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Pre-mRNA Processing: RNA Splicing01:36

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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.
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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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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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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.
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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Using the E1A Minigene Tool to Study mRNA Splicing Changes
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Viral Modulation of Host Splicing.

Bridget E Begg1, Max B Ferretti1, Matthew A Tracey1,2

  • 1Department of Biochemistry and Biophysics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;

Annual Review of Virology
|April 25, 2025
PubMed
Summary
This summary is machine-generated.

Viruses can alter host gene splicing, impacting host-viral interactions. Recent research highlights how viral infections modify host splicing, a key area for understanding viral pathogenesis and developing new therapies.

Keywords:
SR proteinsalternative splicinghnRNPhost splicingsnRNPviral infection

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Precursor messenger RNA (pre-mRNA) splicing is crucial for gene expression.
  • Early research on splicing focused on viral genes during infection.
  • Recent studies reveal viruses significantly impact host gene splicing.

Purpose of the Study:

  • To review the recent surge in research on viral modulation of host gene splicing.
  • To explore the functional consequences of altered host splicing during viral infections.
  • To identify key questions driving current research in this field.

Main Methods:

  • Literature review of studies investigating host splicing changes during viral infection.
  • Analysis of the functional outcomes of virus-induced splicing alterations.
  • Synthesis of current research trends and future directions.

Main Results:

  • Viral infections extensively reprogram host pre-mRNA splicing patterns.
  • Altered host splicing affects viral replication and host immune responses.
  • This regulation is a critical component of the host-viral interplay.

Conclusions:

  • Understanding virus-mediated host splicing is vital for comprehending viral pathogenesis.
  • Targeting host splicing represents a potential therapeutic strategy against viral infections.
  • Further research is needed to fully elucidate the complexities of host splicing regulation by viruses.