a human bladder cancer cell line, MGH-UI. In contrast to some previous reports, interspecies hybrids of mouse EC cells with human cells were easy to produce. Six independent hybrids were cloned and grown for 10 further passages and karyotyped. Surprisingly, all the independent hybrids retained approximately 80% of the 40 mouse chromosomes and approximately 80% of the 83 human chromosomes. Despite the positive selection for mouse chromosomes and the absence of selection for human chromosomes, it appears that some of both sets of chromosomes are essential for these hybrids.
Insights
Researchers created hybrid cells from mouse and human cancer cells to find genes for drug sensitivity in testicular germ cell tumors. Surprisingly, these hybrid cells retained most chromosomes from both species, suggesting shared essential genes.
Area of Science:
- Cancer Biology
- Genetics
- Cell Biology
Background:
- Testicular germ cell tumors (GCTs) exhibit high cure rates (>80%) with combination chemotherapy.
- Identifying genes that confer drug sensitivity is crucial for further treatment optimization.
Purpose of the Study:
- To identify chromosomes harboring genes that control drug sensitivity in GCTs.
- To generate and characterize interspecies hybrid cell lines between mouse embryonal carcinoma (EC) cells and human bladder cancer cells.
Main Methods:
- Fusion of mouse EC cell line (F9) with human bladder cancer cell line (MGH-UI) to create interspecies hybrids.
- Cloning and culturing six independent hybrid cell lines.
- Karyotyping to analyze chromosome retention in the hybrid cell lines.
Main Results:
- Interspecies hybrid cell production was successful and easier than previously reported.
- All six independent hybrids retained approximately 80% of mouse chromosomes and 80% of human chromosomes.
- Both mouse and human chromosomes appear essential for the hybrid cells' viability.
Conclusions:
- Hybrid cell lines retain a significant proportion of chromosomes from both parent species.
- This suggests that certain chromosomes from both mouse and human genomes are critical for the survival of these hybrids.
- These findings lay the groundwork for mapping genes associated with drug sensitivity in GCTs.