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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.
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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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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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Identification of Alternative Splicing and Polyadenylation in RNA-seq Data
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Rbm3 deficiency leads to transcriptome-wide splicing alterations.

Steffen Erkelenz1, Marta Grzonka1, Antonios Papadakis1

  • 1Faculty of Medicine, University of Cologne, Cluster of Excellence on Cellular Stress Responses in Aging-associated Diseases (CECAD), University Hospital of Cologne, Köln, Germany.

RNA Biology
|October 10, 2024
PubMed
Summary

RNA-binding motif protein 3 (Rbm3) deficiency alters RNA splicing. Restoring Rbm3 expression reverses these changes, revealing its role in maintaining transcriptome integrity.

Keywords:
RNA-seqRbm3isoform switchsplicingtranscriptional fidelity

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Area of Science:

  • Molecular Biology
  • Gene Expression Regulation

Background:

  • RNA-binding motif protein 3 (Rbm3) is a stress-responsive gene involved in cellular homeostasis.
  • Rbm3 shares similarities with heterogeneous nuclear ribonucleoproteins (hnRNPs), key regulators of mRNA metabolism.
  • Emerging evidence suggests Rbm3 plays a broader role in gene expression.

Purpose of the Study:

  • To investigate the role of Rbm3 in pre-mRNA splicing.
  • To determine if Rbm3 deficiency causes transcriptome-wide splicing alterations.
  • To elucidate the mechanism by which Rbm3 influences splice site selection.

Main Methods:

  • Analysis of transcriptome-wide pre-mRNA splicing alterations in Rbm3-deficient cells.
  • MS2 tethering assays to study Rbm3's effect on splice site selection.
  • Investigating the role of Rbm3's N-terminal RNA recognition motif (RRM) domain.

Main Results:

  • Rbm3 deficiency leads to significant, transcriptome-wide alterations in pre-mRNA splicing.
  • These splicing changes are reversible upon Rbm3 co-expression.
  • Rbm3 functions similarly to hnRNPs in regulating splice site selection when recruited to specific RNA regions.
  • The RRM domain of Rbm3 is sufficient to mediate splice site selection changes.

Conclusions:

  • Rbm3 plays a critical, previously undescribed role in RNA splicing.
  • Rbm3 contributes to preserving transcriptome integrity by regulating splicing.
  • These findings expand the known functions of Rbm3 in gene expression regulation.