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traitar - The microbial trait analyzer

Project description

Traitar – the microbial trait analyzer

Traitar is a software for characterizing microbial samples from nucleotide or protein sequences. It can accurately phenotype 67 diverse traits. Please take a look at the gitHub repository for further information.

Table of Contents

Installation

Please see INSTALL.md for installation instructions.

Basic usage

traitar phenotype <in dir> <sample file> from_nucleotides <out_dir>

will trigger the standard workflow of Traitar, which is to predict open reading frames with Prodigal, annotate the coding sequences provided as nucleotide FASTAs in the for all samples in with Pfam families using HMMer and finally predict phenotypes from the models for the 67 traits.

The sample file has one column for the sample file names and one for the names as specified by the user. You can also specify a grouping of the samples in the third column, which will be shown in the generated plots. The template looks like following - The header row is mandatory; please also take a look at the sample file for the packaged example data:

sample_file_name{tab}sample_name{tab}category
sample1_file_name{tab}sample1_name[{tabl}sample_category1]
sample2_file_name{tab}sample2_name[{tabl}sample_category2]

traitar phenotype <in dir> <sample file> from_genes <out_dir>

assumes that gene prediction has been conducted already externally. In this case analysis will start with the Pfam annotation. If the output directory already exists, Traitar will offer to recompute or resume the individual analysis steps. This option is only available if the process is run interactively.

Parallel usage

Traitar can benefit from parallel execution. The -c parameter sets the number of processes used e.g. -c 2 for using two processes

traitar phenotype <in dir> <sample file> from_nucleotides out_dir -c 2

This requires installing GNU parallel as noted above.

Run Traitar with packaged sample data

traitar phenotype <traitar_dir>/data/sample_data <traitar_dir>/data/sample_data/samples.txt from_genes <out_dir> -c 2 will trigger phenotyping of Listeria grayi DSM_20601 and Listeria ivanovii WSLC3009. Computation should be done within 5 minutes. You can find out <traitar_dir> by running

python
>>> import traitar
>>> traitar.__path__

Results

Traitar provides the gene prediction results in <out_dir>/gene_prediction, the Pfam annotation in <out_dir>/pfam_annotation and the phenotype prediction in<out_dir>/phenotype prediction.

Heatmaps

The phenotype prediction is summarized in heatmaps individually for the phyletic pattern classifier in heatmap_phypat.png, for the phylogeny-aware classifier in heatmap_phypat_ggl.png and for both classifiers combined in heatmap_comb.png and provide hierarchical clustering dendrograms for phenotypes and the samples.

Phenotype prediction - Tables and flat files

These heatmaps are based on tab separated text files e.g. predictions_majority-votes_combined.txt. A negative prediction is encoded as 0, a prediction made only by the pure phyletic classifier as 1, one made by the phylogeny-aware classifier by 2 and a prediction supported by both algorithms as 3. predictions_flat_majority-votes_combined.txt provides a flat version of this table with one prediction per row. The expert user might also want to access the individual results for each algorithm in the respective sub folders phypat and phypat+PGL.

Feature tracks

If Traitar is run from_nucleotides it will generate a link between the Prodigal gene prediction and predicted phenotypes in phypat/feat_gffs and phypat+PGL/feat_gffs (no example in the sample data). The user can visualize gene prediction phenotype-specific Pfam annotations tracks via GFF files.

Feature tracks with from_genes option (experimental feature)

If the from_genes option is set, the user may specify gene GFF files via an additional column called gene_gff in the sample file. As gene ids are not consistent across gene GFFs from different sources e.g. img, RefSeq or Prodigal the user needs to specify the origin of the gene gff file via the -g / –gene_gff_type parameter. Still there is no guarantee that this works currently. Using samples_gene_gff.txt as the sample file in the above example will generate phenotype-specific Pfam tracks for the two genomes.

traitar phenotype . samples_gene_gff.txt from_genes traitar_out -g refseq

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