Optimization of transfection conditions of chicken primordial germ cells

Yi Chuan. 2021 Mar 16;43(3):280-288. doi: 10.16288/j.yczz.20-212.


To improve the transfection efficiency of chicken primordial germ cells (PGCs), the present study evaluated the plasmid dosage and cell number on the efficiencies of three transfection reagents (Lipofectamine 2000, 3000 and LTX & Plus Reagent). PGCs was isolated from embryonic gonads of Huiyang bearded chicken. After 60 days of culture in vitro, the cells were transfected by using Lipofectamine transfection reagents with piggyBac vectors coding for the green fluorescence protein (GFP). PGCs were passaged in culture and fluorescent cells were screened and selected by flow cytometry at three days after transfection. At three weeks post transfection, about 2000 cells were injected into the stage 16 Hamburger and Hamilton (HH) embryos and incubated until stage 30 HH. The results showed that Lipofectamine 3000 was the best for transfection of PGCs. The highest transfection efficiency of PGCs could be achieved with a combination of 3 μg plasmid, 4 μL Lipofectamine 3000 transfection reagent and 0.5×10 4PGCs cells. Flow cytometry analysis showed a 23.4% efficiency of stable transfection of PGCs using Lipofectamine 3000 with piggyBac vector, which was improved 2 times or more over current commonly used methods. After reinjecting PGCs into recipient chicken embryos, GFP-positive cells were observed in the gonads of the recipient chicken embryo by fluorescence microscopy. The study comprehensively evaluated the factors of transfection reagents, plasmid dosage and cell number to optimize the transfection of PGCs, thereby providing a foundation for the efficient preparation of transgenic and gene-edited chickens.

为获得鸡原始生殖细胞(primordial germ cells, PGCs)的最佳转染效率,本研究比较不同质粒用量和不同细胞数在3种转染试剂(Lipofectamine 2000、3000和LTX & Plus Reagent)中PGCs的转染效率,利用荧光激活细胞分选技术(fluorescence activated cell sorting technology, FACS)辅助优化Lipofectamine 3000转染试剂,经FACS进一步分选获得带绿色荧光蛋白(GFP)的PGCs,继续培养3周后,移植回注到受体鸡胚中,移植3.5 d后分离性腺拍照观察。结果显示,转染试剂Lipofectamine 3000的转染效率最高,质粒、Lipofectamine 3000转染试剂和PGCs细胞数的配比为3 μg: 4 μL: 0.5×10 4个,转染5 h转染效率最高,达到23.4%,与现有的研究结果相比提高了2倍以上。移植回注PGCs到受体鸡胚中,荧光显微镜观察到鸡胚性腺中有GFP阳性细胞。本研究综合考虑转染试剂、质粒用量和细胞数量的影响因素以优化PGCs的转染条件,为高效制备转基因鸡及基因编辑鸡的研究奠定基础。.

Keywords: Lipofectamine; chicken; primordial germ cells; stable transfection.

MeSH terms

  • Animals
  • Animals, Genetically Modified
  • Chick Embryo
  • Chickens* / genetics
  • Germ Cells*
  • Gonads
  • Transfection