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Alternative RNA Splicing

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...

Alternative RNA Splicing

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...

RNA Splicing

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 Splicing

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...

Chromatin Structure Regulates pre-mRNA Processing

Chromatin Structure Regulates pre-mRNA Processing

In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
The chromatin structure, especially...

What is Gene Expression?

What is Gene Expression?

A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then processed and...

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Related Experiment Video

Updated: Jul 18, 2026

Using the E1A Minigene Tool to Study mRNA Splicing Changes

Using the E1A Minigene Tool to Study mRNA Splicing Changes

Published on: April 22, 2021

Different levels of alternative splicing among eukaryotes.

Eddo Kim¹, Alon Magen, Gil Ast

¹Department of Human Genetics and Molecular Medicine, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv 69978, Israel.

Nucleic Acids Research

|December 13, 2006

Summary

Alternative splicing, a key mechanism for generating diverse proteins, occurs more frequently in vertebrates than invertebrates. This finding suggests a role for alternative splicing in the evolution of complex phenotypes.

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Area of Science:

Genomics
Molecular Biology
Evolutionary Biology

Background:

Alternative splicing significantly expands the proteome but comparative analyses across species have yielded conflicting results.
Previous studies were limited by expressed sequence tag (EST) coverage variability, hindering accurate cross-species comparisons.

Purpose of the Study:

To compare alternative splicing levels across eight diverse organisms using an EST-independent method.
To investigate the relationship between intron size and alternative splicing, specifically exon skipping and splice site usage.

Main Methods:

Developed and applied an expressed sequence tag (EST)-independent approach for analyzing alternative splicing.
Compared the prevalence of alternative splicing events, including exon skipping and splice site variations, across different species.
Analyzed intron and exon sizes associated with constitutive versus alternatively spliced exons.

Main Results:

Vertebrates exhibit higher percentages of genes and exons undergoing alternative splicing compared to invertebrates.
Alternative skipping exons are associated with longer flanking introns, unlike alternative 5' and 3' splice site events.
Exon skipping is the most prevalent alternative splicing type and increases from invertebrates to vertebrates; intron retention remains rare.

Conclusions:

Alternative splicing levels differ significantly between vertebrates and invertebrates, potentially contributing to vertebrate phenotypic complexity.
The accumulation of introns may provide an evolutionary advantage by enabling greater alternative splicing diversity.
Evolutionary changes in alternative splicing regulation and intron-exon sizes have occurred throughout metazoan evolution.