Manual for tsRFinder Qinhu Wang and Weixing Shan∗ Northwest A&F University Version 1.0.0 February 11, 2015 Abstract The tsRFinder is a lightweight, fast and reliable tool for prediction and annotation of tRNA-derived small RNAs using next-generation sequencing data. It’s a free open source software available at https: //github.com/wangqinhu/tsRFinder.
Small RNAs, such as miRNA, siRNA, and piRNA, are key regulators of gene expression. The tRNA-derived small RNA (tsRNA) is a recently identified novel class of small RNA, no public tool has tailored for tsRNA analysis yet. We thus developed tsRFinder for tsRNA prediction and annotation with additional sequence and statistical analysis, using small RNA sequencing data and the reference genome sequences.
2
How to install
2.1
Dependency
The tsRFinder depends on a few free open source softwares, please check and install them at first: • Perl, v5.10.1 or higher, required for tsRFinder.pl execution. Always build-in in most of the UNIX-like OS. http://www.perl.org/get.html • R, v2.15.2 or higher, required for small RNA data analysis and illustration. http://www.r-project.org • bowtie, v1.0.0 or higher, required for small RNA mapping. https://github.com/BenLangmead/bowtie • tRNAscan-SE, v1.3.1 or higher, required for tRNA prediction. It’s optional if you prefer manual tRNA input. http://lowelab.ucsc.edu/tRNAscan-SE
2.2
Installation
You may clone 1 tsRFinder by typing the following in the terminal. 1
If git is not installed, download it from http://git-scm.com
Alternatively, you may download it from the following URL. Latest release of tsRFinder https://github.com/wangqinhu/tsRFinder/releases/latest
tsRFinder is maintained on GitHub and is ready-to-use, no compilation is required. However, if you take 1 - 2 minutes to improve the configuration, it may save you a lot of time for trouble shooting. Once tsRFinder is cloned or unpacked, move the entire directory to a proper place (or current working directory, such as home directory) and add the tsRFinder path to your environment settings. For example, if tsRFinder is placed in ”/the/path/of/tsRFinder”, then type the following in the terminal if you are using bash. Setup tsRFinder echo export tsR_dir="/the/path/of/tsRFinder" >> $HOME/.bashrc source ˜/.bashrc
tsRFinder is now ready for your dataset, if you want to run tsRFinder.pl as a system command, create a soft link for it: Make a soft link for tsRFinder.pl ln -s ‘pwd‘/tsRFinder/tsRFinder.pl /usr/local/bin/
3 3.1
How to use Preparing the dataset
Before running tsRFinder, you are asked to prepare/download the following two files: (1) the reference genome sequence, or the reference tRNA sequence and, (2) the small RNA reads. You are strongly recommended to use the reference genome sequence and raw small RNA sequencing data since tsRFinder is capable of preparing the reference tRNA data and clean 4
small RNA data automatically. In case you prefer to preparing tRNA and small RNA files manually, see ”demo/tRNA.fas” and ”demo/sRNA.fa.gz” or access the format description in the FAQ section.
3.2
Running the pipeline
Once tsRFinder is properly installed, you can run tsRFinder directly from terminal. A typical tsRFinder job can be easily finished on a modern MacBook (running OS X) or laptop (running Linux), typically within 10 minutes. To know how to use tsRFinder, see the following usage: Usage of tsRFinder: ./tsRFinder.pl -h tsRFinder usage: tsRFinder.pl
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