Method and kit for down-regulating eukaryotic gene expression
A gene expression and eukaryotic technology, applied in the field of genetic engineering, can solve the problems of unstable down-regulated gene efficiency and short maintenance time of down-regulated genes, and achieve the effect of high specificity and good stability
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Embodiment 1
[0023] Down-regulation of fabp11a gene using 5'-p-ss-DNA Oligo / NgAgo system:
[0024] 1. Transform and synthesize NgAgo gene: introduce one or two nuclear localization sequences at the end of the NgAgo gene sequence, add polyA at the 3' end, add 5'-UTR sequence and promoter SP6 / T7 / T3 sequence at the 5' end . The modified NgAgo gene sequence is packaged with the pCS2+ vector: the modified NgAgo gene sequence and the pCS2+ vector are double digested to obtain the DNA sequence of the cohesive end, the DNA sequence is purified and recovered, and the DNA sequence of the cohesive end is catalyzed by ligase, purified and recovered to obtain the expression of pCS2+-NgAgo Plasmid (SEQ. ID. NO. 3). The pCS2+-NgAgo plasmid was linearized, in vitro transcribed, and recovered to obtain Argonautem RNA. For details, refer to the experimental procedure of a commercial in vitro transcription kit.
[0025] 2. According to the fabp11a genomic DNA sequence information of the ensembl database
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Embodiment 2
[0030] Down-regulation of ntl gene by 5'-p-ss-DNA Oligo / NgAgo system
[0031] Steps are the same as Example 1
[0032] 2. According to the ntl genome DNA sequence information of the ensembl database
[0033] (http: / / asia.ensembl.org / Danio_rerio / Gene / Summary?db=core; g=ENSDARG00000017299), design and synthesis of 5'-p-ss-DNA Oligo, such as 5'-p-ss-DNA Oligo ntl -f (SEQ.ID.NO.6), 5'-p-ss-DNA Oligo ntl-r (SEQ.ID.NO.7).
[0034] 3. Argonaute mRNA and 5'-p-ss-DNA Oligo ntl-f or ntl-r were co-injected into zebrafish 1-cell stage fertilized eggs. The microinjection amount of each fertilized egg was controlled in the range of 0.2-0.5ng of NgAgo mRNA and 0.06-0.15nM of 5'-p-ss-DNAOligo.
[0035] 4. When the injected embryo develops to 24-72hpf, observe its developmental shape. Use a genomic DNA extraction kit to extract genomic DNA from zebrafish embryos: place the embryos in cell lysate and incubate at 65°C for 30 minutes, at 95°C for 5 minutes, and at 16°C for 1 minute, (refer to...
Embodiment 3
[0037] Down-regulation of fabp11a gene using 5'-p-ss-DNA Oligo / NgAgo system:
[0038] 1. Transform and synthesize NgAgo gene: introduce one or two nuclear localization sequences at the end of the NgAgo gene sequence, add polyA at the 3' end, add 5'-UTR sequence and promoter SP6 / T7 / T3 sequence at the 5' end . The modified NgAgo gene sequence is packaged with the pcDNA3.1(+) vector: the modified NgAgo gene sequence and the pcDNA3.1(+) vector are double-digested to obtain the DNA sequence of the cohesive end, the DNA sequence is purified and recovered, and the ligase catalyzes the cohesive end The DNA sequence was purified and recovered to obtain the pcDNA3.1(+)-NgAgo expression plasmid (SEQ.ID.NO.8). The pcDNA3.1(+)-NgAgo plasmid was linearized, in vitro transcribed, and recovered to obtain Argonaute mRNA. For details, refer to the experimental procedure of a commercial in vitro transcription kit.
[0039] Step 2 to step 4 are the same as in Example 1.
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