A workflow using snakemake to analyze ion torrent based metagenomics data
First, you have to install the Miniconda Python3 distribution. See here for installation instructions.
git clone https://github.com/Kange2014/ion-meta
cd ion-meta
mkdir envs/ion-meta
conda env create -f envs/environment.yaml -p envs/ion-meta
conda config --add envs_dirs $(pwd)/envs/
conda activate envs/ion-meta
Open R, and install R package pavian and Rsamtools for reporting
> if (!require(remotes)) { install.packages("remotes") }
> remotes::install_github("fbreitwieser/pavian")
> source("https://bioconductor.org/biocLite.R")
> biocLite("Rsamtools")
If finding errors in remotes::install_github("fbreitwieser/pavian"), e.g., about stringi, pls. re-install stringi package in R cmd window and then install pavian:
> install.packages ("stringi")
> remotes::install_github("fbreitwieser/pavian")
If install Rsamtools in R 3.5 or greater, install Bioconductor and packages first by typing the following in an R command window:
> if (!requireNamespace("BiocManager", quietly = TRUE)) install.packages("BiocManager")
> BiocManager::install("Rsamtools")
If finding errors in the above process about Rhtslib, pls. install Rhtslib package manually and set CPPFLAGS and LDFLAGS in the makefiles:
wget https://bioconductor.org/packages/release/bioc/src/contrib/Rhtslib_1.16.1.tar.gz
tar xvzf Rhtslib_1.16.1.tar.gz
cd Rhtslib/src/htslib-1.7/
In this directory, change the flags in the Makefile and Makefile.Rhtslib:
*Comment the lines CPPFLAGS = and LDFLAGS =*
*Change the CFLAGS = to CFLAGS +=*
Then, re-tar it:
> tar -czvf Rhtslib_1.16.1.tar.gz ./Rhtslib/
and R CMD INSTALL as described:
> R CMD INSTALL Rhtslib_1.16.1.tar.gz
Then, in an R command window:
> BiocManager::install("Rsamtools")
Initiate and Configure the workflow according to your needs via editing the file config.yaml.
python scripts/init.py --data_fp /path/to/bam/files /path/to/my_project --single_end --format {sample}.bam
In the generated directory, a new config file and a new sample list were created (by default named config.yaml and samplelist.csv, respectively). Edit the config file in your favorite text editor, in particular for below to ensure they match your case:
taxdb: /results/luze/ion-meta/resources
deeparg_dir: /results/luze/ion-meta/resources/deeparg
centrifuge_dir: /results/luze/ion-meta/resources/classifier_db
centrifuge_base: bacteria.archaea.viral.fungi.protozoa.human
You could also edit the config.yaml directly in the config folder to match your case.
Test your configuration by performing a run via
snakemake --configfile /path/to/my_project/config.yaml -j 10 --use-conda
You can also build a docker to create, deploy, and run applications with an isolated running environment in "containers". Pls. refer to a "Get started with Docker" at docker.com for a better understanding about it and also installation.
Like above steps, you first need to download one copy of the codes from the github, then run:
docker build -f Dockerfile -t ion-meta:v2 .
Sometimes, you may find you cannot install R package Rsamtools correctly. If it shows a failure related to Rhtslib, this may be due to the conflicts between htslib from samtools and htslib from Rhtslib. We can first uninstall samtools in the docker first, then install R package Rsamtools, and finally install samtools:
docker run -it ion-meta:v2 /bin/bash
conda remove -n base samtools
R
>BiocManager::install('Rsamtools')
>q()
conda install -c bioconda samtools=1.10
exit
We need to save the changes of docker image. Use below to identify the container ID:
docker ps -a
Then save the image:
docker commit <container_id> ion-meta:v2
For docker use:
docker run -it --rm -v /Path/to/Database/:/ion-meta/resources/ -v /Path/to/Bam:/input -v /Path/to/Results:/ion-meta/example/results ion-meta:v2 /bin/bash
Then, like above step 4 and 5, run the workflow.
ion-meta uses centrifuge as its primary reads classification. So, the database indexes can be built with arbritary sequences like centrifuge. Standard choices are all of the complete bacteria, archaea, viral, fungi, and human genomes, or using the sequences that are part of the BLAST nt database.
Building index on all complete bacterial, archaea, viral, fungi, and human genomes
# first use centrifuge-download to download genomes and taxonomy information from NCBI.
$ centrifuge-download -o taxonomy taxonomy
$ cur_date=`date +%Y-%m-%d`
$ mkdir $cur_date
$ centrifuge-download -o $cur_date -P 10 -m -d "archaea,bacteria,viral,fungi,protozoa" refseq > seqid2taxid.map
$ centrifuge-download -o $cur_date -P10 -d "vertebrate_mammalian" -a "Chromosome" -t 9606 -c 'reference genome' refseq >> seqid2taxid.map
Since the downloading work will need a long time, you may hope to download the genomes using a script:
$ nohup sh resources/download_genomes.sh &
# to build the index, first concatenate all downloaded sequences into a single file, and then run centrifuge-build:
$ cat $cur_date/*/*.fna > input-sequences.fna
# build centrifuge index with 8 threads, which results in four index files named bacteria.archaea.viral.fungi.protozoa.human.*.[1234].cf index files
$ centrifuge-build -p 8 --bmax 1342177280 --conversion-table seqid2taxid.map --taxonomy-tree taxonomy/nodes.dmp --name-table taxonomy/names.dmp input-sequences.fna bacteria.archaea.viral.fungi.protozoa.human
# gzip the input-sequences.fna file
$ gzip -c input-sequences.fna > input-sequences.fna.gz
Then, move these files into resources/classifier_db:
$ mv bacteria.archaea.viral.fungi.protozoa.human* resources/classifier_db
$ mv seqid2taxid.map resources/classifier_db
$ mv input-sequences.fna.gz resources/classifier_db
If you want to get summary statistics info about the downloaded database, you could run:
$ python resources/summarize_centrifuge_db.py -h
Meanwhile, update the corresponding taxonomy databases just after the complete of database update, ensuring the consistency betweeen them. You can run following commands to download all:
$ python resources/download_taxonomy.py
$ mv taxonomy resources/
$ mv krona resources/
To update virus host annotation:
$ wget ftp://ftp.genome.jp/pub/db/virushostdb/virushostdb.tsv
$ mv virushostdb.tsv resources/
To update KEGG pathogen database:
$ python resources/download_kegg_genomeinfo.py
$ mv kegg_genomeinfo.tsv resources/
For the first time to use ion-meta, pls. run below command with just one test sample, which will help install the required deeparg and the database. Subsequent runs with --use-conda will make use of the local environments without requiring internet access. This is because deeparg has a different running environment from ion-meta.
$ snakemake --configfile /path/to/my_project/config.yaml --use-conda -j 10
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