Mrna Splicing
Mrna Splicing - Related Videos
02:18
Alternative RNA Splicing
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2020
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...
01:32
Pre-mRNA Processing: RNA Splicing
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2023
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...
10:25
Using the E1A Minigene Tool to Study mRNA Splicing Changes
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Cited by 3 •
2021
This protocol presents a rapid and useful tool for evaluating the role of a protein with uncharacterized function in alternative splicing regulation after chemotherapeutic treatment.
01:32
RNA Splicing
0 Views •
2019
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...
02:31
Nuclear Export of mRNA
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2020
Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
FAQs
The spliceosome uses conserved sequences at intron boundaries as positional signals for selecting where processing occurs. Its small nuclear RNAs and proteins form the molecular complex that recognizes those signals and catalyzes two transesterification reactions. This coordination matters because it converts sequence recognition into a precise RNA rearrangement, preserving accurate exon joining during gene expression.
The two transesterification reactions provide the chemical basis for the spliceosome’s precise RNA rearrangement. Rather than merely removing an intron, the process coordinates intron removal with exon joining, producing a mature transcript that can proceed through gene expression. Their inclusion explains how recognition at the boundaries is converted into an accurately processed RNA molecule.
Conserved sequences at intron boundaries act as recognition signals for the spliceosome. By identifying these locations, the complex can target the correct regions of the primary transcript before catalysis begins. This targeting is essential for precise RNA rearrangement, because accurate boundary recognition determines which intron is removed and which coding exons remain in the mature messenger RNA.
Once processing has produced mature mRNA in the nucleus, the transcript can leave the nucleus and enter the cytoplasm. There, it guides protein synthesis. This progression links an RNA-processing event inside the nucleus to the production of proteins in the cytoplasm, showing how gene expression is distributed across cellular compartments.
Alternative splicing allows one gene to generate multiple mRNA variants, which can in turn produce multiple protein variants. This expands biological diversity without requiring each protein form to originate from a separate gene. The resulting variation can influence development and cellular function, making splicing an important layer of gene regulation.
Researchers study mRNA splicing to connect gene regulation with genetic disorders. Because splicing determines the mature messenger RNA available for protein synthesis, the different RNA and protein variants produced through alternative splicing provide important biological context. This perspective helps relate RNA processing to cellular function, development, and disease.