PASTASpark: multiple sequence alignment meets Big Data.

Motivation: One basic step in many bioinformatics analyses is the multiple sequence alignment. One of the state-of-the-art tools to perform multiple sequence alignment is PASTA (Practical Alignments using SATe and TrAnsitivity). PASTA supports multithreading but it is limited to process datasets on shared memory systems. In this work we introduce PASTASpark, a tool that uses the Big Data engine Apache Spark to boost the performance of the alignment phase of PASTA, which is the most expensive task in terms of time consumption. Results: Speedups up to 10x with respect to single-threaded PASTA were observed, which allows to process an ultra-large dataset of 200 000 sequences within the 24-h limit. Availability and implementation: PASTASpark is an Open Source tool available at https://github.com/citiususc/pastaspark Contact: josemanuel.abuin@usc.es Supplementary information: Supplementary data are available at Bioinformatics online.