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Multiplexed chromosome conformation capture sequencing for rapid genome-scale high-resolution detection of long-range chromatin interactions

Abstract

Chromosome conformation capture (3C) technology is a powerful and increasingly popular tool for analyzing the spatial organization of genomes. Several 3C variants have been developed (e.g., 4C, 5C, ChIA-PET, Hi-C), allowing large-scale mapping of long-range genomic interactions. Here we describe multiplexed 3C sequencing (3C-seq), a 4C variant coupled to next-generation sequencing, allowing genome-scale detection of long-range interactions with candidate regions. Compared with several other available techniques, 3C-seq offers a superior resolution (typically single restriction fragment resolution; approximately 1–8 kb on average) and can be applied in a semi-high-throughput fashion. It allows the assessment of long-range interactions of up to 192 genes or regions of interest in parallel by multiplexing library sequencing. This renders multiplexed 3C-seq an inexpensive, quick (total hands-on time of 2 weeks) and efficient method that is ideal for the in-depth analysis of complex genetic loci. The preparation of multiplexed 3C-seq libraries can be performed by any investigator with basic skills in molecular biology techniques. Data analysis requires basic expertise in bioinformatics and in Linux and Python environments. The protocol describes all materials, critical steps and bioinformatics tools required for successful application of 3C-seq technology.

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Figure 1: Overview of the multiplexed 3C-seq procedure.
Figure 2: Flowchart of multiplexed 3C-seq data generation and processing.
Figure 3: 3C-seq primer design and positioning.
Figure 4: Examples of successful digestion and ligation efficiencies.
Figure 5: Typical interaction profiles obtained from a multiplexed 3C-seq experiment.
Figure 6: Comparison of interactions detected for the same 3C-seq sample after single or multiplexed library sequencing.

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Acknowledgements

We thank A. van der Sloot, Z. Ozgur, E. Oole, M. van den Hout, F. Sleutels, S.Thongjuea and B. Lenhard for their help in sample processing, bioinformatics pipeline development and data analysis. R.S. received support from the Royal Netherlands Academy of Arts and Sciences (KNAW). P.K. was supported by grants from ERASysBio+/FP7 (project no. 93511024). E.S. was supported by grants from the Dutch Cancer Genomics Center, the Netherlands Genomics Initiative (project no. 40-41009-98-9082) and the French Alternative Energies and Atomic Energy Commission (CEA). This work was supported by the EU-FP7 Eutracc consortium.

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Authors and Affiliations

Authors

Contributions

R.S. and R.-J.P. adapted and optimized the protocol and library preparation for Illumina sequencing. R.S., P.K., A.v.d.H. and J.Z. used, developed and troubleshot the technique. C.K. optimized procedures for library sequencing, and R.B. developed the informatics pipeline for data processing and analysis. W.v.I., F.G., K.S.W. and E.S. supervised the projects, and participated in technology design and discussions. R.S., P.K., R.B., W.v.I., F.G., K.S.W. and E.S. drafted the manuscript.

Corresponding authors

Correspondence to Wilfred van Ijcken or Eric Soler.

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Competing interests

The authors declare no competing financial interests.

Supplementary information

Supplementary Data

Scripts to analyze 3C-seq data. Within this supplementary archive, 4 python files are present that are used to analyze 3C-seq data. The findSequence.py and the regionsBetween.py files are used to generate a restriction map of the genome. The alignCounter.py script determines how many reads align to each of the restriction fragments. To run the alignCounter.py script the Pysam libraries should be installed on the system (see Materials). The libutils.py script is a shared library that should be placed in the same directory as the other py files. This library contains shared functionality between the 3 executable scripts. (ZIP 5 kb)

Supplementary Table 1

NARWHAL sample sheet. This file contains an example NARWHAL sample sheet that can be used in the primary data analysis. It serves to illustrate the specific fields that should be set in the primary data analysis procedure (Steps 65-79). (TXT 1 kb)

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Stadhouders, R., Kolovos, P., Brouwer, R. et al. Multiplexed chromosome conformation capture sequencing for rapid genome-scale high-resolution detection of long-range chromatin interactions. Nat Protoc 8, 509–524 (2013). https://doi.org/10.1038/nprot.2013.018

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