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DOI: 10.4230/LIPIcs.WABI.2021.18

Genome Halving and Aliquoting Under the Copy Number Distance

Authors: Ron Zeira, Geoffrey Mon, and Benjamin J. Raphael

Published in: LIPIcs, Volume 201, 21st International Workshop on Algorithms in Bioinformatics (WABI 2021)

Abstract

Large-scale genome rearrangements occur frequently in species evolution and cancer evolution. While the computation of evolutionary distances is tractable for balanced rearrangements, such as inversions and translocations, computing distances involving duplications and deletions is much more difficult. In the recently proposed Copy Number Distance (CND) model, a genome is represented as a Copy Number Profile (CNP), a sequence of integers, and the CND between two CNPs is the length of a shortest sequence of deletions and amplifications of contiguous segments that transforms one CNP into the other. In addition to these segmental events, genomes also undergo global events such as Whole Genome Duplication (WGD) or polyploidization that multiply the entire genome content. These global events are common and important in both species and cancer evolution. In this paper, we formulate the genome halving problem of finding a closest preduplication CNP that has undergone a WGD and evolved into a given CNP under the CND model. We also formulate the analogous genome aliquoting problem of finding the closest prepolyploidzation CNP under the CND distance. We give a linear time algorithm for the halving distance and a quadratic time dynamic programming algorithm for the aliquoting distance. We implement these algorithms and show that they produce reasonable solutions on simulated CNPs.

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Ron Zeira, Geoffrey Mon, and Benjamin J. Raphael. Genome Halving and Aliquoting Under the Copy Number Distance. In 21st International Workshop on Algorithms in Bioinformatics (WABI 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 201, pp. 18:1-18:25, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{zeira_et_al:LIPIcs.WABI.2021.18,
  author =	{Zeira, Ron and Mon, Geoffrey and Raphael, Benjamin J.},
  title =	{{Genome Halving and Aliquoting Under the Copy Number Distance}},
  booktitle =	{21st International Workshop on Algorithms in Bioinformatics (WABI 2021)},
  pages =	{18:1--18:25},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-200-6},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{201},
  editor =	{Carbone, Alessandra and El-Kebir, Mohammed},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.WABI.2021.18},
  URN =		{urn:nbn:de:0030-drops-143711},
  doi =		{10.4230/LIPIcs.WABI.2021.18},
  annote =	{Keywords: Genome rearrangements, Copy number distance, Whole genome duplication, polyploidization, genome halving distance, genome aliquoting distance}
}

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Genome Halving and Aliquoting Under the Copy Number Distance

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