Introduction

sanger-tol/ensemblrepeatdownload is a pipeline that downloads repeat annotations from Ensembl into a Tree of Life directory structure.

The pipeline takes a CSV file that contains assembly accession number, Ensembl species names (as they may differ from Tree of Life ones !), output directories. Assembly accession numbers are optional too. If missing, the pipeline assumes it can be retrieved from files named ACCESSION in the standard location on disk. The pipeline downloads the repeat annotation as the masked Fasta file and a BED file. All files are compressed with bgzip, and indexed with samtools faidx or tabix.

Steps involved:

• Download the masked fasta file from Ensembl.
• Extract the coordinates of the masked regions into a BED file.
• Compress and index the BED file with bgzip and tabix.

[!WARNING] Only the Rapid Release site is currently supported, not the other Ensembl sites.

Usage

Note If you are new to Nextflow and nf-core, please refer to this page on how to set-up Nextflow. Make sure to test your setup with -profile test before running the workflow on actual data.

The easiest is to provide the exact species name and versions of the assembly and annotations like this:

nextflow run sanger-tol/ensemblrepeatdownload --ensembl_species_name Noctua_fimbriata --assembly_accession GCA_905163415.1 --annotation_method braker

Warning: Please provide pipeline parameters via the CLI or Nextflow -params-file option. Custom config files including those provided by the -c Nextflow option can be used to provide any configuration except for parameters; see docs.

The pipeline also supports bulk downloads through a sample-sheet. More information about this mode on our pipeline website.

Credits

sanger-tol/ensemblrepeatdownload was originally written by Matthieu Muffato.

We thank the following people for their assistance in the development of this pipeline:

• Priyanka Surana for providing reviews.
• Tyler Chafin for updates.

Contributions and Support

If you would like to contribute to this pipeline, please see the contributing guidelines.

For further information or help, don't hesitate to get in touch on the Slack #pipelines channel. Please create an issue on GitHub if you are not on the Sanger slack channel.

Citations

If you use sanger-tol/ensemblrepeatdownload for your analysis, please cite it using the following doi: 10.5281/zenodo.7183379

An extensive list of references for the tools used by the pipeline can be found in the CITATIONS.md file.

This pipeline uses code and infrastructure developed and maintained by the nf-core community, reused here under the MIT license.

The nf-core framework for community-curated bioinformatics pipelines.

Philip Ewels, Alexander Peltzer, Sven Fillinger, Harshil Patel, Johannes Alneberg, Andreas Wilm, Maxime Ulysse Garcia, Paolo Di Tommaso & Sven Nahnsen.

Nat Biotechnol. 2020 Feb 13. doi: 10.1038/s41587-020-0439-x.