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Overexpressing Long Noncoding RNAs Using Gene-activating CRISPR
Published on: March 1, 2019
ncRNA- and Pc2 methylation-dependent gene relocation between nuclear structures mediates gene activation programs
Liuqing Yang1, Chunru Lin, Wen Liu
1Howard Hughes Medical Institute, University of California, San Diego, School of Medicine, 9500 Gilman Drive, La Jolla, CA 92093-0648, USA.
Cell
|November 15, 2011
Summary
Methylation of Polycomb 2 protein (Pc2) controls growth gene movement between nuclear structures via noncoding RNAs (ncRNAs). This links nuclear architecture to gene expression regulation.
Area of Science:
- Molecular Biology
- Cell Biology
- Epigenetics
Background:
- Eukaryotic nuclei possess structures linked to noncoding RNAs (ncRNAs).
- The role of these structures in regulating transcription is not well understood.
Purpose of the Study:
- To investigate the relationship between nuclear architectural structures, ncRNAs, and transcriptional regulation.
- To elucidate the mechanism by which growth-control genes are relocated within the nucleus.
Main Methods:
- Investigated the role of Polycomb 2 protein (Pc2) methylation and demethylation.
- Studied the binding of Pc2 to ncRNAs TUG1 and MALAT1/NEAT2.
- Examined the impact on gene relocation between Polycomb bodies (PcGs) and interchromatin granules (ICGs).
- Analyzed the effects on corepressor/coactivator assembly and histone code readers.
- Assessed the role of NEAT2-Pc2 interaction in E2F1 SUMOylation and gene activation.
Main Results:
- Pc2 methylation status dictates the relocation of growth-control genes between PcGs and ICGs.
- Pc2 binds to specific ncRNAs (TUG1 in PcGs, MALAT1/NEAT2 in ICGs) based on its methylation state.
- ncRNAs facilitate the assembly of regulatory protein complexes and influence histone mark recognition.
- NEAT2 binding to unmethylated Pc2 promotes E2F1 SUMOylation, activating growth genes.
Conclusions:
- A molecular pathway connects subnuclear structure-specific ncRNAs and protein methylation to gene relocation.
- This pathway achieves coordinated gene expression programs by linking nuclear architecture to transcriptional control.
- The findings reveal a novel mechanism for regulating growth-control genes through dynamic changes in nuclear organization.
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