微生物研究新世代 -- 三代全长16S (Full-length 16S) 时至今日,微生物群落研究已全面进入测序分析阶段,当前研究主流处于二代扩增子与三代扩增子交接的时段。 二、PacBio | HiFi Full-length 16S analysis 分析流程 HiFi Full-length 16S nextflow 分析流程旨在通过DADA2 和QIIME2将全长 此流程基于QIIME2,因此其能做的分析,如alpha多样性及beta多样性,物种注释和可视化,HiFi Full-length 16S分析流程均能够实现 (图5)。 HiFi Full-length 16S 流程: https://github.com/PacificBiosciences/HiFi-16S-workflow 三、软件安装及测试 1. Full-length 16S rRNA gene amplicon analysis of human gut microbiota using MinION™ nanopore sequencing
2定量方法 目前我们常见的转录本定量方法有两种,full-length和tag。 2.1 full-length full-length实现整个转录本的count,而tag的只capture5'或3'端。 scRNA-seq的full-length文库构建与bulk RNA-seq相似,如SMART-seq2。 从理论上讲,full-length应该可以提供一个均匀的转录本coverage,但有时在coverage上还是有一定的偏差。 full-length一大优势就是可以检测到不同剪接体(splice variants)。
全长转录组(Full-length transcriptome)测序和分析是基于PacBio和Oxford Nanopore三代测序平台,利用其长读长的特性,建库测序时无需对RNA进行打断,如直接获得包含 FL ReadsFL , Full-length reads, 全长转录本。 toy S-read dataset# This is a toy dataset consisting of ~80k segmented reads (S-reads) from a Kinnex full-length Demultplex和 5' - 3' 引物去除后,得到含有polyA尾序列的 Full-Length reads (FL reads)。 3' polyA尾和嵌合体(concatemer)序列的去除后得到 Full-Length Non-Concatemer (FLNC) reads。
个人认为随着国内第一批PacBio Kinnex full-length RNA测序数据的下机,以及Revio测序仪的加持,PacBio全长转录组正式进入可定量的时代。 Nanopore Community Meeting 2023 回来后(2023年9月31日),PacBio发布了其全套 KINNEX 产品线,Kinnex single-cell RNA,Kinnex full-length 但是像细菌16S项目,全长的16S也只有1.5kb,或者转录本长度(单个转录本的平均长度为100bp-5kb)短于文库大小,使用标准Full-length 16S rRNA 或 Iso-Seq方案对单个环化互补 MAS-Seq文库构建原理简单介绍如下,以Kinnex full-length RNA Kit为例 (图4): 构建每个样本独立全长转录本文库(cDNA),每个样本在cDNA扩增时可以加入Barcode 根据官方Application note-Kinnex full-length RNA kit for isoform sequencing文件中提供的饱和度曲线的数据显示(图6),单个转录组数据达到10M
论文 MiDAS 4: A global catalogue of full-length 16S rRNA gene sequences and taxonomy for studies of bacterial
我们还开发了一个名为 FLAIR(Full-Length Alternative Isoform Analysis of RNA)的计算工具,用于从长读RNA测序数据中产生可靠可信的转录本异构体(isoform FLAIRBrooksLabUCSC/flairFLAIR(Full-Length Alternative Isoform analysis of RNA)用于长读长序列的比对校正、异构体判别和可变剪切分析
2020年7月中山大学肖传乐老师发表题为“HIT-scISOseq: High-throughput and High-accuracy Single-cell full-length Isoform HIT-scISOseq: High-throughput and High-accuracy Single-cell Full-length Isoform Sequencing for Corneal
论文 MiDAS 4: A global catalogue of full-length 16S rRNA gene sequences and taxonomy for studies of bacterial
目前总共有36个数据集:31个来自于full-length protocols同时5个是3’-end sequencing(UMI) protocol。 分析方法/Methods 在这篇文章中,共选择了七个数据集(six full-length and one UMI data)以及两个额外的UMI count数据对如下的差异分析方法进行评估。 ? 对于full-length数据集而言,在没有做prefiltering (prefiltering为过度掉低表达基因)的情况下,SeuratBimod检测到了最多存在显著表达差异的基因,而经过prefiltering 从UMI数据集看,monocle使用TPM数据反而效果不佳,当在full-length数据中,TPM数据的效果比read count要更好,特别是筛选一些低表达基因以后,相比于其他方法, voom-limma
来自加利福尼亚大学圣克鲁斯分校(University of California,Santa Cruz)的Angela Brooks团队(图1)开发的全长可变转录本(isoform)分析工具FLAIR (Full-Length Alternative Isoform analysis of RNA),于2020年03月18号发表在《Nature Communications》杂志上,题目为 Full-length transcript --stringent Specify if all supporting reads need to be full-length (80% coverage --promoters Promoter regions bed file to identify full-length reads. #启动子区域的bed文件以鉴定全长序列。 --3prime_regions TES regions bed file to identify full-length reads. #转录本终止区域的bed文件以鉴定全长序列。
论文 MiDAS 4: A global catalogue of full-length 16S rRNA gene sequences and taxonomy for studies of bacterial
主要有两种RNA序列(same as reads or tags)的获取方式:3’-end sequencing(应用于10X Genomics, CEL-seq2, Drop-seq, inDrops)和 Full-length · Full-length sequencing: o 适合可变剪切差异表达(isoform-level differences)和等位基因差异表达(allele-specific differences
图一A 本篇论文中图一A中提到 Phylogenetic tree of coronaviruses based on full-length genome sequences.
Smart-seq于2012年开发,一年后针对Smart-seq的改进版Smart-seq2《Full-length RNA-seq from single cells using Smart-seq2
Reconstruction of Full-Length Circular RNAs Enables Isoform-Level Quantification. IsoCirc Catalogs Full-Length Circular RNA Isoforms in Human Transcriptomes.
论文 MiDAS 4: A global catalogue of full-length 16S rRNA gene sequences and taxonomy for studies of bacterial
Full-length single-cell RNA-seq applied to a viral human cancer: applications to HPV expression and splicing
Microbiota profiling with long amplicons using Nanopore sequencing: full-length 16S rRNA gene and whole
传送门 Structural basis for the recognition of SARS-CoV-2 by full-length human ACE2 作者:Renhong Yan, Yuanyuan
comprehensive ecosystem-specific reference databases with species-level resolution by high-throughput full-length 使用方法 $ bash autotax.bash -h Pipeline for extracting Full-length 16S rRNA Amplicon Sequence Variants (