DISTANT JOINING: A SEQUENCE SAMPLING METHOD FOR COMPLEX PHYLOGENIES

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Alexey Morozov
Yuri Galachyants

Abstract

Motivation: Massive parallel phylogenetic analyses allow to reconstruct phylogenetic trees for every gene in
genome, typically using a set of potential homologues detected by similarity search against reference databases via
BLAST or BLAST-like algorithms. However, given that the amount of similarity hits between query sequence and
targets is often too high, it may be necessary to reduce number of sequences for downstream pelogenetic analyses..
Currently available automatic and semi-automatic methods for dataset reduction are error-prone and may depend
on additional metadata, whereas reduction “by hand” is labour-intensive and becomes intractable once
phylogenetic analysis of multiple genes is to be performed.
Results: We propose a distance-based algorithm, termed Distant Joining, for phylogenetic dataset reduction that
does not require additional input except sequences analyzed. DJ was shown to robustly subsample a set of sequences
with minimal loss of dataset divergence from large and complex sequence data sets. In the context of out study, the
underlying assumptions and limitations of different subsampling approaches are discussed, and directions for
selection of the subsampling method to build phylogenomic pipelines are provided.
Availability: Proof-of-concept Python implementation is available at https://github.com/SynedraAcus/sampler under
the terms of CC-BY-4.0 license.
Supplementary information: Supplementary data are available at Journal of Bioinformatics and Genomics online.

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How to Cite
Morozov, A., & Galachyants, Y. (2017). DISTANT JOINING: A SEQUENCE SAMPLING METHOD FOR COMPLEX PHYLOGENIES. JOURNAL OF BIOINFORMATICS AND GENOMICS, (3 (5). https://doi.org/10.18454/jbg.2017.3.5.3
Section
Phylogenetics

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