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title = "BLAST"
description = "How to use BLAST on HCC machines"
weight = "52"
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[BLAST] (https://blast.ncbi.nlm.nih.gov/Blast.cgi) is a local alignment tool that finds similarity between sequences. This tool compares nucleotide or protein sequences to sequence databases, and calculates significance of matches. Sometimes these input sequences are large and using the command-line BLAST is required.
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The following pages, [Create Local BLAST Database]({{<relref "create_local_blast_database" >}}) and [Running BLAST Alignment]({{<relref "running_blast_alignment" >}}) describe how to run some of the most common BLAST executables as a single job using the SLURM scheduler on HCC.
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### Useful Information
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In order to test the BLAST (blast/2.2) performance on Crane, we aligned three nucleotide query datasets, `small.fasta`, `medium.fasta` and `large.fasta`, against the non-redundant nucleotide **nt.fasta** database from NCBI. Some statistics about the query datasets and the time and memory resources used for the alignment are shown on the table below:
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{{< readfile file="/static/html/blast.html" >}}