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Tissue-specific miRNA Expression Profiling in Mouse Heart Sections Using In Situ Hybridization
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A long noncoding RNA protects the heart from pathological hypertrophy.

Pei Han1,2, Wei Li1, Chiou-Hong Lin1

  • 1Division of Cardiovascular Medicine, Cardiovascular Institute, Stanford University School of Medicine, Stanford, CA 94305.

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A newly discovered cardiac-specific long noncoding RNA, Mhrt, protects the adult heart by inhibiting the chromatin remodeler Brg1. Loss of Mhrt is essential for heart failure development, but restoring it prevents cardiac dysfunction.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cardiology

Background:

  • The role of long noncoding RNAs (lncRNAs) in adult heart function and their modulation of nucleosome remodeling remain largely unknown.
  • Antisense transcription is prevalent, with myosin heavy chain 7 (Myh7) being a key gene encoding proteins essential for heart contraction.

Purpose of the Study:

  • To identify and characterize novel lncRNAs in the adult heart.
  • To elucidate the mechanism by which lncRNAs interact with chromatin remodeling complexes.
  • To investigate the role of these lncRNAs in the development of heart failure and cardiomyopathy.

Main Methods:

  • Identification and characterization of cardiac-specific lncRNA transcripts from Myh7 loci in mice, named Mhrt.
  • Investigation of Mhrt's interaction with the Brg1-Hdac-Parp chromatin repressor complex under pathological stress.
  • Analysis of Mhrt's role in preventing Brg1 binding to genomic DNA targets and its impact on chromatin remodeling.

Main Results:

  • Mhrt is a cardiac-specific, abundant lncRNA in adult hearts that is repressed by pathological stress via the Brg1-Hdac-Parp complex.
  • Repression of Mhrt is essential for the development of cardiomyopathy; restoring Mhrt levels protects against cardiac hypertrophy and failure.
  • Mhrt directly binds to the helicase domain of Brg1, competitively inhibiting its DNA-binding activity and preventing aberrant gene expression and cardiac myopathy.

Conclusions:

  • A novel lncRNA-chromatin mechanism involving Mhrt and Brg1 is crucial for maintaining heart function.
  • Mhrt acts as a cardioprotective factor by antagonizing stress-induced chromatin remodeling.
  • This study establishes a new paradigm for lncRNA-chromatin interactions and identifies a conserved mechanism in human cardiomyopathy.