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Developmental expression and alternative splicing of chick agrin RNA
W S Thomas1, D K O'Dowd, M A Smith
1Department of Anatomy and Neurobiology, University of California, Irvine 92717.
Developmental Biology
|August 1, 1993
Summary
Agrin, a key protein in synapse development, is expressed in chick ciliary ganglia during embryonic development. Its gene expression and splicing patterns change, supporting its role in peripheral nervous system synaptogenesis.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Agrin is a synaptic basal lamina protein crucial for neuromuscular junction development.
- It is proposed to mediate motor neuron-induced acetylcholine receptor clustering.
- The chick ciliary ganglion is a parasympathetic ganglion with motor neurons projecting to ocular targets.
Purpose of the Study:
- To investigate agrin gene expression in the chick ciliary ganglion during embryonic development.
- To analyze the temporal expression patterns of agrin mRNA.
- To identify alternatively spliced agrin isoforms in this autonomic system.
Main Methods:
- In situ hybridization using antisense agrin cRNA probes.
- Quantitative PCR (competitive PCR) for agrin mRNA levels.
- RNA analysis to detect alternative splicing events.
Main Results:
- Agrin expression was observed in ciliary and choroid neurons, as well as glial cells.
- Hybridization intensity peaked before embryonic Day 15 and declined by hatching.
- Agrin mRNA levels increased significantly between embryonic Days 8 and 10, remaining high until Day 14.
- Four distinct agrin transcripts, resulting from alternative splicing of 8- and 11-amino acid exons, were identified.
Conclusions:
- Agrin is expressed in autonomic motor neurons of the peripheral nervous system.
- Developmentally regulated expression and alternative splicing of agrin support its role in synaptogenesis.
- Agrin's function extends beyond spinal motor neurons, playing a broader role in neural development.