Preparation method of Rag1 gene defect animal model and application thereof
An animal model, gene defect technology, applied in the field of animal genetic engineering and genetic modification, can solve problems such as recombination cannot proceed normally, T cells and B cells cannot develop and mature normally, and achieve the effect of ensuring the success rate
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Embodiment 1
[0042] Example 1: Establishment of Rag1-KO mouse model (failure case)
[0043] Rag1 gene-deficient mouse model was established by gene editing technology to destroy Exon2 of mouse Rag1 gene.
[0044] (1) Determine the knockout region
[0045] According to the selective destruction of Exon2 in the Rag1 gene domain, the designed sgRNA sequence is shown in Table 1.
[0046] Table 1 sgRNA information
[0047] sgRNA name sgRNA sequence (5'→3') S1a GTAAGGTTTCCCCTCTGAGG (SEQ No. 1) S1b CCAGTAGTTCCCAGAGAAGCCTGG (SEQ No. 2) S2a CTTGACTTCCCATCAGCATGG (SEQ No. 3) S2b AGACACTTCTGCCGCATCTGTGG (SEQ No. 4)
[0048] sgRNA transcription preparation method: use the PrimerStar Max system (Table 3), sgRNA-F, sgRNA-R as primers, and perform PCR on the correctly sequenced puc57-sgRNA plasmid (1:30 dilution) as a template, and purify the PCR product to prepare sgRNA transcription Prepare the template. Transcription of sgRNA was carried out using T7-Sho...
Embodiment 2
[0067] Example 2: Establishment of Rag1-KO mouse model
[0068] Rag1 gene-deficient mouse model was established by knocking out Exon2 of mouse Rag1 gene by gene editing technology. C57BL / 6 mouse is a relatively mature mouse strain in research at present. C57BL / 6 mouse was used as the background mouse, and the Rag1-KO mouse model was successfully obtained.
[0069] (1) Determine the knockout region
[0070] Exon2 was completely knocked out according to the selection of the Rag1 gene structural domain, and the specific knockout sequence is shown in SEQ No.7.
[0071] Mouse Rag1 gene Exon2 sequence SEQ No.7
[0072]atggctgcctccttgccgtctaccctgagcttcagttctgcacccgatgaaattcaacacccacaaatcaaattttccgagtggaaatttaagctgtttagggtgagatcctttgaaaaggcacccgaagaagcacagaaggagaaggattcctcagaggggaaaccttacctagaacagtctccagtagttccagagaagcctggtggtcagaactcaattctgactcaacgagcactgaaactccatcctaaattttcaaagaaattccatgctgatgggaagtcaagcgacaaagcagttcaccaagccaggcttagacacttctgccgcatctgtgggaatcgtttcaagagtgacgggcacagc...
Embodiment 3
[0090] Example 3: Detection data of Rag1-KO mouse model
[0091] 1. Evaluation of immune system indicators in Rag1-KO mice
[0092] The immune system of the Rag1-KO mice obtained by the establishment of the line is not perfect, which will cause the disorder of the immune system of the mice (no mature T / B cells, compensatory increase of NK cells, etc.), which is very important for confirming the effectiveness of the strain production . The mouse immune indicators (mainly T / B / NK cells) were detected by flow cytometry to determine the immune system indicators of the mice.
[0093] The flow detection method is as follows:
[0094] Materials: Peripheral blood, spleen, and liver were collected from 8-week-old C57BL / 6 background mice and Rag1-KO homozygous mice, and placed in C-tubes.
[0095] Digestion: There is 3ml of pre-cooled enzyme digestion solution (PBS containing Ca, Mg+2%CS+10mM HEPES+30ugDNase+1.75mg collagenase D) in a C-type tube, and placed in a 37°C water bath for 3...
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