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Updated: Nov 27, 2025

Quick Fluorescent In Situ Hybridization Protocol for Xist RNA Combined with Immunofluorescence of Histone Modification in X-chromosome Inactivation
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Structural modularity of the XIST ribonucleoprotein complex.

Zhipeng Lu1,2, Jimmy K Guo3, Yuning Wei3

  • 1Center for Personal Dynamic Regulomes, Stanford University, Stanford, CA, 94305, USA. zhipengl@usc.edu.

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|December 3, 2020
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Summary
This summary is machine-generated.

XIST RNA forms a modular structure to control X chromosome inactivation. This architecture dictates interactions with proteins and modifications, revealing a new layer of gene regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Epigenetics

Background:

  • Long noncoding RNAs (lncRNAs) regulate gene expression via protein complexes.
  • The mechanism of lncRNA-protein complex organization remains largely unknown.
  • XIST RNA is crucial for X chromosome inactivation in female mammals.

Purpose of the Study:

  • To elucidate the structural organization of the XIST RNA-protein complex.
  • To understand how XIST structure dictates protein binding and function.
  • To establish a structure-function model for XIST-mediated gene regulation.

Main Methods:

  • Integration of orthogonal structure-interaction techniques.
  • RNA-protein interaction mapping using fRIP and eCLIP.
  • CRISPR-Cas9 genome editing to permute Xist repeat locations.

Main Results:

  • XIST RNA folds into a conserved, modular architecture.
  • Discrete XIST domains bind specific effector proteins.
  • The Xist A-repeat acts as a nucleation site for protein and m6A modification.
  • Modular architecture, not just sequence, determines RBP and m6A specificity.

Conclusions:

  • The modular structure of XIST RNA is essential for its function in X chromosome inactivation.
  • This structural organization provides specificity in recruiting regulatory proteins and modifications.
  • A comprehensive structure-function model for the XIST complex is proposed.
  • The study suggests a general approach for studying large ribonucleoprotein assemblies.