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7SK RNA, a non-coding RNA regulating P-TEFb, a general transcription factor
Gaelle Diribarne1, Olivier Bensaude
1Ecole Normale Supérieure, CNRS UMR 8541 Régulation de l'Expression Génétique, Paris, France.
RNA Biology
|February 28, 2009
Summary
7SK RNA, a nuclear transcript, regulates gene transcription by inhibiting Positive Transcriptional Elongation Factor b (P-TEFb). This non-coding RNA plays a conserved role in controlling transcription elongation across species.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- 7SK RNA is a highly abundant nuclear transcript produced by RNA polymerase III.
- It interacts with HEXIM1/2 proteins, forming inhibitors of Positive Transcriptional Elongation Factor b (P-TEFb).
- P-TEFb is crucial for the elongation phase of RNA polymerase II transcription.
Purpose of the Study:
- To elucidate the regulatory role of 7SK RNA in transcription.
- To understand the mechanism of P-TEFb inhibition and activation.
- To explore the evolutionary conservation and structural features of 7SK RNA.
Main Methods:
- Analysis of RNA polymerase III transcripts.
- Protein-RNA interaction studies (HEXIM1/2, P-TEFb, hnRNP).
- Investigation of transcription arrest and physiological stimulation effects.
- Comparative genomics for evolutionary conservation.
Main Results:
- 7SK RNA binding to HEXIM1/2 inhibits P-TEFb, thereby regulating transcription elongation.
- Release of 7SK RNA from complexes activates P-TEFb during transcription arrest and stimuli like cardiac hypertrophy.
- Released 7SK RNA binds to heterogeneous nuclear ribonucleoproteins (hnRNPs).
- 7SK RNA exhibits conserved structures with hairpins for protein binding, stabilized by 5'-triphosphate methylation and LARP7.
Conclusions:
- 7SK RNA acts as a key regulator of transcription elongation by modulating P-TEFb activity.
- Its release mechanism allows for dynamic control of transcription in response to cellular signals.
- 7SK RNA serves as a paradigm for non-coding RNAs in transcriptional regulation and is evolutionarily conserved.
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