gene2phylo

gene2phylo is a snakemake pipeline for batch phylogenetic analysis of a given set of input genes.

Contents

• Setup
• Example data
• Input
• Output
• Running your own data
• Getting help
• Citations

Setup

The pipeline is written in Snakemake and uses conda to install the necessary tools.

It is strongly recommended to install conda using Mambaforge. See details here https://snakemake.readthedocs.io/en/stable/getting_started/installation.html

Once conda is installed, you can pull the github repo and set up the base conda environment.

# get github repo
git clone https://github.com/o-william-white/gene2phylo

# change dir
cd gene2phylo

# setup conda env
conda env create -n snakemake -f workflow/envs/conda_env.yaml

Example data

Before you run your own data, it is recommended to run the example datasets provided . This will confirm there are no user-specific issues with the setup and it also installs all the dependencies. The example data includes mitochondrial and ribosomal genes from 25 different butterfly species.

To run the example data, use the code below. The first time you run the pipeline, it will take some time to install each of the conda environments, so it is a good time to take a tea break :).

conda activate snakemake

snakemake \
   --cores 4 \
   --use-conda

Input

Snakemake requires a config.yaml to define input parameters.

For the example data provided, the config file is located here config/config.yaml and it looks like this:

# name of input directory containg genes
input_dir: .test

# realign (True or False)
realign: True

# alignment missing data threshold for alignment (0.0 - 1.0), only required if realign == True
missing_threshold: 0.5

# alignment trimming method to use (gblocks or clipkit), only required if realign == True
alignment_trim: gblocks

# name of outgroup sample (optional)
# use "NA" if there is no obvious outgroup
# if more than one outgroup use a comma separated list i.e. "sampleA,sampleB"
outgroup: Eurema_blanda

# plot dimensions (cm)
plot_height: 20
plot_width: 20

Output

All output files are saved to the results direcotry. Below is a table summarising all of the output files generated by the pipeline.

Running your own data

For the pipeline to function properly, the input gene alignments must be:

• in a single directory
• end with ".fasta"
• named after the aligned gene (e.g. "cox1.fasta" or "28S.fasta")
• share identical sample names across alignments (e.g. all genes from sample A share the same name)

Please see the example data in the .test/ directory as an example.

Then you need to generate your own config.yaml file, using the example template provided.

Getting help

If you have any questions, please do get in touch in the issues or by email o.william.white@gmail.com

Citations

If you use the pipeline, please cite our bioarxiv preprint: https://doi.org/10.1101/2023.08.11.552985

Since the pipeline is a wrapper for several other bioinformatic tools we also ask that you cite the tools used by the pipeline:

• Gblocks (default) https://doi.org/10.1093/oxfordjournals.molbev.a026334
• Clipkit (optional) https://doi.org/10.1371/journal.pbio.3001007
• Mafft (optional) https://doi.org/10.1093/molbev/mst010
• Iqtree https://doi.org/10.1093/molbev/msu300
• Ete3 https://doi.org/10.1093/molbev/msw046
• Ggtree https://doi.org/10.1111/2041-210X.12628
• Astral https://doi.org/10.1186/s12859-018-2129-y