Journal Article

Allelotype analysis of chemically induced squamous cell carcinomas in F<sub>1</sub> hybrids of two inbred mouse strains with different susceptibility to tumor progression

Mariana C.Stern1, Fernando Benavides, Eric A.Klingelberger and Claudio J.Conti2

in Carcinogenesis

Volume 21, issue 7, pages 1297-1301
Published in print July 2000 | ISSN: 0143-3334
Published online July 2000 | e-ISSN: 1460-2180 | DOI: http://dx.doi.org/10.1093/carcin/21.7.1297
Allelotype analysis of chemically induced squamous cell carcinomas in F1 hybrids of two inbred mouse strains with different susceptibility to tumor progression

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Loss of heterozygosity (LOH) at specific chromosomal loci is generally considered indirect evidence for the presence of putative suppressor genes. Allelotyping of tumors using polymorphic markers distributed throughout the entire genome allows the analysis of specific allelic losses. In the field of chemical carcinogenesis, the outbred SENCAR mouse has been commonly used to analyze the multistage nature of skin tumor development. In the study reported here we generated F1 hybrids between two inbred strains (SENCARB/Pt and SSIN/Sprd) derived from the SENCAR stock that differ in their susceptibility to tumor progression. We typed 24 7,12-dimethylbenz[a]anthracene and 12-O-tetradecanoylphorbol-13-acetate-induced squamous cell carcinomas for LOH using 56 microsatellite markers distributed among all autosomal chromosomes. The highest percentage of LOH, 78%, was found on chromosome 7, but there was no preferential loss of one particular allele, indicating that the putative suppressor genes found in this area are not involved in genetic susceptibility. High levels of LOH were also found on chromosomes 16 (39%), 6 (29%), 4 (25%), 9 (25%), 14 (22%), 10 (20%) and 19 (20%), but with no preferential loss of the alleles of one strain. The chromosomal regions with LOH on mouse chromosomes 4, 6, 7, 9, 10, 14, 16 and 19 correspond to regions in the human genome where LOH has been reported and have been suggested to harbor tumor suppressor genes.

Keywords: DMBA, 7,12-dimethylbenz[a]anthracene; LOH, loss of heterozygosity; SCC, squamous cell carcinoma; TPA, 12-O-tetradecanoylphorbol-13-acetate.

Journal Article.  4209 words.  Illustrated.

Subjects: Clinical Cytogenetics and Molecular Genetics

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