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定制文库技术咨询,请致电400-990-6627 / 18626127718(微信同号)
1. 文库构建:定制gRNA设计、引物合成与载体构建,提供1K-92K宽库容选择。
2. 文库扩增:确保99%覆盖度与均一性低于10。
3. 文库病毒:高滴度制备文库病毒颗粒,提供1-100mL规格。
4. 文库细胞:自动化生产,400+种细胞可选,文库细胞覆盖度超过95%。
5. 功能筛选:提供全面筛选方案顾问,细胞流式分选平台可选。
6. 数据分析:CRISPRSeek™算法平台深度测序与数据解析,输出丰富数据图表。
*海星生物提供现货供应,针对Human和Mouse全基因组范围的基因敲除(CRISPR KO)gRNA文库,实现全基因范围内功能基因的高通量快速筛选。
*海星生物还可以按照需求为客户设计合成靶向特定通路或者基因的gRNA订制文库。
Nature Genetics,A genome-wide CRISPR screen identifies a restricted set of HIV host dependency factors
美怀特海德研究所、拉根研究所和布罗德研究所的研究人员利用CRISPR-Cas9基因编辑技术找出三个有望用于治疗HIV感染的新靶标。
研究者利用CRISPR敲除筛选的策略,将影响HIV感染,同时又是细胞存活非必需的基因。一共找出5个基因,其中它三个在早前的利用RNA干扰(RNAi)的研究中并未被鉴定。
作者描述:我们的研究HIV感染的主要靶标,并找出在病毒对T细胞的感染中起着最为显著性作用的宿主基因。之前的研究已找出几种宿主依赖性因子,包括HIV侵入CD4阳性T细胞所需的两种蛋白:CD4分子、CCR5,唯一被认为治愈HIV感染的一个人就是接受来自携带这种CCR5突变的供者的骨髓移植。2008年的三项利用RNAi鉴定潜在的宿主依赖性因子的研究鉴定出800多种可能的靶标;但是这些结果很少存在重叠,提示着存在较高的假阳性。
原因是:RNAi抑制但不会完全阻断基因表达,这可能允许靶基因产生足够多的蛋白来允许HIV感染,而且它也能够抑制靶基因之外的其他基因表达,从而导致假阳性结果。利用CRISPR对源自HIV敏感性的CD4阳性T细胞的一种细胞系进行筛选,研究人员鉴定出5个基因:当让它们失活时,会让细胞免受HIV感染,同时不会影响细胞存活。
A pooled, genome-wide CRISPR screen for HIV HDFs. (a) Outline of the genome-wide CRISPR screen strategy. WT, wild type; KO, knockout. (b) Flow cytometry analysis (representative of five independent experiments) of cells infected with the HIV-1 strain JR-CSF and expressing GFP as a reporter of productive HIV infection. Where indicated, cells were transduced with sgCCR5 or an sgRNA that does not target protein-coding sequences
in the human genome (nontargeting control). (c) Flow cytometry analysis (representative of three independent experiments) quantifying CD4 and CCR5 expression on the surface of wild-type GXRCas9 cells and GXRCas9 cells that were transduced with the genome-wide sgRNA library and serially infected with HIV-1 strain JR-CSF. (d) Log2-transformed fold change in the abundance of the fifth most enriched sgRNA for every gene following HIV infection. See also supplementary Figure 1 and supplementary table 1. (e) Enrichment of individual sgRNAs for three candidate HDFs and two control genes. Values indicate log2-transformed fold change in abundance following HIV infection. Values for the uninfected group are from GXRCas9 cells that were transduced with the genome-wide sgRNA library and cultured for 3 weeks.
Cas9X 海星生物可以为病毒感染筛选相关的靶向基因提供:全基因组的gRNA病毒、细胞株的构建、验证细胞株的敲除等成熟的技术支撑。
Google Scholar 检索 "Haixing Biosciences"
1. Cas9X®基因编辑服务:影响因子为23.65
Wu W, Pu Y, Gao S, et al. Bacterial Metabolism-Initiated Nanocatalytic Tumor Immunotherapy[J]. Nano-Micro Letters, 2022, 14(1): 1-21.
2. Cas9X®基因编辑服务:影响因子为17.694
Bu, J., Zhang, Y., Wu, S. et al. KK-LC-1 as a therapeutic target to eliminate ALDH+ stem cells in triple negative breast cancer. Nat Commun 14, 2602 (2023).
3. Cas9X®基因编辑服务:影响因子为8.322
Li W, Ali T, Zheng C, et al. Fluoxetine regulates eEF2 activity (phosphorylation) via HDAC1 inhibitory mechanism in an LPS-induced mouse model of depression[J]. Journal of neuroinflammation, 2021, 18(1): 1-19.
4. Cas9X®基因编辑服务:影响因子为15.992
Li W, Ali T, Zheng C, et al. Anti-depressive-like behaviors of APN KO mice involve Trkb/BDNF signaling related neuroinflammatory changes[J]. Molecular Psychiatry, 2022, 27(2): 1047-1058.
5. Cas9X®基因编辑服务:影响因子为38.12
Ma B, Ju A, Zhang S, et al. Albumosomes formed by cytoplasmic pre-folding albumin maintain mitochondrial homeostasis and inhibit nonalcoholic fatty liver disease[J]. Signal Transduction and Targeted Therapy, 2023, 8(1): 229.
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