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Single-cell multiplex chromatin and RNA interactions in ageing human brain.

Xingzhao Wen1, Zhifei Luo2,3, Wenxin Zhao2

  • 1Program in Bioinformatics and Systems Biology, University of California San Diego, La Jolla, CA, USA.

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Summary

A new technique called MUSIC maps chromatin interactions, gene expression, and RNA-chromatin links in single cells. This revealed links between reduced chromatin interactions, aging, and Alzheimer's disease in the human brain.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Neuroscience

Background:

  • Chromatin complexes are dynamic and heterogeneous, changing with cell differentiation and age.
  • Understanding chromatin organization and its relation to gene expression in single cells is crucial.

Purpose of the Study:

  • To develop a novel technique for simultaneous profiling of chromatin interactions, gene expression, and RNA-chromatin associations in single cells.
  • To investigate cellular heterogeneity and chromatin organization in the aging human frontal cortex.

Main Methods:

  • Introduced the multinucleic acid interaction mapping in single cells (MUSIC) technique.
  • Applied MUSIC to human frontal cortex samples from older donors.
  • Analyzed multiplex chromatin interactions, gene expression, and RNA-chromatin associations at the single-nucleus level.

Main Results:

  • MUSIC delineated diverse cortical cell types and states.
  • Fewer short-range chromatin interactions correlated with 'older' transcriptomic signatures and Alzheimer's disease pathology.
  • Observed cell-type-specific chromatin contacts between cis-regulatory elements and promoters, impacting gene expression.
  • Identified highly heterogeneous XIST RNA-X chromosome interactions and diverse X chromosome organizations in female cortical cells.

Conclusions:

  • MUSIC is a powerful tool for exploring chromatin architecture and transcription at cellular resolution in complex tissues.
  • The study provides insights into chromatin dynamics, aging, and Alzheimer's disease pathology at the single-cell level.
  • Revealed sex-specific differences in X chromosome organization and regulation.