[Objective] The study was to analyze the phylogenesis of Anas platyrhynchos. [Method] Complete sequence of mitochondrial ND2 gene of 4 Anas platyrhynchos was determined by direct DNA sequencing based on PCR products. ...[Objective] The study was to analyze the phylogenesis of Anas platyrhynchos. [Method] Complete sequence of mitochondrial ND2 gene of 4 Anas platyrhynchos was determined by direct DNA sequencing based on PCR products. Combined with ND2 gene sequences of the Anas Linnaeus accessed in GenBank, phylogenetic tree was constructed by Neighbor-joining and maximum parsimony methods. [Result] The ND2 gene sequences of 4 Anas platyrhynchos were identical(1 041 bp in length; the nucleotide contents of A, G, T, and C were 28.91%, 13.35%, 20.75% and 36.98% respectively; A+T content approximated to that of C+G). Sequences of ND2 gene of mallard were same as spotbill duck, and had high homology with others. The phylogenetic trees indicated mallard and spotbilled duck were close in genetic relationship, both shared a haplotype; then Philippine duck, green-winged teal and northern pintail fell into branch ''A". [Conclusion] The domestic duck may be domesticated from mallard and spotbilled duck.展开更多
为进一步探究鹅卵泡颗粒细胞内源性脂肪酸合成代谢机制,利用CRISPR-Cas9技术构建靶向鹅硬脂酰辅酶A去饱和酶(stearoyl-coenzyme A desaturase,SCD)基因的慢病毒敲减质粒并进行慢病毒包装。首先设计鹅SCD基因的单链指导RNA(single-guide ...为进一步探究鹅卵泡颗粒细胞内源性脂肪酸合成代谢机制,利用CRISPR-Cas9技术构建靶向鹅硬脂酰辅酶A去饱和酶(stearoyl-coenzyme A desaturase,SCD)基因的慢病毒敲减质粒并进行慢病毒包装。首先设计鹅SCD基因的单链指导RNA(single-guide RNA,sgRNA)序列,其次体外合成并验证裂解效率,最后利用psPAX2和pMD2.G包装质粒制备psgRNA-mCherry-T2A-Puro和pLenti-Cas9-T2A-EGFP慢病毒质粒。结果表明,慢病毒质粒被成功构建,且其感染中国仓鼠卵巢(Chinese hamster ovary,CHO)细胞后筛选出能同时表达红色荧光蛋白和增强绿色荧光蛋白的强双阳性细胞群。这为后续感染鹅原代颗粒细胞并敲减其SCD基因研究奠定了基础。展开更多
基金Supported by National Key Technology R&D program(2006BAD06B06)National Infrastructure of Natural Resources for Science and Technology(2004DKA30460)~~
文摘[Objective] The study was to analyze the phylogenesis of Anas platyrhynchos. [Method] Complete sequence of mitochondrial ND2 gene of 4 Anas platyrhynchos was determined by direct DNA sequencing based on PCR products. Combined with ND2 gene sequences of the Anas Linnaeus accessed in GenBank, phylogenetic tree was constructed by Neighbor-joining and maximum parsimony methods. [Result] The ND2 gene sequences of 4 Anas platyrhynchos were identical(1 041 bp in length; the nucleotide contents of A, G, T, and C were 28.91%, 13.35%, 20.75% and 36.98% respectively; A+T content approximated to that of C+G). Sequences of ND2 gene of mallard were same as spotbill duck, and had high homology with others. The phylogenetic trees indicated mallard and spotbilled duck were close in genetic relationship, both shared a haplotype; then Philippine duck, green-winged teal and northern pintail fell into branch ''A". [Conclusion] The domestic duck may be domesticated from mallard and spotbilled duck.