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Use of Alu Element Containing Minigenes to Analyze Circular RNAs
Published on: March 10, 2020
Multiple Roles of Alu-Related Noncoding RNAs
Audrey Berger1, Katharina Strub
1Department of Cell Biology, University of Geneva, 30 quai Ernest Ansermet, 1211, Geneva 4, Switzerland.
Progress in Molecular and Subcellular Biology
|February 3, 2011
Summary
Repetitive elements called Alu RNAs are found in the human genome and play roles in cellular stress response, gene regulation, and microRNA biogenesis. These versatile RNAs are involved in various cellular processes, including transcription and translation.
Area of Science:
- Genomics
- Molecular Biology
- RNA Biology
Background:
- Repetitive elements, such as Alu and Alu-related sequences, are abundant in primate and rodent genomes, reaching millions of copies in humans via retrotransposition.
- These elements are transcribed by RNA Polymerase III, with expression levels increasing under cellular stress conditions.
Purpose of the Study:
- To investigate the diverse functions of Alu RNAs in cellular processes.
- To explore the role of Alu RNAs in stress response, gene regulation, and RNA processing.
Main Methods:
- Analysis of Alu element distribution and copy number in the human genome.
- Studying the transcription of Alu elements under normal and stress conditions.
- Investigating the assembly of Alu RNAs into ribonucleoprotein complexes.
- Examining the processing of Alu RNAs into smaller RNAs (scAlu RNAs).
- Assessing the impact of Alu elements on transcription and translation.
- Exploring the role of Alu RNAs in microRNA biogenesis and targeting.
- Investigating the effect of Alu-mediated RNA editing on mRNA localization.
Main Results:
- Alu RNAs are implicated in cellular stress response, with their transcription increasing post-stress.
- Alu RNAs form ribonucleoprotein complexes and can be processed into scAlu RNAs.
- These RNAs regulate both transcription and translation.
- Alu elements serve as a source for microRNA biogenesis and can be targeted by microRNAs when embedded in mRNAs.
- Alu sequences in inverted repeats within mRNAs are substrates for editing enzymes, leading to nuclear retention of the modified mRNAs.
- Specific Alu elements have evolved into distinct transcription units producing RNAs with specialized cellular functions.
Conclusions:
- Alu RNAs are multifunctional genomic elements with significant roles in cellular homeostasis and gene regulation.
- Their involvement spans stress response, RNA processing, microRNA pathways, and mRNA metabolism.
- The evolution of specific Alu transcription units highlights their adaptability and importance in cellular function.
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