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Massively multiplex single-molecule oligonucleosome footprinting.

Nour J Abdulhay1, Colin P McNally1, Laura J Hsieh1

  • 1Department of Biochemistry & Biophysics, University of California San Francisco, San Francisco, United States.

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|December 2, 2020
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Summary

This study introduces the single-molecule adenine methylated oligonucleosome sequencing assay (SAMOSA) to map nucleosome positions on individual chromatin fibers. SAMOSA reveals both regular and irregular nucleosome patterns across the genome, challenging static views of chromatin structure.

Keywords:
chromatinchromosomesgene expressiongeneticsgenomicshigh-throughput sequencinghumannucleosomes

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Area of Science:

  • Genomics
  • Epigenetics
  • Molecular Biology

Background:

  • Current methods for studying nucleosome arrangement lack single-molecule resolution or sequence specificity.
  • Bridging the gap between imaging and biochemical techniques is crucial for understanding chromatin organization.

Purpose of the Study:

  • To develop a novel high-throughput single-molecule sequencing method for measuring nucleosome positions on individual chromatin fibers.
  • To enable unbiased classification of nucleosome occupancy states and assess chromatin regularity and spacing at single-molecule resolution.

Main Methods:

  • The single-molecule adenine methylated oligonucleosome sequencing assay (SAMOSA) combines adenine methyltransferase footprinting with single-molecule real-time DNA sequencing.
  • This method natively and nondestructively measures nucleosome positions on individual chromatin fibers.
  • Data analysis allows for unbiased classification of single-molecular nucleosome occupancy states.

Main Results:

  • SAMOSA enables genome-wide estimation of nucleosome regularity and spacing on single chromatin fibers.
  • Analysis revealed both regular and irregular single-molecular nucleosome patterns within chromatin.
  • Striking irregularity was observed in constitutive heterochromatin, previously considered conformationally static.

Conclusions:

  • SAMOSA provides a powerful new methodology for studying nucleosome organization at unprecedented resolution.
  • The findings challenge traditional views of chromatin structure, particularly in heterochromatin.
  • This technique opens new avenues for modeling and visualizing higher-order chromatin structure.