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2100 Bioanalyzer Instrument

公司名称: Agilent Technologies
产品编号: G2939BA
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Low-cost and High-throughput RNA-seq Library Preparation for Illumina Sequencing from Plant Tissue
Author:
Date:
2020-10-20
[Abstract]  Transcriptome analysis can provide clues to biological processes affected in different genetic backgrounds or/and under various conditions. The price of RNA sequencing (RNA-seq) has decreased enough so that medium- to large-scale transcriptome analyses in a range of conditions are feasible. However, the price and variety of options for library preparation of RNA-seq can still be daunting to those who would like to use RNA-seq for their first time or for a single experiment. Among the criteria for selecting a library preparation protocol are the method of RNA isolation, nucleotide ... [摘要]  [摘要] 转录组分析可以为不同遗传背景或不同条件下的生物学过程提供线索。RNA测序(RNA-seq)的价格已经下降到足够低的程度,因此在各种条件下进行中大规模转录组分析是可行的。然而,对于那些希望第一次使用RNA-seq或进行单个实验的人来说,RNA-seq库制备的价格和各种选择仍然是令人望而生畏的。选择文库制备方案的标准包括RNA分离方法、核苷酸片段化以获得所需的大小范围,以及文库索引以汇集测序样本进行多路复用。在这里,我们提出了一个高质量和高通量的选择,从多聚腺苷酸mRNA制备文库用于转录组分析。高质量和高通量的方案选择都包括通过磁珠使poly-A尾部沉淀,cDNA合成,然后通过Tn5介导的“标记”同时裂解和添加适配器的步骤。该方案的所有步骤均已通过拟南芥叶片和幼苗组织的验证,并简化为协同工作,在资金和时间上成本最低,因此旨在为转录组分析提供一个初学者友好的从开始到完成的RNA序列库制备。

[背景] 通过Southern印迹、expressed sequence ...

mRNA Extraction from Gill Tissue for RNA-sequencing
Author:
Date:
2020-03-05
[Abstract]  Adaptation is thought to proceed in part through spatial and temporal changes in gene expression. Fish species such as the threespine stickleback are powerful vertebrate models to study the genetic architecture of adaptive changes in gene expression since divergent adaptation to different environments is common, they are abundant and easy to study in the wild and lab, and have well-established genetic and genomic resources. Fish gills, due to their respiratory and osmoregulatory roles, show many physiological adaptations to local water chemistry, including differences in gene expression. ... [摘要]  [摘要 ] 适应被认为是部分通过基因表达的时空变化进行的。鱼种如 三脊棘背由于对不同环境的适应性差异很普遍,因此它们是研究基因表达适应性变化的遗传结构的强大脊椎动物模型,它们在野外和实验室中丰富且易于研究,并且具有完善的遗传和基因组资源。鱼g由于其呼吸和渗透调节作用,对局部水化学表现出许多生理适应性,包括基因表达的差异。但是,从流行于软骨和骨骼的小组织样本(例如鱼g)中,使用流行的基于柱的提取方法获得高质量的RNA可能具有挑战性。在这里,我们描述了不使用纯化柱的基于珠子的mRNA提取和转录组RNA-seq协议。为了使用动物或植物组织进行各种基因表达实验,可以根据样品量轻松调整实验方案。

[背景 ] 转录组测序(RNA-seq)用于量化基因的表达水平,鉴定样品组之间基因表达水平的差异并推断基因共表达。在进化遗传学研究,RNA-SEQ可以用来作为一种方法来研究自适应发散的分子基础(例如,Rougeux 等人;,2019 Verta酒店和Jones,2019) ,鉴定候选基因底层自适应的表型(例如,费雷拉等等人,2017),并推断未知基因的功能(例如,Rawat ...

Coupling Exonuclease Digestion with Selective Chemical Labeling for Base-resolution Mapping of 5-Hydroxymethylcytosine in Genomic DNA
Author:
Date:
2018-03-05
[Abstract]  This protocol is designed to obtain base-resolution information on the level of 5-hydroxymethylcytosine (5hmC) in CpGs without the need for bisulfite modification. It relies on (i) the capture of hydroxymethylated sequences by a procedure known as ‘selective chemical labeling’ (see Szulwach et al., 2012) and (ii) the digestion of the captured DNA by exonucleases. After Illumina sequencing of the digested DNA fragments, an ad hoc bioinformatic pipeline extracts the information for further downstream analysis. [摘要]  该协议旨在获得CpGs中5-羟甲基胞嘧啶(5hmC)水平的碱基分辨率信息,而无需亚硫酸氢盐修饰。 它依赖于(i)通过称为“选择性化学标记”(参见Szulwach等人,2012)的方法捕获羟甲基化序列和(ii)通过外切核酸酶消化捕获的DNA。 在消化的DNA片段的Illumina测序之后,特设的生物信息学管道提取信息用于进一步的下游分析。

【背景】基因组DNA中胞嘧啶的甲基化可以被蛋白质读取,并且主要被翻译成基因沉默。基因组中的大多数CpG二核苷酸是甲基化的,包括位于基因调控区如增强子的那些。然而,当需要时,这些CpG可以通过Ten Eleven Translocation(TET)酶将甲基氧化并且通过碱基切除修复系统用未甲基化的胞嘧啶置换来去甲基化。 5-羟甲基胞嘧啶(5hmC)是5-甲基胞嘧啶的第一个氧化衍生物,并且在基因组中绘制该修饰的碱基提供了关于正在进行活性去甲基化的区域的信息。尽管选择性化学标记(SCL)可以非常特异地检测5hmC,但该技术的分辨率受DNA片段大小的限制,特别是当捕获的DNA中存在多个CpG时。为了提高分辨率,我们引入了使用外切核酸酶的消化步骤,所述核酸外切酶将DNA分子修剪成靠近羟甲基化的胞嘧啶(Sérandour et。,2016)。然后对测序读数进行适当的生物信息学处理,然后将羟甲基化评分赋予捕获的CpG。

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