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Nested transcripts of gap junction gene have distinct expression patterns.

Z Zhang1, K D Curtin, Y A Sun

  • 1Department of Molecular, Cellular and Developmental Biology, 610 KBT, Yale University, P.O. Box 208103, New Haven, Connecticut 06520, USA.

Journal of Neurobiology
|August 10, 1999
PubMed
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The shaking B locus (shakB) in Drosophila encodes gap junction proteins. This study identifies five complex shakB transcripts, with specific ones essential for the giant fiber system

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Genetics

Background:

  • The shaking B locus (shakB) in Drosophila encodes structural components of gap junctions.
  • Gap junctions are crucial for electrical synapse function in the nervous system.
  • Previous studies indicated shakB's role in the giant fiber system (GFS), essential for escape behavior.

Purpose of the Study:

  • To characterize the complex transcript set of the shakB locus.
  • To determine the specific shakB transcripts expressed in the Drosophila giant fiber system (GFS).
  • To correlate shakB transcript expression patterns with GFS function and behavioral defects.

Main Methods:

  • Analysis of the genomic organization and transcript structure of the shakB locus.
  • RNA in situ hybridization to determine tissue-specific and developmental expression patterns of shakB transcripts.

Related Experiment Videos

  • Neurophysiological and behavioral analysis of shakB mutants.

    • Main Results:

    • Five distinct shakB transcripts were identified, sharing 3' exons but differing in 5' exons.
    • Transcripts exhibit diverse expression patterns across neural and non-neural tissues, with developmental regulation.
    • shakB(N3) and potentially shakB(N4) are specifically expressed in the GFS, explaining GFS dysfunction in mutants; shakB(N1) and shakB(N2) are localized to the optic lamina.

    Conclusions:

    • The shakB locus produces a complex array of transcripts with distinct expression profiles.
    • Specific shakB transcripts, particularly shakB(N3), are essential for the proper function of GFS electrical synapses.
    • The identified expression patterns of shakB transcripts provide a molecular basis for observed neurophysiological and behavioral deficits in shakB mutants.