Gene mapping of a new coat mutation in mouse

Abstract

Gene mapping of a mouse coat mutation has been investigated. First, 100 10-bp random primers were used to amplify DNA, but the mutation could not be located by this method because there were no correlation between the amplified products and coat phenotypes. Second, by usingIdh1, Car2, Mup1, Pgb1, Hbb, Es10, Es1, Mod1, Gdc1, Ce2, Es3 as genetic markers, linkage test crosses (two-point test) consisting of intercrossing uncovered BALB/c mice (homozygotes) to CBA/N and C57BV6 mice with normal hair and backcrossing the heterozygotes of the F1 to the uncovered BALB/c mice were made. It was soon evident that the mutation was linked toEs3 on chromosome 11. Furthermore, three-point test was made by usingEs3 and D11Mit8 (a microsatellite DNA) as genetic markers. The result showed that the mutation was linked toEs3 with the percentage recombination of (7.89 ± 2.19)%, and linked to Dl1Mit8 with the percentage recombination of (26.30± 3.57)%. The percentage recombination betweenEs3 and D11Mit8 was (32.90±3.81)%. The mutation was named Uncovered, with the symbolUncv. According to the recombinations, the loci order was D11Mit8-26.30±3.57-Uncv- 7.89 -2.19-Es3. From the location on the chromosome, it was concluded that the mutation was a new mutation which affected the skin and hair structure of mouse. TheUncv has entered MGD (Mouse Genome Database).