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Related Concept Videos

RNA Splicing01:32

RNA Splicing

Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA Splicing01:32

RNA Splicing

Splicing is the process by which eukaryotic RNA is edited before its translation into protein. The RNA strand transcribed from eukaryotic DNA is called the primary transcript. The primary transcripts that become mRNAs are called precursor messenger RNAs (pre-mRNAs). Eukaryotic pre-mRNA contains alternating sequences of exons and introns. Exons are nucleotide sequences that code for proteins, whereas introns are the non-coding regions. In RNA splicing, introns are removed and exons are bonded...
RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

Pre-mRNA Processing: Modification of pre-mRNA Ends

In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
Translational Regulation01:29

Translational Regulation

Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
Alternative RNA Splicing02:18

Alternative RNA Splicing

Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...

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A Reporter Based Cellular Assay for Monitoring Splicing Efficiency
08:53

A Reporter Based Cellular Assay for Monitoring Splicing Efficiency

Published on: September 15, 2021

Spliceosomal snRNA modifications and their function.

John Karijolich1, Yi-Tao Yu

  • 1Department of Biochemistry and Biophysics, University of Rochester Medical Center, Rochester, NY, USA.

RNA Biology
|March 11, 2010
PubMed
Summary
This summary is machine-generated.

Spliceosomal small nuclear RNAs (snRNAs) undergo crucial 2'-O-methylation and pseudouridylation modifications. These conserved changes are vital for snRNP biogenesis and spliceosome assembly, with both protein-only and RNA-guided mechanisms identified.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Biochemistry

Background:

  • Spliceosomal small nuclear RNAs (snRNAs) are essential components of the spliceosome, the molecular machine responsible for pre-mRNA splicing.
  • These snRNAs are extensively modified with 2 -O-methylation and pseudouridylation, modifications that are conserved across species.
  • These modifications are often found in functionally important regions of snRNAs and play critical roles in spliceosome function.

Purpose of the Study:

  • To investigate the mechanisms and functions of spliceosomal snRNA modifications.
  • To understand the roles of these modifications in snRNP biogenesis and spliceosome assembly.

Main Methods:

  • The study likely involved biochemical and genetic approaches to analyze snRNA modifications.
  • Investigating RNA-independent (protein-only) and RNA-dependent (RNA-guided) modification pathways.

Main Results:

  • Two distinct mechanisms for snRNA modification have been elucidated: RNA-independent (protein-only) and RNA-dependent (RNA-guided).
  • The functional significance of spliceosomal snRNA modifications in snRNP biogenesis and spliceosome assembly has been experimentally verified.

Conclusions:

  • Spliceosomal snRNA modifications are critical for proper spliceosome assembly and function.
  • Understanding these modifications provides insights into the regulation of gene expression and RNA processing.