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Genetic modifiers regulating DNA replication and double-strand break repair are associated with differences in mammary tumors in mouse models of Li-Fraumeni syndrome.
- Source :
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Oncogene [Oncogene] 2021 Aug; Vol. 40 (31), pp. 5026-5037. Date of Electronic Publication: 2021 Jun 28. - Publication Year :
- 2021
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Abstract
- Breast cancer is the most common tumor among women with inherited variants in the TP53 tumor suppressor, but onset varies widely suggesting interactions with genetic or environmental factors. Rodent models haploinsufficent for Trp53 also develop a wide variety of malignancies associated with Li-Fraumeni syndrome, but BALB/c mice are uniquely susceptible to mammary tumors and is genetically linked to the Suprmam1 locus on chromosome 7. To define mechanisms that interact with deficiencies in p53 to alter susceptibility to mammary tumors, we fine mapped the Suprmam1 locus in females from an N2 backcross of BALB/cMed and C57BL/6J mice. A major modifier was localized within a 10 cM interval on chromosome 7. The effect of the locus on DNA damage responses was examined in the parental strains and mice that are congenic for C57BL/6J alleles on the BALB/cMed background (SM1-Trp53 <superscript>+/-</superscript> ). The mammary epithelium of C57BL/6J-Trp53 <superscript>+/-</superscript> females exhibited little radiation-induced apoptosis compared to BALB/cMed-Trp53 <superscript>+/-</superscript> and SM1-Trp53 <superscript>+/-</superscript> females indicating that the Suprmam1 <superscript>B6/B6</superscript> alleles could not rescue repair of radiation-induced DNA double-strand breaks mostly relying on non-homologous end joining. In contrast, the Suprmam1 <superscript>B6/B6</superscript> alleles in SM1-Trp53 <superscript>+/-</superscript> mice were sufficient to confer the C57BL/6J-Trp53 <superscript>+/-</superscript> phenotypes in homology-directed repair and replication fork progression. The Suprmam1 <superscript>B6/B6</superscript> alleles in SM1-Trp53 <superscript>+/-</superscript> mice appear to act in trans to regulate a panel of DNA repair and replication genes which lie outside the locus.<br /> (© 2021. The Author(s), under exclusive licence to Springer Nature Limited.)
- Subjects :
- Animals
Breast Neoplasms diagnosis
Chromosome Mapping
Disease Models, Animal
Disease Susceptibility
Female
Gene Expression Regulation
Genetic Linkage
Genetic Loci
Mice
Mice, Knockout
Polymorphism, Single Nucleotide
Recombinational DNA Repair
Tumor Suppressor Protein p53 genetics
Tumor Suppressor Protein p53 metabolism
Breast Neoplasms etiology
DNA Breaks, Double-Stranded
DNA Repair
DNA Replication
Genes, Modifier
Li-Fraumeni Syndrome complications
Li-Fraumeni Syndrome genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1476-5594
- Volume :
- 40
- Issue :
- 31
- Database :
- MEDLINE
- Journal :
- Oncogene
- Publication Type :
- Academic Journal
- Accession number :
- 34183771
- Full Text :
- https://doi.org/10.1038/s41388-021-01892-5