title: Mapping of the Es-4 locus and linear order of esterase genes (linkage group V; LGV) in the rat.
abstract: There are three different linear orders of esterase loci of linkage group V (LGV) in the rat (Rattus norvegicus). The first is Es-2-Es-3-Es-1, the second Es-3-(Es-2,Es-4)-Es-1, and the third Es-3-Es-2-Es-1-Es-4. We carried out mating experiments to define the order clearly. Linkage analyses of the four esterase loci, Es-1, Es-2, Es-3, and Es-4, were carried out using two inbred strains carrying different alleles at the four loci. Six locus combinations examined in this study were as follows: Es-1-Es-2, Es-1-Es-3, Es-1-Es-4, Es-2-Es-3, Es-2-Es-4, and Es-3-Es-4. The recombination frequencies of each combination were 6.3, 6.3, 6.3, 5.2, 1.8, and 3.4%, respectively. The first recombination between Es-2 and Es-4 was observed. We propose that the esterase loci of LGV be classified into three clusters according to distances between the loci. The linear order of the four loci is shown to be as follows: [Es-3] (cluster II)-3.4 +/- 2.4%-[Es-4-1.8 +/- 1.7%-Es-2] (cluster III)-6.3 +/- 6.1%-[Es-1] (cluster I).
authors.affiliation: Department of Genetics, Central Institute for Experimental Animals, Kawasaki, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Katoh
authors.forename: S
authors.initials: S
authors.lastname: Utsu
authors.forename: S
authors.initials: S
authors.lastname: Wakana
authors.forename: Q F
authors.initials: QF
authors.lastname: Li
mesh_terms: D000818:Animals; D002874:Chromosome Mapping; D004950:Esterases / Q000235:genetics*; D005787:Gene Frequency; D008040:Genetic Linkage; D005838:Genotype; D051381:Rats; D011919:Rats, Inbred Strains; D011995:Recombination, Genetic
chemical_list: D004950:Esterases