Selective transport of SC1 mRNA, encoding a putative extracellular matrix glycoprotein, during postnatal development of the rat cerebellum and retina
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Published on: September 27, 2020
1Department of Zoology, University of Toronto, Scarborough Campus, 1265 Military Trail, Toronto, Ontario, Canada.
Abstract:
The selective transport of mRNA species into peripheral processes of cells is an important aspect of gene expression in the nervous system. In this study, we report the transport of SC1 mRNA into the distal processes of Bergmann glial (BG) cells at particular stages of development. SC1 is a putative anti-adhesive extracellular matrix (ECM) glycoprotein that is expressed not only in the developing central nervous system (CNS) but also in the adult brain. The intracellular distribution of SC1 mRNA was examined in two highly laminated neural structures, the cerebellum and retina, during postnatal development and in the adult rat. Our results indicate that SC1 mRNA expression is both spatially and temporally regulated. SC1 message was localized to BG cell bodies at postnatal day 5 (P5) and P10. However, by P15 through to the adult, SC1 mRNA was transported to distal processes of BG cells in the synapse-rich molecular layer (ML) of the cerebellum. In the developing rat retina, SC1 mRNA was expressed in specific neuronal populations by P10, however, transport of SC1 message to the dendrites of these retinal neurons was not detected during development or in the adult. These results indicate neural mechanisms which control the timing and cell type in which selective transport of SC1 mRNA is observed. The localization of SC1 mRNA to the distal processes of BG cells in the synapse-rich ML of the cerebellum could facilitate local control of SC1 protein synthesis which may play roles in synapse formation during development and in synaptic plasticity in the adult.
Insights
SC1 mRNA is selectively transported to Bergmann glial cell processes in the cerebellum during development. This transport may regulate SC1 protein synthesis for synapse formation and plasticity.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Selective mRNA transport is crucial for gene expression in the nervous system.
- SC1, an extracellular matrix glycoprotein, is expressed in the developing and adult brain.
- Understanding SC1 mRNA localization provides insights into neural development and function.
Purpose of the Study:
- To investigate the spatial and temporal regulation of SC1 mRNA transport in the developing and adult rat cerebellum and retina.
- To determine the cell types and developmental stages involved in SC1 mRNA localization.
- To explore the potential roles of SC1 mRNA transport in synaptic development and plasticity.
Main Methods:
- In situ hybridization to examine SC1 mRNA distribution in rat cerebellum and retina.
- Analysis of SC1 mRNA localization at different postnatal developmental stages (P5, P10, P15) and in adults.
- Comparison of SC1 mRNA transport in Bergmann glial cells versus retinal neurons.
Main Results:
- SC1 mRNA was found in Bergmann glial cell bodies at P5 and P10, then transported to distal processes by P15 and in adults.
- SC1 mRNA was expressed in specific retinal neurons by P10, but not transported to their dendrites.
- SC1 mRNA expression and transport are spatially and temporally regulated, varying by cell type and brain region.
Conclusions:
- Neural mechanisms control the cell-type-specific and temporal regulation of SC1 mRNA transport.
- SC1 mRNA localization in Bergmann glial distal processes suggests local protein synthesis control.
- This localized synthesis may influence synapse formation during development and synaptic plasticity in adults.
