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Estimating sequence similarity from read sets for clustering next-generation sequencing data

  • Petr Ryšavý
  • Filip Železný
Article
  • 29 Downloads

Abstract

Computing mutual similarity of biological sequences such as DNA molecules is essential for significant biological tasks such as hierarchical clustering of genomes. Current sequencing technologies do not provide the content of entire biological sequences; rather they identify a large number of small substrings called reads, sampled at random places of the target sequence. To estimate similarity of two sequences from their read-set representations, one may try to reconstruct each one first from its read set, and then employ conventional (dis)similarity measures such as the edit distance on the assembled sequences. Due to the nature of data, sequence assembly often cannot provide a single putative sequence that matches the true DNA. Therefore, we propose instead to estimate the similarities directly from the read sets. Our approach is based on an adaptation of the Monge-Elkan similarity known from the field of databases, avoiding the sequence assembly step. For low-coverage (i.e. small) read set samples, it yields a better approximation of the true sequence similarities. This in turn results in better clustering in comparison to the first-assemble-then-cluster approach. Put differently, for a fixed estimation accuracy, our approach requires smaller read sets and thus entails reduced wet-lab costs.

Keywords

Read sets Similarity Hierarchical clustering Biological sequences 

Notes

Acknowledgements

The authors acknowledge the support of the OP VVV project CZ.02.1.01/0.0/0.0/16_019/0000765 “Research Center for Informatics”. Access to computing and storage facilities owned by parties and projects contributing to the National Grid Infrastructure MetaCentrum, provided under the programme “Projects of Large Research, Development, and Innovations Infrastructures” (CESNET LM2015042), is greatly appreciated.

Supplementary material

10618_2018_584_MOESM1_ESM.pdf (267 kb)
Supplementary material 1 (pdf 267 KB)

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Copyright information

© The Author(s) 2018

Authors and Affiliations

  1. 1.Department of Computer Science, Faculty of Electrical EngineeringCzech Technical University in PraguePragueCzech Republic

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