Fine map of the Gct1 spontaneous ovarian granulosa cell tumor locus.

Document Type

Article

Publication Date

2-2013

Keywords

Alleles, Androgens, Animals, Carrier Proteins, Cell Line, Tumor, Cell Transformation, Neoplastic, Chromosome Mapping, Dehydroepiandrosterone, Disease Models, Animal, Disease Susceptibility, Female, Genetic Loci, Genotype, Granulosa Cell Tumor, Humans, Mice, Mice, Inbred Strains, Phenotype, Testosterone

JAX Source

Mamm Genome 2013 Feb; 24(1-2):63-71.

Volume

24

Issue

1-2

First Page

63

Last Page

71

ISSN

1432-1777

PMID

23179634

Abstract

The spontaneous development of juvenile-onset, ovarian granulosa cell (GC) tumors in the SWR/Bm (SWR) inbred mouse strain is a model for juvenile-type GC tumors that appear in infants and young girls. GC tumor susceptibility is supported by multiple Granulosa cell tumor (Gct) loci, but the Gct1 locus on Chr 4 derived from SWR strain background is fundamental for GC tumor development and uniquely responsive to the androgenic precursor dehydroepiandrosterone (DHEA). To resolve the location of Gct1 independently from other susceptibility loci, Gct1 was isolated in a congenic strain that replaces the distal segment of Chr 4 in SWR mice with a 47 × 10(6)-bp genomic segment from the Castaneus/Ei (CAST) strain. SWR females homozygous for the CAST donor segment were confirmed to be resistant to DHEA- and testosterone-induced GC tumorigenesis, indicating successful exchange of CAST alleles (Gct1 ( CA )) for SWR alleles (Gct1 ( SW )) at this tumor susceptibility locus. A series of nested, overlapping, congenic sublines was created to fine-map Gct1 based on GC tumor susceptibility under the influence of pubertal DHEA treatment. Twelve informative lines have resolved the Gct1 locus to a 1.31 × 10(6)-bp interval on mouse Chr 4, a region orthologous to human Chr 1p36.22. Mamm Genome 2013 Feb; 24(1-2):63-71.

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