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Manifold Based Optimization for Single-Cell 3D Genome Reconstruction

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  • Jonas Paulsen
  • Odin Gramstad
  • Philippe Collas

Abstract

The three-dimensional (3D) structure of the genome is important for orchestration of gene expression and cell differentiation. While mapping genomes in 3D has for a long time been elusive, recent adaptations of high-throughput sequencing to chromosome conformation capture (3C) techniques, allows for genome-wide structural characterization for the first time. However, reconstruction of "consensus" 3D genomes from 3C-based data is a challenging problem, since the data are aggregated over millions of cells. Recent single-cell adaptations to the 3C-technique, however, allow for non-aggregated structural assessment of genome structure, but data suffer from sparse and noisy interaction sampling. We present a manifold based optimization (MBO) approach for the reconstruction of 3D genome structure from chromosomal contact data. We show that MBO is able to reconstruct 3D structures based on the chromosomal contacts, imposing fewer structural violations than comparable methods. Additionally, MBO is suitable for efficient high-throughput reconstruction of large systems, such as entire genomes, allowing for comparative studies of genomic structure across cell-lines and different species.Author Summary: Understanding how the genome is folded in three-dimensional (3D) space is crucial for unravelling the complex regulatory mechanisms underlying the differentiation and proliferation of cells. With recent high-throughput adaptations of chromosome conformation capture in techniques such as single-cell Hi-C, it is now possible to probe 3D information of chromosomes genome-wide. Such experiments, however, only provide sparse information about contacts between regions in the genome. We have developed a tool, based on manifold based optimization (MBO), that reconstructs 3D structures from such contact information. We show that MBO allows for reconstruction of 3D genomes more consistent with the original contact map, and with fewer structural violations compared to other, related methods. Since MBO is also computationally fast, it can be used for high-throughput and large-scale 3D reconstruction of entire genomes.

Suggested Citation

  • Jonas Paulsen & Odin Gramstad & Philippe Collas, 2015. "Manifold Based Optimization for Single-Cell 3D Genome Reconstruction," PLOS Computational Biology, Public Library of Science, vol. 11(8), pages 1-19, August.
  • Handle: RePEc:plo:pcbi00:1004396
    DOI: 10.1371/journal.pcbi.1004396
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    Cited by:

    1. Simeon Carstens & Michael Nilges & Michael Habeck, 2016. "Inferential Structure Determination of Chromosomes from Single-Cell Hi-C Data," PLOS Computational Biology, Public Library of Science, vol. 12(12), pages 1-33, December.

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