Reference Genome based Exon Phylogeny Pipeline
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RGB EPP

Reference Genome based Exon Phylogeny Pipeline

License: GPL-2.0-only

Author: Guoyi Zhang

Requirements

External software

  • GNU Bash (provide cd)
  • GNU coreutils (provide cp mv mkdir mv)
  • GNU findutils (provide find)
  • fastp
  • spades.py (provided by spades)
  • diamond
  • java
  • macse (default recognized path: /usr/share/java/macse.jar)
  • GNU parallel

Internal software

  • splitfasta (default recognized path: /usr/bin/splitfasta)
  • sortdiamond (default recognized path: /usr/bin/sortdiamond)

Arguments

Details

-c	--contigs	contings type: scaffolds or contigs
-g	--genes		gene file path
-f	--functions	functions type (optional): all clean 
	  		assembly fasta map pre split merge align
-h	--help		show this information
-l	--list		list file path
-m	--memory	memory settings (optional, default 16 GB)
-r	--reference	reference genome path
-t	--threads	threads setting (optional, default 8 threads)
	--macse		Macse jarfile path
	--sortdiamond	sortdiamond file path
	--splitfasta	splitfasta file path
for example: bash RGBEPP.sh -c scaffolds -f all -l list -g genes -r reference.aa.fasta 

Directories Design

.
├── 00_raw
├── 01_fastp
├── 02_spades
├── 03_assemblied
├── 04_diamond
├── 05_pre
├── 06_split
├── 07_merge
├── 08_macse
├── genes
├── list
├── reference.aa.fasta
└── RGBEPP.sh

Each directory corresponds to each function.

00_raw should conatin all raw fastq.gz data.

Text Files

list is the text file containing all samples, if your raw data is following the style ${list_name}_R1.fastq.gz and ${list_name}_R2.fastq.gz, ${list_name} is what you should list in list file. The easy way to get it in Linux/Unix system is the following command

cd 00_raw
ls | sed "s@_R[12].fastq.gz@@g" > ../list
cd ..

genes is the text file containing all gene names from the reference fasta file. The easy way to get it in Linux/Unix system is the following command

grep '>' Reference.fasta | sed "s@>@@g" > genes

reference.aa.fasta can be replaced by another other name, but it must contain reference amino acids genome in fasta format

Process

RGBEPP.sh functions

  • Function clean: Quality control + trimming (fastp)
  • Function assembly: de novo assembly (spades)
  • Function fasta: gather all fasta files from assembly directories (RGBEPP.sh)
  • Function map: local nucleic acids alignment search against amino acids subject sequence (diamond)
  • Function pre: generate corresponding sequences based on blast-styled output (sortdiamond)
  • Function split: splitting fasta sequence to directories based on the reference genome (splitfasta)
  • Function merge: merge different taxa in the same reference exon gene to one fasta (RGBEPP.sh)
  • Function align: multiple sequence align based on Condon (macse)

Downstream process

  • concatenate sequences via SeqCombGo or catsequences or sequencematrix
  • coalescent / concatenated phylogeny

sortdiamond

Usage: sortdiamond diamond_output.m8 generated.fasta sseq,qstart,qend,bitscore/evalue,qseq(optional, default 1,6,7,11,17, start from 0) bitscore/evalue(optional, default bitscore)

Default sseq is column 2, qstart is column 8, etc.

Diamond default output format (--outfmt 6) does not contain qseq, you must custom the output format under output format 6.

splitfasta

Usage: splitfasta sample.fasta

It always creates directories in the path that you run the splitfasta, and puts split fasta into the directory.