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Related Concept Videos

RNA Splicing01:32

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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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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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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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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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Using the E1A Minigene Tool to Study mRNA Splicing Changes
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Alternative splicing impacts microRNA regulation within coding regions.

Lena Maria Hackl1, Amit Fenn1,2, Zakaria Louadi1,2

  • 1Institute for Computational Systems Biology, University of Hamburg, Notkestrasse 9, 22607 Hamburg, Germany.

NAR Genomics and Bioinformatics
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Summary

Alternative splicing impacts microRNA (miRNA) regulation by potentially removing miRNA target sites from messenger RNA (mRNA). This study confirms that transcripts with coding region target sites are more effectively regulated by miRNAs.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Bioinformatics

Background:

  • MicroRNAs (miRNAs) are key regulators of post-transcriptional gene expression.
  • Alternative splicing generates transcript diversity, potentially affecting miRNA binding.
  • Understanding miRNA-target interactions is crucial in diseases like cancer and Parkinson's.

Purpose of the Study:

  • To investigate how alternative splicing influences miRNA regulation of gene expression.
  • To determine the role of miRNA target sites in both coding and non-coding regions.
  • To analyze miRNA regulation in cancer and Parkinson's disease datasets.

Main Methods:

  • Predicted miRNA target sites on mRNAs using TarPmiR.
  • Trained linear regression models to predict miRNA expression from transcript expression.
  • Compared predictive models using transcripts with and without coding region miRNA target sites.

Main Results:

  • Models incorporating transcripts with miRNA target sites in coding regions showed significantly higher predictive power.
  • Evidence suggests alternative splicing can disrupt miRNA binding by excluding exons containing target sites.
  • This regulatory interference was observed in both cancer and Parkinson's disease data.

Conclusions:

  • Alternative splicing interferes with miRNA-mediated gene regulation.
  • Exon skipping due to alternative splicing can render transcripts unresponsive to miRNA control.
  • MiRNA target site location within coding regions is critical for effective post-transcriptional regulation.