HuNoV GII.4 clinical isolate sequence and construction and application of infectious clone thereof
An infectious cloning and sequencing technology, applied in genetic engineering and biological fields, can solve the problem of no HuNoV infectious cloning, etc., and achieve the effect of simple construction method and high reliability
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Embodiment 1
[0054] Example 1: Replication and toxin-producing ability of HuNoV infectious clones
[0055] Spread eukaryotic cells A, B, and C on 10 cm cell culture dishes, transfect eukaryotic cells A, B, and C with 10 μg of HuNoV plasmid after 16 hours, and collect cells after 3 days; or spread eukaryotic cells C on 6-well plates, 16 hours Afterwards, 3 μg of HuNoV plasmid was transfected into eukaryotic cell C, and the cells were collected 4, 8, 12, 24, and 36 hours after transfection; after centrifugation at 1100 rpm for 5 minutes:
[0056] Cell pellet:
[0057] 1. Take 10 7 cells, and the total RNA in the cells was extracted with the RNA extraction kit from MN Company.
[0058] 2. Using the RNA as a template, use the HuNoV GII nucleic acid detection kit of Sun Yat-Sen University Daan Gene Co., Ltd. to detect the replication of HuNoV RNA in various eukaryotic cells by real-time quantitative PCR (such as figure 2 );
[0059] Cell supernatant:
[0060] 1. Use a 100KD ultrafiltratio...
Embodiment 2
[0070] Example 2: Infectivity of Progeny Virions Produced by HuNoV Infectious Clones
[0071] 1. After transfecting C cells with 10 μg pCMV-HuNoV plasmid for 3 days, collect the cell supernatant, centrifuge at 1100 rpm for 5 minutes, pipette the cell supernatant into clean collection tubes, aliquot 1 mL in each tube and store in a -80°C refrigerator for later use.
[0072] 2. Spread 6-well plates with C cells, add 1 mL of virus supernatant to each well after 16 hours and infect for 4 hours, wash with 2 mL of 1×PBS for 3 times, then replace with fresh medium and culture for 24 hours.
[0073] 3. Remove the cell supernatant, add 2mL 1×PBS to each well to wash 3 times, scrape off the cells with a cell scraper, transfer to a 1.5mLEP tube, centrifuge at 1100rpm for 5min, remove the supernatant, and keep the cell pellet.
[0074] 4. Use the RNA extraction kit of MN company to extract the total RNA in the cells.
[0075] 5. Using the RNA as a template, use the HuNoV GII nucleic acid...
Embodiment 3
[0076] Example 3: Infectious replication ability of progeny virions produced by HuNoV infectious clones
[0077] 1. After transfecting C cells with 10 μg pCMV-HuNoV plasmid for 3 days, collect the cell supernatant, centrifuge at 1100 rpm for 5 minutes, pipette the cell supernatant into clean collection tubes, aliquot 1 mL in each tube and store in a -80°C refrigerator for later use.
[0078] 2. Spread 35mm glass-bottomed dishes with C cells, add 1mL virus supernatant to each well after 16 hours and infect for 4 hours, wash with 2mL 1×PBS for 3 times, then replace with fresh medium and culture for 24 hours.
[0079] 3. Remove the cell supernatant, add 2mL 1×PBS to each small dish and wash 3 times.
[0080] 4. Add 1 mL of 4% paraformaldehyde to each well to fix at room temperature for 10 min.
[0081] 5. Remove paraformaldehyde, add 1mL 1×PBS to each small dish and wash once.
[0082] 6. Remove PBS, add 1mL 2% TritonX-100 to each small dish, and permeabilize at room temperatur...
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