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Related Concept Videos

Alternative RNA Splicing02:18

Alternative RNA Splicing

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.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Alternative RNA Splicing02:18

Alternative RNA Splicing

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.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
RNA Splicing01:32

RNA Splicing

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...
RNA Splicing01:32

RNA Splicing

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...
Pre-mRNA Processing: RNA Splicing01:32

Pre-mRNA Processing: RNA Splicing

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...
Termination of Translation01:44

Termination of Translation

The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...

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Using the E1A Minigene Tool to Study mRNA Splicing Changes
10:25

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A splicer that represses (translation).

Robin P Wharton1

  • 1Department of Molecular Genetics and Microbiology, Duke University, Durham, North Carolina 27710, USA. rwharton@duke.edu

Genes & Development
|January 28, 2009
PubMed
Summary
This summary is machine-generated.

Polypyrimidine tract-binding protein (PTB) represses oskar mRNA in the cytoplasm of Drosophila oocytes. This finding challenges the notion that all cytoplasmic mRNA regulation originates in the nucleus.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Genetics

Background:

  • Maternal mRNA regulation is crucial for establishing the antero-posterior axis in Drosophila oocytes.
  • Polypyrimidine tract-binding protein (PTB) is primarily known as a nuclear regulator of alternative splicing.

Purpose of the Study:

  • To investigate the role of PTB in the cytoplasm during early Drosophila development.
  • To determine if PTB's function in cytoplasmic mRNA repression requires nuclear engagement.

Main Methods:

  • Utilized genetic analysis in Drosophila melanogaster.
  • Investigated the localization and function of PTB in relation to oskar mRNA.
  • Performed experiments to assess mRNA repression in the cytoplasm.

Main Results:

  • Polypyrimidine tract-binding protein (PTB) is essential for repressing oskar mRNA in the cytoplasm.
  • PTB can repress oskar mRNA without prior nuclear interaction.
  • This demonstrates a novel cytoplasmic function for PTB.

Conclusions:

  • PTB plays a critical role in cytoplasmic mRNA regulation, specifically repressing oskar mRNA.
  • The study provides evidence against the universal model that cytoplasmic mRNA regulation is initiated in the nucleus.
  • This work expands our understanding of post-transcriptional gene regulation in development.