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软件知识分享 | StringTie:RNA-seq 转录本组装与定量软件

软件知识分享 | StringTie:RNA-seq 转录本组装与定量软件

一、StringTie的开发背景

开发者:Mihaela Pertea、Steven Salzberg 团队,约翰·霍普金斯大学计算生物学中心(The Center for Computational Biology at Johns Hopkins University, Baltimore, MD, USA)。

发表:发表期刊 & 年份:2015 年Nature Biotechnology

定位:基于剪接读段图(spliced read graph)算法实现的一体化转录本组装 + 表达定量工具,兼顾已知转录本定量+新转录本发现。

为什么会有这个工具:传统的转录本定量工具在同工型(isoform)组装效率和准确性上存在不足,StringTie 通过 网络流算法(network flow)来优化转录本组装,速度更快、准确率更高。

适用范围:

输入:BAM/SAM 文件

适用:RNA-seq 有参转录本组装、新转录本发现、同工型定量、表达量矩阵构建。

二、核心功能

1. 转录本组装(主流程)

      利用剪接读段图(spliced read graph)构建各基因座的转录本结构,输出 GTF 文件,包含组装出的所有转录本及其外显子结构。

两种模式:

#有参考组装:-G #基于参考注释引导组装,适合已知基因优化#无参考组装:de novo #不依赖注释从头组装,适合新转录本发现

推荐:先用有参考模式确保已知转录本准确,再检测新转录本

2. 转录本定量

     计算每个转录本和基因的表达量(FPKM / TPM / coverage),定量基于 assembled read 覆盖度。

参数:

-e #(仅定量已有转录本,不进行新组装,加速处理批量样本)

3. 表达量矩阵构建(prepDE.py)

附带的 Python 脚本,从多个 StringTie 结果中提取基因/转录本的 read count 矩阵

输出两个表格:gene_count.csv 和 transcript_count.csv

4. 多样本合并(StringTie --merge)

合并多个样本的组装结果,生成一个统一的转录本集合

用于跨样本比较分析或构建参考转录组

参数:

--merge assembly_list.txt #(包含所有样本的 GTF 路径)

5. 新转录本发现

无参考模式或宽松参数下,可发现未注释的新外显子组合和转录本

新转录本用 "MSTRG" 前缀标识(MSTRG.1, MSTRG.2 …)

结合 gffcompare 评估新转录本的质量和类型

三、使用示例

使用场景示例:RNA-seq 有参转录本组装与定量

# 1. 有参考模式组装 + 定量stringtie sample.bam -o sample.gtf \    -p 8 -G annotation.gtf \    -l sample# 2. 仅定量已组装的转录本(加速)stringtie sample.bam -o sample.gtf \    -p 8 -G annotation.gtf \    -e -B# 3. 合并多样本转录本stringtie --merge -o merged.gtf \    -p 8 -G annotation.gtf \    assembly_list.txt# 4. 提取表达量矩阵prepDE.py -i sample_list.txt \    -g gene_count.csv -t transcript_count.csv
参数
说明
-o

输出 GTF 文件路径

-p

线程数

-G

参考注释 GTF/GFF 文件(用于引导组装或限制定量空间)

-l

转录本前缀标签(默认 STRG)

-e

仅定量已有转录本

-B

输出 Ballgown 输入文件

--merge

合并模式

-j

junction 覆盖度阈值(默认 1,提高可减少假阳性拼接)

-c

最小转录本覆盖度(默认 2.5)

-f

最小 isoform 比例(默认 0.01)

-m

最小转录本长度(默认 200)

四、输出结果

1.GTF 文件(主输出,sample.gtf)

包含所有组装出的转录本及其外显子坐标

GTF 第 9 列为转录本属性字段:

gene_id "STRG.1"; transcript_id "STRG.1.1"; …cov(覆盖度)、FPKM(每千碱基每百万片段数)、TPM(每百万转录本数)

可用 IGV、IGB 等基因组浏览器可视化

2.Ballgown 输入文件(-B 参数生成 5 个 .ctab 文件)

e2t.ctab #外显子-转录本对应关系e_data.ctab #外显子表达数据i_data.ctab #内含子表达数据t_data.ctab #转录本表达数据gene expression data #基因表达数据

      可直接用于 R 包 Ballgown 做差异表达分析,Ballgown与 StringTie 的关系:二者同属约翰・霍普金斯大学开发,Ballgown 专门用于处理 StringTie 的输出结果,进行转录本水平的差异表达分析

3.表达量矩阵(prepDE.py 输出)

gene_count.csv #基因水平的 raw count 矩阵(行=基因,列=样本)transcript_count.csv #转录本水平的 raw count 矩阵

4.其他统计信息(标准输出 / 日志)

组装出的转录本总数,基因座数量,外显子拼接情况,运行时间和内存使用。

项目地址:

https://github.com/gpertea/stringtie

安装方式:

# Conda(推荐)conda install -c bioconda stringtie# 源码编译git clone https://github.com/gpertea/stringtie.gitcd stringtie && make

使用经验分享:推荐下游衔接Ballgown比较友好。

参考文献:

Shumate A, Wong B, Pertea G, Pertea M Improved transcriptome assembly using a hybrid of long and short reads with StringTie, PLOS Computational Biology 18, 6 (2022), doi.org/10.1371/journal.pcbi.1009730

Kovaka S, Zimin AV, Pertea GM, Razaghi R, Salzberg SL, Pertea M Transcriptome assembly from long-read RNA-seq alignments with StringTie2, Genome Biology 20, 278 (2019), doi:10.1186/s13059-019-1910-1

Pertea M, Kim D, Pertea GM, Leek JT, Salzberg SL Transcript-level expression analysis of RNA-seq experiments with HISAT, StringTie and Ballgown, Nature Protocols 11, 1650-1667 (2016), doi:10.1038/nprot.2016.095

Pertea M, Pertea GM, Antonescu CM, Chang TC, Mendell JT & Salzberg SL StringTie enables improved reconstruction of a transcriptome from RNA-seq reads, Nature Biotechnology (2015), doi:10.1038/nbt.3122

本文部分内容由AI辅助整理编辑,仅供参考。如存在疏漏、错误或侵权内容,欢迎联系我们及时更正处理

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  1. CONNECT:[ UseTime:0.000891s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000831s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000495s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000559s ]
  8. SELECT * FROM `article` WHERE `id` = 679738 LIMIT 1 [ RunTime:0.000399s ]
  9. UPDATE `article` SET `lasttime` = 1780046228 WHERE `id` = 679738 [ RunTime:0.002515s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000249s ]
  11. SELECT * FROM `article` WHERE `id` < 679738 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000455s ]
  12. SELECT * FROM `article` WHERE `id` > 679738 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002170s ]
  13. SELECT * FROM `article` WHERE `id` < 679738 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010893s ]
  14. SELECT * FROM `article` WHERE `id` < 679738 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007596s ]
  15. SELECT * FROM `article` WHERE `id` < 679738 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007590s ]
0.211354s