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Related Experiment Videos

A cDNA clone encoding neuropeptides isolated from Aplysia neuron L11.

R Taussig, R R Kaldany, R H Scheller

    Proceedings of the National Academy of Sciences of the United States of America
    |August 1, 1984
    PubMed
    Summary

    Neurons can release multiple signaling molecules, like classical transmitters and neuroactive peptides. This study identifies a precursor for peptides co-released by the identified L11 neuron in Aplysia, advancing our understanding of cotransmission.

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    Area of Science:

    • Neuroscience
    • Molecular Biology
    • Cell Biology

    Background:

    • Single neurons can utilize multiple neurotransmitters, including classical transmitters and neuroactive peptides, for intercellular communication.
    • The coexistence and corelease of these signaling molecules within the same neuron and potentially the same vesicle present complex regulatory mechanisms.
    • The precise organization and physiological significance of these multiple message systems remain poorly understood in neuroscience.

    Purpose of the Study:

    • To investigate the molecular basis of cotransmission in identified neurons of the Aplysia abdominal ganglion.
    • To isolate and characterize the gene encoding the precursor for secreted peptides in the cholinergic L11 neuron.
    • To understand the genetic organization and expression of cotransmitter systems in Aplysia.

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    Main Methods:

    • Differential screening with labeled cDNA was employed to identify specific gene expression patterns.
    • cDNA clones were isolated from the abdominal ganglion neurons L11 and R15, as well as bag cells.
    • Sequence analysis was performed on an L11-specific clone to identify the encoded protein precursor.

    Main Results:

    • A cDNA clone specific to the L11 neuron was identified, encoding a 14.7-kDa protein precursor.
    • The messenger RNA (mRNA) transcript for this precursor is approximately 1.2 kilobases in length.
    • The gene for this precursor exists in 1-3 copies within the Aplysia haploid genome.

    Conclusions:

    • The identified 14.7-kDa protein serves as the precursor for secreted peptides in the L11 neuron.
    • This finding provides molecular insight into the synthesis and potential corelease of multiple signaling substances by a single neuron.
    • The study contributes to understanding the genetic basis of neuronal cotransmission in Aplysia.