Ancestral bias in the Hras1 gene and distal Chromosome 7 among inbred mice.
Inbred strains of mice vary in their frequency of liver tumors initiated by a mutation in the Hras1 (H-ras) proto-oncogene. We sequenced 4.5 kb of the Hras1 gene on distal Chr 7 in a diverse set of 12 commonly used laboratory inbred strains of mice and detected no sequence variation to account for strain-specific differences in Hras1 mutation prevalence. Furthermore, the Hras1 sequence is essentially monoallelic for an ancestral gene derived from the M. m. domesticus species. To determine if the monoallelism and associated low rate of polymorphism are unique to Hras1 or representative of the general chromosomal locale, we extended the sequence analysis to 12 genes in the final 8 Mb of distal Chr 7. A region of at least 2.5 Mb that encompasses several genes, including Hras1 and the H19/Igf2 loci, demonstrates virtually no sequence variation. The 12 inbred strains share one dominant haplotype derived from the M. m. domesticus allele. Chromosomal regions flanking the monoallelic segment exhibit a significantly higher rate of variation and multiple haplotypes, a majority of which are attributed to M. m. domesticus or M. m. musculus ancestry.
Drew
Jennifer C
JC
McArdle Laboratory for Cancer Research, University of Wisconsin School of Medicine and Public Health, 1400 University Avenue, Madison, Wisconsin 53706, USA.
Kastenmeier
Andrew S
AS
Drinkwater
Norman R
NR
D000483:Alleles; D000818:Animals; D002874:Chromosome Mapping; D002875:Chromosomes; D005786:Gene Expression Regulation; D006239:Haplotypes; D051379:Mice; D008815:Mice, Inbred Strains; D008957:Models, Genetic; D009154:Mutation; D010802:Phylogeny; D020641:Polymorphism, Single Nucleotide; D016283:Proto-Oncogene Proteins p21(ras) / Q000235:genetics*; D040641:Quantitative Trait Loci
D016283:Proto-Oncogene Proteins p21(ras)