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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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Structure-function Studies in Mouse Embryonic Stem Cells Using Recombinase-mediated Cassette Exchange
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Scrambled exons.

J M Nigro1, K R Cho, E R Fearon

  • 1Oncology Center, Johns Hopkins University School of Medicine, Baltimore, Maryland 21231.

Cell
|February 8, 1991
PubMed
Summary
This summary is machine-generated.

Researchers discovered scrambled RNA transcripts where gene exons are out of order during splicing. This novel RNA product formation challenges traditional understanding of gene expression and RNA processing.

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Splicing

Background:

  • Alternative RNA splicing is a key mechanism for generating protein diversity.
  • The precise order of exon joining during splicing is crucial for producing functional transcripts.
  • The candidate tumor suppressor gene DCC is implicated in cellular growth and development.

Purpose of the Study:

  • To investigate the occurrence and nature of aberrant RNA splicing events.
  • To identify novel RNA products resulting from non-sequential exon joining.
  • To understand the implications of scrambled transcripts in normal and neoplastic cells.

Main Methods:

  • Sensitive RNA expression assays were employed to detect unusual transcripts.
  • Polymerase Chain Reaction (PCR) amplification was used to isolate specific RNA segments.
  • Cloning and sequencing techniques were utilized to determine the exact structure of aberrant transcripts.

Main Results:

  • Several abnormally spliced transcripts of the DCC gene were identified.
  • Exons within these transcripts were joined accurately at splice sites but in a scrambled order.
  • Four distinct types of scrambled transcripts were characterized, each involving different exon pairs.
  • Scrambled transcripts were detected at low levels in various normal and cancerous cells, predominantly in nonpolyadenylated cytoplasmic RNA.

Conclusions:

  • The splicing machinery can join exons in a non-sequential order, deviating from the genomic DNA arrangement.
  • This process generates novel RNA products with potentially altered functions.
  • The findings reveal a previously unrecognized mechanism of RNA processing with implications for gene expression regulation.