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pre_processing_pe's Introduction

Workflow for pre-processing raw reads

This workflow was designed to work in paired-end reads from Illumina technology. It includes three steps:

  1. Removing reads of low quality (Phred quality score < 20) or those with uncalled bases (N);

  2. Excluding duplicated reads;

  3. Trimming the adaptor sequences.

The resulting files can now be used in genome assembling, variation analysis and others.

Requirements:

  • Trim Galore! installed;
  • Cutadapt in your path;
  • Raw files on the same directory tree as pre_processing_PE.mk (for example in a folder reads/).

Usage:

make -f pre_processing r1=[read_r1.fastq] r2=[read_r2.fastq] NAME=[sample_name]

Potential problems:

The script clean_solexa merges both paired-end files in a single one, but the next steps of the workflow actually require separated files, so by just counting four lines per read, I printed each one in two output files R1 and R2 using the script separate_pe.py. Therefore the user should check if this simple separation is adequate to your data before using the pipeline and, if not, change the source files.

Contact:

As I am still inexperienced and learning about GNU Make, I am sure the workflow is still lacking, so any questions, recommendations or problems please send me an email (paulomtf a-t lge.ibi.unicamp.br).

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