| Advances in Proximity Ligation in situ Hybridization (PLISH)
|
|
Author:
Date:
2020-11-05
[Abstract] Understanding tissues in the context of development, maintenance and disease requires determining the molecular profiles of individual cells within their native in vivo spatial context. We developed a Proximity Ligation in situ Hybridization technology (PLISH) that enables quantitative measurement of single cell gene expression in intact tissues, which we have now updated. By recording spatial information for every profiled cell, PLISH enables retrospective mapping of distinct cell classes and inference of their in vivo interactions. PLISH has high sensitivity, specificity and signal to noise ratio. It is also rapid, scalable, and does not require expertise in molecular biology so it can be easily adopted by basic and clinical researchers.
[摘要] [摘要]在发育，维持和疾病的背景下了解组织需要确定单个细胞在其天然体内空间范围内的分子谱。我们开发了一种邻近连接原位杂交技术（PLISH），该技术能够定量测量完整组织中单细胞基因的表达，现已更新。通过记录每个分析细胞的空间信息，PLISH可以回顾性绘制不同细胞类别并推断其体内 互动。PLISH具有很高的灵敏度，特异性和信噪比。它也快速，可扩展，并且不需要分子生物学方面的专门知识，因此基础和临床研究人员可以轻松地采用它。
[背景技术]我们最近开发了一种复用原位称为PLISH（邻位连接杂交技术原位杂交）（Nagendran等人，2018）。PLISH与其他现有的空间转录组学技术不同，因为它结合了高性能，快速多路复用，低成本和技术简单性（Wilbrey -Clark等人，2020年）。可以通过自动计算完整的冷冻或石蜡包埋组织中单细胞表达图谱来分析PLISH结果，它与同时进行的免疫染色兼容。
...
|
|
|
| Dual sgRNA-based Targeted Deletion of Large Genomic Regions and Isolation of Heritable Cas9-free Mutants in Arabidopsis
|
|
Author:
Date:
2020-10-20
[Abstract] CRISPR/Cas9 system directed by a gene-specific single guide RNA (sgRNA) is an effective tool for genome editing such as deletions of few bases in coding genes. However, targeted deletion of larger regions generate loss-of-function alleles that offer a straightforward starting point for functional dissections of genomic loci. We present an easy-to-use strategy including a fast cloning dual-sgRNA vector linked to efficient isolation of heritable Cas9-free genomic deletions to rapidly and cost-effectively generate a targeted heritable genome deletion. This step-by-step protocol includes gRNA design, cloning strategy and mutation detection for Arabidopsis and may be adapted for other plant species.
[摘要] [摘要] CRISPR/Cas9由基因特异性单导RNA（sgRNA）引导的系统是一种有效的基因组编辑工具，如编码基因中少部分碱基的删除。然而，大区域的靶向缺失产生功能缺失等位基因，这为基因组基因座的功能解剖提供了一个直接的起点。我们提出了一个简单易用的策略，包括一个快速克隆双sgRNA载体，有效分离可遗传的Cas9游离基因组缺失，以快速且经济有效地产生靶向遗传基因组缺失。该方法包括拟南芥的gRNA设计、克隆策略和突变检测，可适用于其他植物。
[背景] ...
|
|
|
| Whole-genome Identification of Transcriptional Start Sites by Differential RNA-seq in Bacteria
|
|
Author:
Date:
2020-09-20
[Abstract] Gene transcription in bacteria often starts some nucleotides upstream of the start codon. Identifying the specific Transcriptional Start Site (TSS) is essential for genetic manipulation, as in many cases upstream of the start codon there are sequence elements that are involved in gene expression regulation. Taken into account the classical gene structure, we are able to identify two kinds of transcriptional start site: primary and secondary. A primary transcriptional start site is located some nucleotides upstream of the translational start site, while a secondary transcriptional start site is located within the gene encoding sequence.
Here, we present a step by step protocol for genome-wide transcriptional start sites determination by differential RNA-sequencing (dRNA-seq) ...
[摘要] [摘要] 细菌中的基因转录通常起始于起始密码子上游的一些核苷酸。识别SPE cific Ť ranscriptional 小号挞小号ITE （TSS）为遗传操作必需的，因为在许多情况下，起始密码子上游有中涉及的基因表达调控序列元件。考虑到经典的基因结构，我们能够鉴定出两种转录起始位点：一级和二级。主要转录起始位点位于翻译起始位点上游的一些核苷酸上，而次要转录起始位点位于基因编码序列内。
这里，我们提出一步步协议全基因组吨ranscriptional 小号馅饼小号ITES d etermination通过差RNA测序（DRNA 使用肠道病原体-SEQ）福氏痢疾杆菌血清型菌株5A作为M90T模型。但是，该方法可以用于选择的任何其他细菌物种。第一步，使用热酚法从细菌培养物中纯化总RNA。核糖体RNA（rRNA）是使用商业试剂盒通过杂交探针特异性去除的。然后准备一个富含5'- 一磷酸依赖性核酸外切酶（TEX）处理的，富含初级转录本的RNA文库，用于与未进行TEX处理的文库进行比较，然后连接已知序列的RNA接头衔接子，从而确定具有单核苷酸精度的TSS。最后，对RNA进行处理以制备Illumina测序文库，并按购买的服务进行测序。通过内部生物信息学分析鉴定TSS。
...
|
|
|