tantan on Biowulf

Tantan masks low complexity and short-period tandem repeats in nucleic acid and protein sequences. It either lower-cases the selected regions or replaces them with a configurable letter.

References:

Documentation
Important Notes

Interactive job
Interactive jobs should be used for debugging, graphics, or applications that cannot be run as batch jobs.

Allocate an interactive session and run the program. Sample session:

[user@biowulf]$ sinteractive
salloc.exe: Pending job allocation 46116226
salloc.exe: job 46116226 queued and waiting for resources
salloc.exe: job 46116226 has been allocated resources
salloc.exe: Granted job allocation 46116226
salloc.exe: Waiting for resource configuration
salloc.exe: Nodes cn3144 are ready for job

[user@cn3144]$ module load tantan
[user@cn3144]$ # mask repetitive regions with lower case letters (DNA)
[user@cn3144]$ tantan $TANTAN_TEST_DATA/CM001971.fa > test.fa
[user@cn3144]$ head -n6 test.fa
>CM001971.1 Homo sapiens mitochondrion, complete sequence, whole genome shotgun sequence
CAGGTCTATCACCCTATTAACCACTCACGGGAGCTCTCCATGCATTTGGT
ATTTTCGTCTGGGGGGTGTGCACGCGATAGCATTGCGAGACGCTGGAGCC
GGAGCACCCTATGTCGCAGTATCTGTCTTTGATTCCTGCCTCATCCTATT
ATTTATCGCACCTACGTTCAATATTACAGACGAACATACTTACTAAAGCG
TGTTAATtaattaaTGCTTGTAGGACATAATAATAACAATTGAATGTCTG
       |-----| masked region
[user@cn3144]$ # same, but replace with 'N' insead
[user@cn3144]$ tantan -x N $TANTAN_TEST_DATA/CM001971.fa > test.fa
[user@cn3144]$ head -n6 test.fa
>CM001971.1 Homo sapiens mitochondrion, complete sequence, whole genome shotgun sequence
CAGGTCTATCACCCTATTAACCACTCACGGGAGCTCTCCATGCATTTGGT
ATTTTCGTCTGGGGGGTGTGCACGCGATAGCATTGCGAGACGCTGGAGCC
GGAGCACCCTATGTCGCAGTATCTGTCTTTGATTCCTGCCTCATCCTATT
ATTTATCGCACCTACGTTCAATATTACAGACGAACATACTTACTAAAGCG
TGTTAATNNNNNNNTGCTTGTAGGACATAATAATAACAATTGAATGTCTG
       |-----| masked region

[user@cn3144]$ # and for proteins
[user@cn3144]$ tantan -p $TANTAN_TEST_DATA/NP_002102.fa > test.fa
[user@cn3144]$ head -n3 test.fa
>NP_002102.4 huntingtin [Homo sapiens]
MATLEKLMKAFESLKSFQqqqqqqqqqqqqqqqqqqqqqqpppppppppp
pqlpqpppqaqpllpqpqppppppppppgpavaEEPLHRPKKELSATKKD

[user@cn3144]$ exit
salloc.exe: Relinquishing job allocation 46116226
[user@biowulf]$

Batch job
Most jobs should be run as batch jobs.

Create a batch input file (e.g. tantan.sh) similar to the following example:

#! /bin/bash

module load tantan/13 || exit 1
tantan -p human_genome.fa > human_genome_masked.fa

Submit this job using the Slurm sbatch command.

sbatch --cpus-per-task=2 --mem=4g tantan.sh
Swarm of Jobs
A swarm of jobs is an easy way to submit a set of independent commands requiring identical resources.

Create a swarmfile (e.g. tantan.swarm). For example:

tantan -p seq1.fa > seq1_masked.fa
tantan -p seq2.fa > seq2_masked.fa
tantan -p seq3.fa > seq3_masked.fa

Submit this job using the swarm command.

swarm -f tantan.swarm -g 2 -t 1 -p 2 --module tantan/13
where
-g # Number of Gigabytes of memory required for each process (1 line in the swarm command file)
-t # Number of threads/CPUs required for each process (1 line in the swarm command file).
--module tantan Loads the tantan module for each subjob in the swarm