Genotyping and screening of APPswe/PS1 transgenic mouse
LUO Jin-gang1,LUO Xiao-hong2,XIAO Song-hua3,WANG Ying2,XU Ying2,DUAN Chao-hui2
(1.Dept.of Clinical Laboratory,Sun Yat-sen Memorial Hospital,Sun Yat-sen University,Guangzhou 510120, Guangdong Province,China;2.Dept.of Clinical Laboratory,Fuzhou General Hospital of Nanjing Military Command, Fuzhou 350025,Fujian Province,China;3.Dept.of Clinical Neurology,Sun Yat-sen Memorial Hospital, Sun Yat-sen University,Guangzhou 510120,Guangdong Province,China)
Abstract:
Objective To optimize breeding and genotyping methods of Tg (APPswe,PSEN1dE9) 85Dbfor further study of Alzheimer disease (AD) . Methods FI generation mice were divided into 3 mating groups (group 1, + / + d X -/-$ \ group 2, + / + $ X -1-6) group 3, +/+$X+/+d). The genome DNA of F2 generation mice was isolated and genotyping was carried out by duplex PCR and agarose gel electrophoresis. The products of duplex PCR were sequenced. Results High quality genome DNA was obtained in less than 8 h for genotyping. 27 litters of F2 generation mice were breed with a total number of 222,206 of which survived to adulthood; the survival rates of group 1, 2 and 3 were 94. 29% (99/105), 91.67% (66/72) and 91. 11% (41/45), respectively (P =0.423) . The transgenic positive results of three mating groups were accorded with Mendelian segregation. There were signivicant differences in transgenic positive rate among 3 mating groups (P =0. 028) . The transgenic positive rate in group 1 ( + / + 6 X -/-? ) was correlated with genders (CO =0. 280, P =0. 003, P <0. 05) , but not in other two groups. Products of duplex PCR verified by nucleotide sequencing were consistent as predicted. Conclusion Transgenic mating system ( + / + hemizygote X + / + hemizygote) brings out homozygotic progeny that survive till adults. The modified methods for DNA isolating and genotyping is reliable and time-saving. The best mating system for neuron culture of Tg (APPswe, PSEN1dE9) 85Dbo is + / + Hemizygote X -/ -sibling (male X female).