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RNA Splicing01:32

RNA Splicing

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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...
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Pre-mRNA Processing: RNA Splicing01:36

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Alternative RNA Splicing02:18

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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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Alternative RNA Splicing02:18

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The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
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Related Experiment Video

Updated: Dec 6, 2025

ACT1-CUP1 Assays Determine the Substrate-Specific Sensitivities of Spliceosomal Mutants in Budding Yeast
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ACT1-CUP1 Assays Determine the Substrate-Specific Sensitivities of Spliceosomal Mutants in Budding Yeast

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Spliceosomal Introns: Features, Functions, and Evolution.

I V Poverennaya1,2, M A Roytberg2,3,4

  • 1Vavilov Institute of General Genetics, Russian Academy of Sciences, 119991, Moscow, Russia. ipoverennaya@gmail.com.

Biochemistry. Biokhimiia
|October 12, 2020
PubMed
Summary
This summary is machine-generated.

This review explores spliceosomal introns, their origins, and evolutionary dynamics. It details intron functions and how their features impact gene regulation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Evolutionary Biology

Background:

  • Spliceosomal introns are non-coding sequences in eukaryotic pre-mRNAs, removed by the spliceosome.
  • Introns are present in various gene regions and exhibit high polymorphism, historically linking them mainly to alternative splicing.
  • Intron evolution was often considered part of gene structure evolution rather than individual element evolution.

Purpose of the Study:

  • To review theories on intron origin.
  • To discuss evolutionary events like intron gain, loss, and sliding.
  • To explore known intron functions and their regulatory mechanisms.

Main Methods:

  • Literature review of intron origin theories.
  • Analysis of evolutionary events in exon-intron structure.
  • Compilation of known intron functions and regulatory impacts.

Main Results:

  • Intron functions extend beyond alternative splicing.
  • Intron gain, loss, and sliding are key evolutionary events.
  • Intron length and phase variations influence gene regulation.

Conclusions:

  • Introns are dynamic genomic elements with diverse functions.
  • Understanding intron evolution provides insights into gene regulation.
  • Intron features significantly impact gene-mediated processes.