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Distinct genetic loci control development of benign and malignant skin tumours in mice
H Nagase1, S Bryson, H Cordell
1CRC Beatson Laboratories, Department of Medical Oncology, University of Glasgow, UK.
Abstract:
Genetic susceptibility to chemically induced skin cancer in mice is controlled by multiple unlinked genetic loci. Mus spretus mice have dominant resistance genes which confer resistance to interspecific F1 hybrids with susceptible Mus musculus strains. We have mapped three major resistance loci using a combination of Mapmaker/QTL analysis and multiple regression analysis to mouse chromosomes 5 and 7. At least two independent loci on chromosome 7 exert their effects primarily during benign tumour development and have very little influence on tumour progression. On the other hand, probably a single locus on chromosome 5 affects both early and late stages of malignancy. The results indicate that benign and malignant tumours are largely under independent genetic control.
Insights
Genetic resistance to chemically induced skin cancer in mice involves multiple genes. Researchers mapped three key resistance loci on chromosomes 5 and 7, revealing independent genetic control over benign and malignant tumor development.
Area of Science:
- Genetics
- Cancer Biology
- Dermatology
Background:
- Genetic susceptibility to chemically induced skin cancer in mice is complex.
- Multiple unlinked genetic loci control this susceptibility.
- Mus spretus mice possess dominant resistance genes against susceptible Mus musculus strains.
Purpose of the Study:
- To map the genetic loci controlling resistance to chemically induced skin cancer.
- To investigate the genetic control of benign versus malignant tumor development.
Main Methods:
- Utilized Mapmaker/QTL analysis and multiple regression analysis.
- Employed interspecific F1 hybrids between Mus spretus and Mus musculus strains.
Main Results:
- Identified three major resistance loci on mouse chromosomes 5 and 7.
- Two loci on chromosome 7 primarily influence benign tumor development.
- One locus on chromosome 5 affects both benign and malignant tumor stages.
Conclusions:
- Benign and malignant tumor development in chemically induced skin cancer are largely under independent genetic control.
- Specific genetic loci on chromosomes 5 and 7 play distinct roles in cancer progression.