Genetic differences in recombination frequency in the pig (Sus scrofa).
A comparison has been performed on 3 recently published linkage maps of the pig, hereafter designated as the American (A), European (E), and Swedish (S) maps. The cumulated distances between common markers in these 3 maps were in the ratio 1.00 (A):0.88 (E):0.77 (S), in keeping with the ratio of the percentages of domestic genome in the reference families used to build the corresponding maps, i.e., 1.00 (A):0.81 (E):0.50 (S). From further recombination frequencies reported in wild boars (in the S report), the wild pig genome length (in centimorgans) is expected to represent 66% of the domestic pig genome length. These observations tend to confirm a general result of Burt and Bell (Nature (London), 326: 803-805 (1987)), showing higher chiasma frequencies in domestic mammalian species compared with wild species. Consequences for mapping studies are discussed.
Station de Génétique Quantitative et Appliquée, Institut National de la Recherche Agronomique, Jouy-en-Josas, France.
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D000818:Animals; D005260:Female; D008040:Genetic Linkage; D008297:Male; D011995:Recombination, Genetic; D013552:Swine / Q000235:genetics*