Analysis scriptsTileSeqMut for TileSeq sequencing data
Project description
TileSeq mutation count package
This package is made to parse input sequecning files (fastq) with user provided parameter.csv file. Output of this pipeline is mutation counts for each pair of fastq files.
Dependencies
python 3.7/3.8 (tested mainly under py3.7)
R 3.4.4+
Bowtie2 Bowtie2-build
Installation
Please use conda to set up the environment before installing the package:
conda install -n <env_name>
You will also need the script csv2json.R
which can be installed via installing tileseqMave. Make sure csv2json.R
can be found in $PATH
The alpha version is available by running:
python -m pip install TileSeqMut
To update to the newest stable release:
python -m pip install TileSeqMut==0.4.201
Execution
After installation, you can run the package:
tileseq_mut -p ~/path/to/paramSheet.csv -o ~/path/to/output_folder -f ~/path/to/fastq_file_folder/ -name
name_of_the_run
Examples:
# on DC
tileseq_mut -p $HOME/dev/tilseq_mutcount/190506_param_MTHFR.csv -o $HOME/dev/tilseq_mutcount/output/ -f $HOME
/tileseq_data/WT/ -name MTHFR_test
# on BC2
tileseq_mut -p $HOME/dev/tilseq_mutcount/190506_param_MTHFR.csv -o $HOME/dev/tilseq_mutcount/output/ -f $HOME
/tileseq_data/WT/ -name MTHFR_test -env BC2
- This command will analyze fastq files in the folder:
~/tileseq_data/WT/
and make a time stamped output folder with the prefix:MTHFR_test
in$HOME/dev/tilseq_mutcount/output/
(Using all default parameters, see below)
Parameters
- Run
tileseq_mut --help
(py37) [rli@dc06 DC_jobs]$ tileseq_mut -h
usage: tileseq_mut [-h] [-f FASTQ] -o OUTPUT -p PARAM -n NAME
[--skip_alignment] [-r1 R1] [-r2 R2] [-log LOG_LEVEL]
[-env ENVIRONMENT] [-at AT] [-mt MT] [-c C] [-b BASE]
[-test] [-rc] [-override]
TileSeq mutation counts
optional arguments:
-h, --help show this help message and exit
-f FASTQ, --fastq FASTQ
Path to all fastq files you want to analyze
-o OUTPUT, --output OUTPUT
Output folder
-p PARAM, --param PARAM
csv paramter file
-n NAME, --name NAME Name for this run
--skip_alignment skip alignment for this analysis, ONLY submit jobs for
counting mutations in existing output folder
-r1 R1 r1 SAM file
-r2 R2 r2 SAM file
-log LOG_LEVEL, --log_level LOG_LEVEL
set log level: debug, info, warning, error, critical.
(default = info)
-env ENVIRONMENT, --environment ENVIRONMENT
The cluster used to run this script (default = DC)
-at AT Alignment time (default = 8h)
-mt MT Mutation call time (default = 48h)
-c C Number of cores to use for mutation counting
-b BASE, --base BASE ASCII code base
-test Turn on test mode
-rc Turn on rc mode, both direction of the reads will be
aligned to the reference. Variant calling will be
performed on all the reads that are aligned, regardless of their direction (BE
CAREFUL!)
-override, --sr_Override
Provide this argument when there is only one replicate
Start the run
-
Once the run starts, it will first submit alignment jobs to the cluster and keep tracking of all the submitted alignment jobs. Once all the jobs are finished, the pipeline will submit another batch of jobs for mutation calling.
-
if you want to skip alignment and only do mutation calls for existing sam files you can run the following command:
-
Example of skipping alignment:
tileseq_mut -p $HOME/dev/tilseq_mutcount/190506_param_MTHFR.csv -o /home/rothlab1/rli/dev/tilseq_mutcount/output
/190506_MTHFR_WT_2020-01-29-17-07-04/ --skip_alignment
Input files
/path/to/fastq/
- Full path to input fastq files
parameters.csv
- CSV file contains information for this run (please see example
here
).
This file is required to be comma-seperated and saved in csv format.
Output files
One output folder is created for each run. The output folder are named with name_time-stamp
Within each output folder, the following files and folders will be generated:
./main.log
- main logging file for alignment
./args.log
- arguments for this run
./ref/
- Reference fasta file and bowtie2 index
./env_aln_sh/
- Bash scripts for submitting the alignment jobs
./sam_files/
- Alignment output and log files for the raw fastq files
./name_time-stamped_mut_count/
- Mutation counts in each sample are saved in csv files
- `./main.log` - Main log file for mutation calling
- `./args.log` - command line arguments
- `./info.csv` - Meta information for each sample: sequencing depth, tile starts/ends and # of reads mapped outside of the targeted tile
- `./count_sample_*.csv` - Raw mutation counts for each sample. With meta data in header. Variants are represented in hgvs format
- `./env_mut/` - Bash scripts for summitting the mutation count jobs, also log files for each sample.
The count_sample_**.csv is passed to tileseqMave for further analysis
Alignment
The pipeline takes the sequence in the parameter file as reference and align the fastq files to the whole reference sequence. This is the sequence specified by user in the parameter file.
For each pair of fastq files (R1 and R2), the pipeline submits one alignment job to the cluster. In the folder env_sh
you can find all the scripts that were submitted to the cluster when you run main.py
.
Alignments were done using Bowtie2
with following parameters:
~/bowtie2 --no-head --norc --no-sq --local -x {ref} -U {r1} -S {r1_sam_file}
~/bowtie2 --no-head --nofw --no-sq --local -x {ref} -U {r2} -S {r2_sam_file}
Mutation Calls
From each pair of sam files we count mutations for each sample.
We first filter out reads that did not map to reference or reads that are outside of the tile. Then pass the rest of the reads to count_mut.py
. Please read the wiki page about how to call mutations using CIGAR string and MD:Z tag.
In order to eliminate sequencing errors. We apply a posterior probability cut-off. The posterior probability of a mutation was calculated using the Phred scores provided in SAM files.
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