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Published on: March 1, 2019
Transcriptional and Posttranscriptional Programming by Long Noncoding RNAs.
Radha Raman Pandey1, Chandrasekhar Kanduri
1Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Dag Hammarskjölds Väg 20, 75185, Uppsala, Sweden.
Progress in Molecular and Subcellular Biology
|February 3, 2011
Summary
Noncoding RNAs (ncRNAs), especially long noncoding RNAs (lncRNAs), are abundant in eukaryotes. Their roles in development and differentiation are being uncovered through epigenetic and nonepigenetic mechanisms.
Area of Science:
- Molecular Biology
- Genetics
- Epigenetics
Background:
- Noncoding RNAs (ncRNAs) constitute a significant portion of eukaryotic transcriptomes.
- The functional roles of ncRNAs, particularly long noncoding RNAs (lncRNAs), in development and differentiation remain largely undefined.
- Emerging evidence suggests lncRNAs participate in crucial biological functions at transcriptional and posttranscriptional levels.
Purpose of the Study:
- To discuss the mechanisms underlying the involvement of lncRNAs in biological functions.
- To explore both epigenetic and nonepigenetic pathways regulated by lncRNAs and their transcription.
- To provide insights into the programming of biological functions by lncRNAs across diverse model systems.
Main Methods:
- Review of existing literature on lncRNA function.
- Analysis of epigenetic mechanisms influenced by lncRNAs.
- Examination of nonepigenetic regulatory roles of lncRNAs.
Main Results:
- lncRNAs and their transcription are implicated in regulating gene expression.
- Both epigenetic modifications and nonepigenetic factors are involved in lncRNA-mediated functions.
- Evidence spans from yeast to mammalian model systems, indicating conserved roles.
Conclusions:
- lncRNAs play critical roles in organismal development and differentiation.
- Understanding lncRNA mechanisms is essential for deciphering complex biological processes.
- Further research into lncRNA functions will illuminate fundamental aspects of eukaryotic biology.
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lncRNA - Long Non-coding RNAs
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
lncRNA - Long Non-coding RNAs
In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA (lncRNA)...
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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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Ribosome synthesis is a highly complex and coordinated process involving more than 200 assembly factors. The synthesis and processing of ribosomal components occurs not only in the nucleolus but also in the nucleoplasm and the cytoplasm of eukaryotic cells.
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Ribosome biogenesis begins with the synthesis of 5S and 45S pre-rRNAs by distinct RNA polymerases. The primary transcripts are extensively processed and modified before they are bound and folded by ribosomal proteins and assembly factors,...
Regulation of Expression at Multiple Steps
The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

