In this tutorial, you will find how to download NCBI SRA Run data. Therefore, I assume that you have SRA Run IDs ready (Run ID starts from SRR*, not SRX or SRE). For how to find these IDs, please visit here.
Install SRA toolkit on your computer
To download any file from the NCBI SRA database, you need to install SRA toolkit software from NCBI SRA Toolkit. You can install this software on MS Windows, Mac OS X or Linux.
Download using Run IDs
The software is a command-line version. So, you need to start “terminal” program. In the below example, I will use Mac OS X terminal program to download SRR8434837 (a cheese microbiome sample data).
Running two programs subsequently (see below) will download two FASTQ files containing paired-end Illumina raw sequence data targeting 16S rRNA genes with Run ID SRR8434837.
| prefetch -v SRR8434837 or ./prefetch -v SRR8434837 fastq-dump –split-files SRR8434837 or ./fastq-dump –split-files SRR8434837 |
If successful, you will see two files in your directory. You have two files as it is a paired-end data (see here for more details).
SRR8434837_1.fastq & SRR8434837_2.fastq
Now you are ready for uploading these paired-end data into EzBioCloud Microbiome Taxonomic Profiling (MTP) cloud (visit here).
Last updated Sept. 6, 2019
