Information dropout patterns in restriction site associated DNA phylogenomics and a comparison with multilocus Sanger data in a species-rich moth genus

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Lee , K M , Kivelä , S M , Ivanov , V , Hausmann , A , Kaila , L , Wahlberg , N & Mutanen , M 2018 , ' Information dropout patterns in restriction site associated DNA phylogenomics and a comparison with multilocus Sanger data in a species-rich moth genus ' , Systematic Biology , vol. 67 , no. 6 , pp. 925-939 . https://doi.org/10.1093/sysbio/syy029 , https://doi.org/10.1093/sysbio/syy029

Title: Information dropout patterns in restriction site associated DNA phylogenomics and a comparison with multilocus Sanger data in a species-rich moth genus
Author: Lee, Kyung Min; Kivelä, Sami M.; Ivanov, Vladislav; Hausmann, Axel; Kaila, Lauri; Wahlberg, Niklas; Mutanen, Marko
Contributor: University of Helsinki, Zoology
Date: 2018-11
Language: eng
Number of pages: 15
Belongs to series: Systematic Biology
ISSN: 1063-5157
URI: http://hdl.handle.net/10138/307940
Abstract: A rapid shift from traditional Sanger sequencing-based molecular methods to the phylogenomic approach with large numbers of loci is underway. Among phylogenomic methods, restriction site associated DNA (RAD) sequencing approaches have gained much attention as they enable rapid generation of up to thousands of loci randomly scattered across the genome and are suitable for nonmodel species. RAD data sets however suffer from large amounts of missing data and rapid locus dropout along with decreasing relatedness among taxa. The relationship between locus dropout and the amount of phylogenetic information retained in the data has remained largely uninvestigated. Similarly, phylogenetic hypotheses based on RAD have rarely been compared with phylogenetic hypotheses based on multilocus Sanger sequencing, even less so using exactly the same species and specimens. We compared the Sanger-based phylogenetic hypothesis (8 loci; 6172 bp) of 32 species of the diverse moth genus Eupithecia (Lepidoptera, Geometridae) to that based on double-digest RAD sequencing (3256 loci; 726,658 bp). We observed that topologies were largely congruent, with some notable exceptions that we discuss. The locus dropout effect was strong. We demonstrate that number of loci is not a precise measure of phylogenetic information since the number of single-nucleotide polymorphisms (SNPs) may remain low at very shallow phylogenetic levels despite large numbers of loci. As we hypothesize, the number of SNPs and parsimony informative SNPs (PIS) is low at shallow phylogenetic levels, peaks at intermediate levels and, thereafter, declines again at the deepest levels as a result of decay of available loci. Similarly, we demonstrate with empirical data that the locus dropout affects the type of loci retained, the loci found in many species tending to show lower interspecific distances than those shared among fewer species. We also examine the effects of the numbers of loci, SNPs, and PIS on nodal bootstrap support, but could not demonstrate with our data our expectation of a positive correlation between them. We conclude that RAD methods provide a powerful tool for phylogenomics at an intermediate phylogenetic level as indicated by its broad congruence with an eight-gene Sanger data set in a genus of moths. When assessing the quality of the data for phylogenetic inference, the focus should be on the distribution and number of SNPs and PIS rather than on loci.
Subject: Allelic dropout
ddRAD sequencing
Eupithecia
Lepidoptera
locus dropout
molecular systematics
parsimony informative SNPs
RAD sequencing
SNP dropout
ANCHORED HYBRID ENRICHMENT
RADSEQ
PHYLOGENETICS
INTROGRESSION
EVOLUTIONARY
RESOLUTION
TAXA
TREE
1181 Ecology, evolutionary biology
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