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软件知识分享 | featureCounts:高效的基因组特征读段计数工具

软件知识分享 | featureCounts:高效的基因组特征读段计数工具

一、featureCounts 的开发背景

      featureCounts 是由澳大利亚 墨尔本沃尔特与伊丽莎·霍尔医学研究所(Walter and Eliza Hall Institute of Medical Research, WEHI) 的 Wei Shi(施伟) 及其生物信息学团队开发的。

      它是 Subread 软件包中的一个核心组件,主要用于高通量测序数据(如 RNA-Seq、ChIP-Seq 等)的定量分析,能够高效、准确地将测序 reads 分配到基因组特征(如基因、外显子)上。

2014 年发表于 Oxford 旗下 Bioinformatics,是 RNA-seq 基因表达定量领域引用最广泛的工具之一。

开发初衷RNA-seq 定量分析的核心步骤是将比对后的 Reads 分配到基因组特征中生成表达计数。其他工具在大样本、高深度测序场景下,普遍存在运行速度慢、内存占用高、对多线程支持不佳等问题。featureCounts 通过引入染色体分块哈希(chromosome-block hashing)和特征树搜索(feature tree search)算法,将运算效率提升一到两个数量级。

支持:单端(SE)/ 双端(PE)RNA-seq 测序数据

输入文件:已完成基因组比对的 BAM / SAM 文件

二、核心模块

      featureCounts 虽为一款命令行工具,但其功能模块设计层次分明,涵盖输入处理、特征注释过滤、计数算法、多文件联合与输出控制。

1. 输入模块(Input Processing)

BAM/SAM 文件读取:支持单个或多个 BAM 文件同时处理。

格式兼容:原生支持 .bam或.sam 格式,可以同时读取多个文件统一输出。

2. 注释模块(Annotation Engine)

GTF/GFF 特征注释:以常见的 GTF/GFF 格式注释文件定义基因组分区特征。

特征类型与属性 ID:两个参数直接决定计数对象。

#参数:-t / --fType  #指定计数特征类型(feature type),默认 exon-g / --gType  #用于分组聚合的特征属性 ID(attribute type),默认 gene_id

3. 计数算法模块(Counting Algorithm)

读段分配规则:链特异性建库支持,通过 -s 参数设定链特异性策略

#参数:    -s 0 #(默认)非链特异性-s 1 #链特异性(有义链)-s 2 #反向链特异性

单端 vs 双端策略:

单端(SE):每条 Read 视为独立计数单位双端(PE):默认每个配对 Fragment 计为 1 次(而非 2 次),通过 -p 启用,结合 -B(两端均比对)、-C(排除不一致比对)提高准确性

多比对读段处理:-M 参数启用多比对读段计数。默认仅计唯一比对(MAPQ ≥ 255 或比对次数 = 1)。启用后,每条多比对读段分配 1/n 的权重(分数计数)。

最小 MAPQ 过滤:-Q 参数设定最小比对质量阈值,默认 0,推荐 RNA-seq 设 -Q 15。

重叠读段计数方法:

-O #(允许重叠特征)默认一个 Read 只分配给一个特征,开启后一个 Read 可分配给多个重叠特征--minOverlap #最小重叠碱基数,默认 1

分数计数(Fractional counting):启用 -M 和 -O 后,featureCounts 会自动使用分数分配策略,避免多重计数冲突。

4. 多文件联合定量模块(Multi-file Summarization)

featureCounts 可同时读入多个 BAM 文件,生成联合计数矩阵。

#参数:featureCounts -a annotation.gtf -o all_counts.txt \sample1.bam sample2.bam sample3.bam sample4.bam#跨文件特征过滤:--minMQS #为每个文件设定独立的 MAPQ 阈值。

5. 输出控制与报告模块(Output & Reporting)

核心输出:文本计数矩阵文件,第一列到第二列依次为 Geneid、Chr、Start、End、Strand、Length 注释列,后续每一列代表一个样本的计数。

统计摘要输出:featureCounts 运行结束后会在 STDERR 输出详细的比对分配统计摘要,包含总读段数、成功分配读段数及比例、因不同原因未分配的读段数及比例(无特征、模糊匹配、多匹配、短片段等)。

通过 -R 参数可将每条读段的分配状态输出到单独文件,供深度排查。

三、使用示例与实战

使用案例:RNA-seq 基因表达定量

# 单端数据:按基因计算表达矩阵featureCounts -T 8 -t exon -g gene_id \  -a Homo_sapiens.GRCh38.109.gtf \  -o gene_counts.txt \  sample1.bam sample2.bam sample3.bam# 双端链特异性数据(Illumina TruSeq Stranded Total RNA)featureCounts -T 8 -t exon -g gene_id \  -p -s 2 -B -C \  -a Homo_sapiens.GRCh38.109.gtf \  -o stranded_gene_counts.txt \  sample1.bam sample2.bam

参数 

说明

-a

参考注释 GTF/GFF 文件路径 

-o

输出计数矩阵文件名

-T

线程数

-t

计数特征类型

-g

聚合用的属性 ID

-s

链特异性模式(0/1/2)

-p

双端模式

-B

双端均需比对成功

-C

排除不一致配对

-M

计入多比对读段

-O

允许跨特征重叠分配

-Q

最小 MAPQ 阈值

--minOverlap

最小重叠碱基数

-R

输出每条读段的分配状态

四、输出结果汇总

1. 计数矩阵(主输出文件)

一个标准的 .txt 表格文件,以 Tab 分隔,布局参考如下:

Geneid  Chr     Start   End     Strand  Length  sample1.bam  sample2.bamENSG00000141510  chr17  7661779 7687538 -       27921   1285          1102ENSG00000142168  chr19  45430116 45432199 +       573     432           398...

第一行包含所有样本文件名作为列名。该格式无需任何转换即可直接读入 R 的 DESeq2、edgeR、limma 包。

2. 运行统计摘要(STDERR 输出)

这些统计摘要可以直接接入 MultiQC 自动化汇总,在批量样本中快速识别偏离阈值的异常样本。

3. 读段分配日志文件(可选,-R C 参数启用)

每条读段的分配状态记录,用于排查个体读段分配失败原因。

使用经验分享:不知道文库链特异性可以先用 RSeQC 推断链类型再给 featureCounts 设置对应参数。

项目地址:

https://subread.sourceforge.net/

考文献:

Liao Y, Smyth GK and Shi W. featureCounts: an efficient general-purpose program for assigning sequence reads to genomic features.Bioinformatics, 30(7):923-30, 2014
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  1. CONNECT:[ UseTime:0.000590s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000896s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000353s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000455s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000578s ]
  8. SELECT * FROM `article` WHERE `id` = 662236 LIMIT 1 [ RunTime:0.000454s ]
  9. UPDATE `article` SET `lasttime` = 1779609381 WHERE `id` = 662236 [ RunTime:0.000756s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000212s ]
  11. SELECT * FROM `article` WHERE `id` < 662236 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000533s ]
  12. SELECT * FROM `article` WHERE `id` > 662236 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002299s ]
  13. SELECT * FROM `article` WHERE `id` < 662236 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.016801s ]
  14. SELECT * FROM `article` WHERE `id` < 662236 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007880s ]
  15. SELECT * FROM `article` WHERE `id` < 662236 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008318s ]
0.133825s