Publication Date:
2014-08-15
Description:
The role of long noncoding RNA (lncRNA) in adult hearts is unknown; also unclear is how lncRNA modulates nucleosome remodelling. An estimated 70% of mouse genes undergo antisense transcription, including myosin heavy chain 7 (Myh7), which encodes molecular motor proteins for heart contraction. Here we identify a cluster of lncRNA transcripts from Myh7 loci and demonstrate a new lncRNA-chromatin mechanism for heart failure. In mice, these transcripts, which we named myosin heavy-chain-associated RNA transcripts (Myheart, or Mhrt), are cardiac-specific and abundant in adult hearts. Pathological stress activates the Brg1-Hdac-Parp chromatin repressor complex to inhibit Mhrt transcription in the heart. Such stress-induced Mhrt repression is essential for cardiomyopathy to develop: restoring Mhrt to the pre-stress level protects the heart from hypertrophy and failure. Mhrt antagonizes the function of Brg1, a chromatin-remodelling factor that is activated by stress to trigger aberrant gene expression and cardiac myopathy. Mhrt prevents Brg1 from recognizing its genomic DNA targets, thus inhibiting chromatin targeting and gene regulation by Brg1. It does so by binding to the helicase domain of Brg1, a domain that is crucial for tethering Brg1 to chromatinized DNA targets. Brg1 helicase has dual nucleic-acid-binding specificities: it is capable of binding lncRNA (Mhrt) and chromatinized--but not naked--DNA. This dual-binding feature of helicase enables a competitive inhibition mechanism by which Mhrt sequesters Brg1 from its genomic DNA targets to prevent chromatin remodelling. A Mhrt-Brg1 feedback circuit is thus crucial for heart function. Human MHRT also originates from MYH7 loci and is repressed in various types of myopathic hearts, suggesting a conserved lncRNA mechanism in human cardiomyopathy. Our studies identify a cardioprotective lncRNA, define a new targeting mechanism for ATP-dependent chromatin-remodelling factors, and establish a new paradigm for lncRNA-chromatin interaction.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4184960/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉 〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4184960/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Han, Pei -- Li, Wei -- Lin, Chiou-Hong -- Yang, Jin -- Shang, Ching -- Nurnberg, Sylvia T -- Jin, Kevin Kai -- Xu, Weihong -- Lin, Chieh-Yu -- Lin, Chien-Jung -- Xiong, Yiqin -- Chien, Huan-Chieh -- Zhou, Bin -- Ashley, Euan -- Bernstein, Daniel -- Chen, Peng-Sheng -- Chen, Huei-Sheng Vincent -- Quertermous, Thomas -- Chang, Ching-Pin -- HL105194/HL/NHLBI NIH HHS/ -- HL109512/HL/NHLBI NIH HHS/ -- HL111770/HL/NHLBI NIH HHS/ -- HL116997/HL/NHLBI NIH HHS/ -- HL118087/HL/NHLBI NIH HHS/ -- HL121197/HL/NHLBI NIH HHS/ -- HL71140/HL/NHLBI NIH HHS/ -- HL78931/HL/NHLBI NIH HHS/ -- R01 HL111770/HL/NHLBI NIH HHS/ -- R01 HL116997/HL/NHLBI NIH HHS/ -- R01 HL121197/HL/NHLBI NIH HHS/ -- England -- Nature. 2014 Oct 2;514(7520):102-6. doi: 10.1038/nature13596. Epub 2014 Aug 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA [2] Division of Cardiovascular Medicine, Cardiovascular Institute, Stanford University School of Medicine, Stanford, California 94305, USA. ; 1] Division of Cardiovascular Medicine, Cardiovascular Institute, Stanford University School of Medicine, Stanford, California 94305, USA [2]. ; Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA. ; Division of Cardiovascular Medicine, Cardiovascular Institute, Stanford University School of Medicine, Stanford, California 94305, USA. ; Stanford Genome Technology Center, Stanford University School of Medicine, Stanford, California 94305, USA. ; Department of Genetics, Pediatrics, and Medicine (Cardiology), Albert Einstein College of Medicine of Yeshiva University, 1301 Morris Park Avenue, Price Center 420, Bronx, New York 10461, USA. ; Department of Pediatrics, Stanford University School of Medicine, Stanford, California 94305, USA. ; Del E. Webb Neuroscience, Aging &Stem Cell Research Center, Sanford/Burnham Medical Research Institute, La Jolla, California 92037, USA. ; 1] Krannert Institute of Cardiology and Division of Cardiology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA [2] Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA [3] Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25119045" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Cardiac Myosins/genetics
;
Cardiomegaly/*genetics/*pathology/prevention & control
;
Cardiomyopathies/genetics/pathology/prevention & control
;
Chromatin/genetics/metabolism
;
Chromatin Assembly and Disassembly
;
DNA Helicases/antagonists & inhibitors/chemistry/genetics/metabolism
;
Feedback, Physiological
;
Heart Failure/genetics/pathology/prevention & control
;
Histone Deacetylases/metabolism
;
Humans
;
Mice
;
Myocardium/metabolism/pathology
;
Myosin Heavy Chains/*genetics
;
Nuclear Proteins/antagonists & inhibitors/chemistry/genetics/metabolism
;
Organ Specificity
;
Poly(ADP-ribose) Polymerases/metabolism
;
Protein Binding
;
Protein Structure, Tertiary
;
RNA, Long Noncoding/antagonists & inhibitors/*genetics/metabolism
;
Transcription Factors/antagonists & inhibitors/chemistry/genetics/metabolism
Print ISSN:
0028-0836
Electronic ISSN:
1476-4687
Topics:
Biology
,
Chemistry and Pharmacology
,
Medicine
,
Natural Sciences in General
,
Physics
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