emapper2gbk 0.3.1

Build .gbk files starting from eggnog annotation files and genomes (fasta)

emapper2gbk: creation of genbank files from Eggnog-mapper annotation outputs

Starting from fasta and Eggnog-mapper annotation files, build a gbk file that is suitable for metabolic network reconstruction with Pathway Tools. Adds the GO terms and EC numbers annotations in the genbank file. There are two main modes:

• genes mode: suitable when a list of isolated genes/proteins have been annotated with Eggnog-mapper, typically the gene catalogue of a metagenome.

• genomes mode: usually when focusing on a single organism, with a .gff file. The creation of genbanks can be performed in parallel by providing directories (with matching names for genomes, proteomes and annotation files) as inputs.

If you use emapper2gbk, please cite

Belcour* A, Frioux* C, Aite M, Bretaudeau A, Hildebrand F, Siegel A. Metage2Metabo, microbiota-scale metabolic complementarity for the identification of key species. eLife 2020;9:e61968 https://doi.org/10.7554/eLife.61968 .

Main inputs

emapper2gbk genes

For each annotated list of genes, inputs are:

• a nucleotide fasta file containing the CDS sequence of each genes or a folder containing multiple nucleotide fasta files.

• the translated sequences in amino-acids in fasta or a folder containing the corresponding protein sequences to the nucleotide sequences (must be the same name).

• the annotation file obtained after Eggnog-mapper annotation (usually xxx.emapper.annotation) or a folder with multiple annotation files (must be the same name as nucleotide fasta file and ends with ‘.tsv’ extension).

In addition, as optional files:

• the name of the considered organism (can be “bacteria” or “metagenome”) or a file with organisms names (matching the genomes names).

• the merge option to merge genes into fake contigs.

• the number of available cores for multiprocessing (when working on multiple genomes).

• a go-basic file of GO ontology (if not given, emapper2gbk will download a copy and use it).

Example:

Input with files:

nucleotide_sequences.fna
protein_sequence.faa
annotation.emapper.annotation

Input with folders:

nucleotide_sequences
├── gene_list_1.fna
├── gene_list_2.fna
protein_sequence
├── gene_list_1.faa
├── gene_list_2.faa
annotation
├── gene_list_1.tsv
├── gene_list_2.tsv

To work the ID of the genes in the nucleic fasta file (-fn) must be the same than the ID of the proteins in the protein fasta file (-fp) and in the annotation file (-a).

emapper2gbk genomes

For each genomes, inputs are:

• a nucleotide fasta file containing the sequence of each contigs/chromosomes for the genome or a folder containing multiple nucleotide fasta files.

• the proteome corresponding to the genome or a folder containing the corresponding protein sequences to the nucleotide sequences (having the same name as the nucleotides files).

• the GFF file corresponding to the genome or a folder containing multiple GFF files (each GFF files must have the same name as the corresponding nucleotide files).

• the annotation file obtained after Eggnog-mapper annotation (usually xxx.emapper.annotation) or a folder with multiple annotation files (must be the same name as nucleotide fasta file and ends with ‘.tsv’ extension)

In addition, as optional files:

• the name of the considered organism (can be “bacteria”) or a file with organisms names (matching the genomes names).

• the number of available cores for multiprocessing (when working on multiple genomes).

• a go-basic file of GO ontology (if not given, emapper2gbk will download a copy and use it).

Example:

Input with files:

nucleotide_sequences.fna
protein_sequence.faa
annotation.emapper.annotation
genome.gff

Input with folders:

nucleotide_sequences
├── genome_1.fna
├── genome_2.fna
protein_sequence
├── genome_1.faa
├── genome_2.faa
annotation
├── genome_1.tsv
├── genome_2.tsv
gff
├── genome_1.gff
├── genome_2.gff

The ID in the chromosome/contigs/scaffolds fasta file (-fn) must correspond to region in the gff file (-g). Then the genes in the region will be found and the child CDS associated to the genes wil be extracted. The CDS ID must be the same than the ID in the protein fasta file (-fp) and the ID in the eggnog-mapper annotation file (-a).

By default emapper2gbk searches for inheritance between genes and CDS in the GFF files. A gene feature is required and the CDS feature must have the gene feature as a parent, like in this example:

##gff file
region_1    RefSeq  region  1       12642   .       +       .       ID=region_1
region_1    RefSeq  gene    1       2445    .       -       .       ID=gene_1
region_1    RefSeq  CDS     1       2445    .       -       0       ID=cds_1;Parent=gene_1

Depending on which field (CDS, mRNA or gene) of the gff is associated with the proteome IDs in faa file, the gff-type (-gt) option can take into account these 3 parameters (CDS, mRNA, gene). The tool also takes into account particular gff formats (Gmove and eggnog) and the gff-type option (-gt) can take these 2 parameters (gmove, eggnog).

