Sheep induced pluripotent stem cell and preparation method thereof
A technology of pluripotent stem cells and stem cells, applied in the field of induced pluripotent stem cells and their preparation
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Embodiment 1
[0038] Embodiment 1, Construction of lentiviral vector
[0039] 1.1. From the NCBI website (http: / / www.ncbi.nlm.nih.gov / ), query the specific expression or high expression of specific genes (Oct4, Sox2, c-Myc, Klf4, Lin28, Nanog, SV40, hTERT ), primers were designed according to the sequence of the coding region, and restriction sites were introduced. The primer sequences are shown in Table 1, wherein F represents the forward primer, and R represents the reverse primer.
[0040] Table 1 Primer sequences
[0041]
[0042] Note: The uppercase letters in the primer sequences are the restriction restriction sites introduced.
[0043] 1.2. PCR amplification
[0044] Using the total human cDNA as a template, PCR amplification was performed using the primers of each gene in Table 1, as follows:
[0045] Reaction system (25μl): 10×pfxMix 2.5μl, AccuPrime pfx enzyme 0.2μl, upstream and downstream primers (50μM) each 0.25μl, template 0.25μl, ddH 2 O 21.55 μl.
[0046] Reaction c...
Embodiment 2
[0050] Embodiment 2, cell culture
[0051] 2.1. Culture of sheep primary ear tip fibroblasts (PEF)
[0052] Take sheep ears, wash with 75% alcohol and shave, soak in PBS containing double antibodies (penicillin, streptomycin) for 15 minutes, then use PBS and serum-free medium (D-MEM) to wash the ears several times, and then put The ear was soaked in a small amount of D-MEM containing 10% FBS, and at the same time, it was cut into small pieces with sterile scissors, and moved to a culture bottle, keeping a small distance between the small pieces, and the culture bottle was turned upside down. After 6-8 hours, add D-MEM containing 10% FBS, place it upright, and then add a small amount of this medium every day. Generally, fibroblasts can be clearly observed after 3 or 4 days. Passage after about a week, use when passage The cells were washed twice with PBS, digested with 0.25% trypsin at 37°C for 5 min, and terminated with 10% FBS in D-MEM by pipetting. For the first passage,...
Embodiment 3
[0056] Embodiment 3, virus packaging
[0057] 3.1. Amplification of packaging plasmid
[0058] Eight kinds of correctly identified vectors obtained in Example 1 were transformed into competent bacteria to be amplified, and AxygenAxyPrep TM After pumping in the plasma Maxiprep Kit kit (Axygen Company), purify in an ultra-clean workbench, that is, mix with 1 / 10 volume of 3M NaAC and 2 times the volume of absolute ethanol of the plasmid after pumping, and then centrifuge at 13000rpm After 15 minutes, the supernatant was removed, rinsed with 75% ethanol, sucked off the supernatant, and dried in an ultra-clean workbench. The plasmid was dissolved in sterile deionized distilled water, and finally the concentration of the plasmid was determined using a spectrophotometer and gel electrophoresis.
[0059] 3.2. Transfection
[0060] According to Invitrogen transfection kit (ViraPower TM Lentiviral Expression Systems), using the transfection reagent Lipofectamine TM In 2000, the...
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