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Related Concept Videos

Alternative RNA Splicing02:18

Alternative RNA Splicing

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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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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...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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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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Alternative splicing controls pan-neuronal homeobox gene expression.

Eduardo Leyva-Díaz1,2, Michael Cesar3, Karinna Pe3

  • 1Howard Hughes Medical Institute, Department of Biological Sciences, Columbia University, New York, New York 10025, USA; eleyva@umh.es.

Genes & Development
|December 27, 2024
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Summary

The study reveals how the UNC-75/CELF splicing factor directs pan-neuronal expression of the CEH-44/CUX gene in C. elegans neurons. This process ensures neuronal identity and excludes a Golgi protein from the nervous system.

Keywords:
C. elegansalternative splicinghomeoboxneuronal cell fatepan-neuronal gene expression

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Area of Science:

  • Developmental Biology
  • Neuroscience
  • Molecular Biology

Background:

  • The CUT homeobox gene CEH-44/CUX is crucial for pan-neuronal gene expression in C. elegans.
  • CEH-44/CUX and the Golgi-localized protein CONE-1/CASP are encoded by a complex locus.
  • Regulation of this complex locus for pan-neuronal expression is not well understood.

Purpose of the Study:

  • To investigate the regulatory mechanisms controlling pan-neuronal expression of CEH-44/CUX in C. elegans.
  • To elucidate how alternative splicing directs gene expression within the nervous system.
  • To understand the cellular specificity of Golgi apparatus composition.

Main Methods:

  • Utilized RNA splicing factor UNC-75, the C. elegans homolog of vertebrate CELF proteins.
  • Analyzed the cone-1&ceh-44 locus during embryogenesis and neuronal differentiation.
  • Investigated the spatial specificities of golgin proteins.

Main Results:

  • Pan-neuronal expression of CEH-44/CUX is controlled by the RNA splicing factor UNC-75/CELF.
  • During embryogenesis, only CONE-1/CASP is produced in all tissues.
  • Postmitotic neurons specifically produce CEH-44/CUX via UNC-75/CELF-mediated alternative splicing, excluding CONE-1/CASP.

Conclusions:

  • UNC-75/CELF-mediated alternative splicing directs pan-neuronal gene expression and establishes neuronal identity.
  • This splicing mechanism excludes a conserved golgin from the nervous system.
  • Findings reveal novel insights into neuronal development and Golgi apparatus specificity.