CDS gff type

For example, some GFF files can be formatted differently with only CDS (such as in Prodigal or Prokka GFF), it is possible to use them with -gt CDS (case sensitive). Here is an example of the format accepted by this command (with ID cds_1 being the same as the one in the faa and eggnogg-mapper files):

##gff file
region_1    RefSeq  CDS     1       2445    .       -       0       ID=cds_1

mRNA gff type

The -gt mRNA option (case sensitive) is to be used in case the protein identifiers in the faa file match the identifiers in the “mRNA” field of the gff. Here is an example of the format accepted by this command (with ID cds_1 being the same as the one in the faa and eggnogg-mapper files):

##gff file
region_1    RefSeq  mRNA    1       2445    .       -       0       ID=cds_1

It is useful for gff formats containing multiple “CDS” fields associated with 1 gene and/or 1 mRNA and a single sequence in the faa file.

gene gff type

The -gt gene option is to be used in case the protein identifiers in the faa file match the identifiers in the “gene” field of the gff. Here is an example of the format accepted by this command (with ID cds_1 being the same as the one in the faa and eggnogg-mapper files):

##gff file
region_1    RefSeq  gene    1       2445    .       -       0       ID=cds_1

Gmove gff type

The tool handle GFF from Gmove (with -gt gmove) with the following format:

##gff file
region_1    Gmove   mRNA    1       2445    .       +       .       ID=mRNA_gene_1;Name=mRNA_gene_1
region_1    Gmove   CDS     1       2445    .       -       0       Parent=mRNA_gene_1

For gmove, the proteins in the faa and eggnogg-mapper files will be prefixed with prot_ (like prot_gene_1 for mRNA_gene_1). Emapper2gbk should be able to handle these differences.

EggNog gff type

It is also possible to use the GFF created by eggnog-mapper (if a fasta genome was given as input to eggnog-mapper) with -gt eggnog. An example of such use can be seen in the test folder.

Dependencies and installation

Dependencies

All are described in requirements.txt and can be installed with pip install -r requirements.txt.

• biopython

• gffutils

• pandas

• pronto

• requests

Install

• From this cloned repository

pip install -r requirements.txt
pip install .

• From Pypi

pip install emapper2gbk

Usage

Convert GFF, fastas, annotation table and species name into Genbank.

usage: emapper2gbk [-h] [-v] {genes,genomes} ...

Starting from fasta and Eggnog-mapper annotation files, build a gbk file that is suitable for metabolic network reconstruction with Pathway Tools. Adds the GO terms and EC numbers annotations in the genbank file.

Two modes:
- genomes (one genome/proteome/gff/annot file --> one gbk).
- genes with the annotation of the full gene catalogue and fasta files (nucleic and protein) corresponding to list of genes.

Examples:

* Genomic - single mode

emapper2gbk genomes -fn genome.fna -fp proteome.faa -gff genome.gff -n "Escherichia coli" -o coli.gbk -a eggnog_annotation.tsv [-go go-basic.obo]

* Genomic - multiple mode, "bacteria" as default name

emapper2gbk genes -fn genome_dir/ -fp proteome_dir/ -n metagenome -o gbk_dir/ -a eggnog_annotation_dir/ [-go go-basic.obo]

* Genomic - multiple mode, tsv file for organism names

emapper2gbk genes -fn genome_dir/ -fp proteome_dir/ -nf matching_genome_orgnames.tsv -o gbk_dir/ -a eggnog_annotation_dir/ [-go go-basic.obo]

* Metagenomic

emapper2gbk genes -fn genome_dir/ -fp proteome_dir/ -o gbk_dir/ -a gene_cat_ggnog_annotation.tsv --one-annot-file [-go go-basic.obo]

You can give the GO ontology as an input to the program, it will be otherwise downloaded during the run. You can download it here: http://purl.obolibrary.org/obo/go/go-basic.obo .
The program requests the NCBI database to retrieve taxonomic information of the organism. However, if the organism is "bacteria" or "metagenome", the taxonomic information will not have to be retrieved online.
Hence, if you need to run the program from a cluster with no internet access, it is possible for a "bacteria" or "metagenome" organism, and by providing the GO-basic.obo file.
For specific help on each subcommand use: emapper2gbk {cmd} --help

optional arguments:
-h, --help       show this help message and exit
-v, --version    show program's version number and exit

subcommands:
valid subcommands:

