Cited by 326Cancer-related molecular mechanisms researchRNA Research and SplicingRNA and protein synthesis mechanisms

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Maternally Expressed Gene 3 (MEG3) Noncoding Ribonucleic Acid: Isoform Structure, Expression, and Functions

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Abstract

Maternally expressed gene 3 (MEG3) is an imprinted gene highly expressed in the human pituitary. However, MEG3 expression is lost in human gonadotroph-derived pituitary adenomas and most human tumor cell lines. Expression of MEG3 in tumor cells results in growth suppression, p53 protein increase, and activation of p53 downstream targets. The MEG3 gene encodes a noncoding RNA of approximately 1700 nucleotides. There are 12 different MEG3 gene transcripts, generated by alternative splicing. They contain the common exons 1-3 and exons 8-10, but each uses one or more exons 4-7 in a different combination in the middle. MEG3 isoform expression patterns are tissue and cell type specific. Functionally, each isoform stimulates p53-mediated transactivation and suppresses tumor cell growth. We analyzed the secondary RNA folding structure of each MEG3 isoform, using the computer program mfold. All MEG3 RNA isoforms contain three distinct secondary folding motifs M1, M2, and M3. Deletion analysis showed that motifs M2 and M3 are important for p53 activation. Furthermore, a hybrid MEG3 RNA, containing a piece of artificially synthesized sequence different from the wild type but folding into a similar secondary structure, retained the functions of both p53 activation and growth suppression. These results support the hypothesis that a proper folding structure of the MEG3 RNA molecule is critical for its biological functions. This study establishes for the first time the structure-function relationship of a large noncoding RNA and provides a first look into the molecular mechanisms of the biological functions of a large noncoding RNA.

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Crossref · 10.1210/en.2009-0657

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Metadata

Authors
Zhang, X., Rice, K., Wang, Y., Chen, W., Zhong, Y., Nakayama, Y., Zhou, Y., & Klibanski, A.
Affiliations
Harvard University (US)
Corresponding author
Klibanski, Anne
Venue
Endocrinology
Published
2009-12-23
Volume
151
Issue
3
Pages
939-947
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2066815559
Cited by
325
References
19
Citations by year
2026: 5 · 2025: 9 · 2024: 17 · 2023: 25 · 2022: 16 · 2021: 23 · 2020: 35 · 2019: 21 · 2018: 29 · 2017: 30 · 2016: 17 · 2015: 28 · 2014: 21 · 2013: 18 · 2012: 17
FWCI
3.47
Type
journal article
Language
en
Open access
Locations
  • Endocrinology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (R01DK040947, R01-DK-40947)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
Keywords
MEG3, imprinted genes, non-coding RNA, RNA isoforms, alternative splicing, p53 activation, structure-function relationship, pituitary adenoma, tumor growth inhibition
MeSH terms
Base Sequence, Cell Line, Humans, Molecular Sequence Data, Nucleic Acid Conformation, Pituitary Neoplasms, Proteins, Structure-Activity Relationship, Gene Expression, Tumor Suppressor Protein p53, DNA, Complementary, RNA, Untranslated, RNA, Long Noncoding

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