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Minimal Phylogenetic Supertrees and Local Consensus Trees

1 Department of Computing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong;
2 NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, 28 Medical Drive, Singapore 117456;
3 School of Computing, National University of Singapore, 13 Computing Drive, Singapore 117417;
4 Genome Institute of Singapore, 60 Biopolis Street, Genome, Singapore 138672

Special Issue: The Future of Informatics in Biomedicine

The problem of constructing a minimally resolved phylogenetic supertree (i.e., a rootedtree having the smallest possible number of internal nodes) that contains all of the rooted triplets froma consistent set R is known to be NP-hard. In this article, we prove that constructing a phylogenetictree consistent with R that contains the minimum number of additional rooted triplets is also NP-hard,and develop exact, exponential-time algorithms for both problems. The new algorithms are applied toconstruct two variants of the local consensus tree; for any set S of phylogenetic trees over some leaflabel set L, this gives a minimal phylogenetic tree over L that contains every rooted triplet present in alltrees in S, where “minimal” means either having the smallest possible number of internal nodes or thesmallest possible number of rooted triplets. (The second variant generalizes the RV-II tree, introducedby Kannan et al. in 1998.) We also measure the running times and memory usage in practice of thenew algorithms for various inputs. Finally, we use our implementations to experimentally investigatethe non-optimality of Aho et al.’s well-known BUILD algorithm from 1981 when applied to the localconsensus tree problems considered here.
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© 2018 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

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