{genes,genomes}
    genes          genes mode : 1-n annot, 1-n faa, 1-n fna (gene sequences) --> 1 gbk
    genomes        genomes mode: 1-n contig/chromosome fasta, 1-n protein fasta, 1-n GFF, 1-n annot --> 1 gbk

• Genomes mode

  • Usage

    usage: emapper2gbk genomes [-h] -fn FASTANUCLEIC -fp FASTAPROT -o OUPUT_DIR -g GFF [-gt GFF_TYPE] [-nf NAMEFILE]
                            [-n NAME] -a ANNOTATION [-c CPU] [-go GOBASIC] [-q] [--keep-gff-annotation]
    
    Build a gbk file for each genome with an annotation file for each
    
    optional arguments:
    -h, --help            show this help message and exit
    -fn FASTANUCLEIC, --fastanucleic FASTANUCLEIC
                            fna file or directory
    -fp FASTAPROT, --fastaprot FASTAPROT
                            faa file or directory
    -o OUPUT_DIR, --out OUPUT_DIR
                            output directory/file path
    -g GFF, --gff GFF     gff file or directory
    -gt GFF_TYPE, --gff-type GFF_TYPE
                            gff type, by default emapper2gbk search for CDS with gene as Parent in the GFF, but by using
                            the '-gt cds_only' option emapper2gbk will only use the CDS information from the genome
    -nf NAMEFILE, --namefile NAMEFILE
                            organism/genome name (col 2) associated to genome file basenames (col 1). Default =
                            'metagenome' for metagenomic and 'cellular organisms' for genomic
    -n NAME, --name NAME  organism/genome name in quotes
    -a ANNOTATION, --annotation ANNOTATION
                            eggnog annotation file or directory
    -c CPU, --cpu CPU     cpu number for metagenomic mode or genome mode using input directories
    -go GOBASIC, --gobasic GOBASIC
                            go ontology, GOBASIC is either the name of an existing file containing the GO Ontology or the
                            name of the file that will be created by emapper2gbk containing the GO Ontology
    -q, --quiet           quiet mode, only warning, errors logged into console
    --keep-gff-annotation
                            Copy the annotation from the GFF (product) into the genbank output file.

  • Examples

    • Genomic - single mode

    emapper2gbk genomes -fn genome.fna -fp proteome.faa -gff genome.gff -n "Escherichia coli" -o coli.gbk -a eggnog_annotation.tsv [-go go-basic.obo]

    • Genomic - multiple mode, “bacteria” as default name

• genes mode

  • Usage

    usage: emapper2gbk genes [-h] -fn FASTANUCLEIC -fp FASTAPROT -o OUPUT_DIR [--one-annot-file] -a ANNOTATION [-c CPU]
                            [-n NAME] [-nf NAMEFILE] [-go GOBASIC] [--merge MERGE] [-q]
    
    Build a gbk file for each genome/set of genes with an annotation file for each
    
    optional arguments:
    -h, --help            show this help message and exit
    -fn FASTANUCLEIC, --fastanucleic FASTANUCLEIC
                            fna file or directory
    -fp FASTAPROT, --fastaprot FASTAPROT
                            faa file or directory
    -o OUPUT_DIR, --out OUPUT_DIR
                            output directory/file path
    --one-annot-file      Option to use when there is only one annotation file for multiples genes fastas.
    -a ANNOTATION, --annotation ANNOTATION
                            eggnog annotation file or directory
    -c CPU, --cpu CPU     cpu number for metagenomic mode or genome mode using input directories
    -n NAME, --name NAME  organism/genome name in quotes
    -nf NAMEFILE, --namefile NAMEFILE
                            organism/genome name (col 2) associated to genome file basenames (col 1). Default =
                            'metagenome' for metagenomic and 'cellular organisms' for genomic
    -go GOBASIC, --gobasic GOBASIC
                            go ontology, GOBASIC is either the name of an existing file containing the GO Ontology or the
                            name of the file that will be created by emapper2gbk containing the GO Ontology
    --merge MERGE         Number of gene sequences to merge into fake contig from a same file in the genbank file.
    -q, --quiet           quiet mode, only warning, errors logged into console

  • Example

    emapper2gbk genes -fn genome_dir/ -fp proteome_dir/ -o gbk_dir/ -a gene_cat_ggnog_annotation.tsv [-go go-basic.obo]