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Developmental regulation of myelin basic protein expression in mouse brain
Abstract:
Developmental regulation of myelin basic protein expression in mouse brain has been examined by comparing the myelin basic protein coding potential of mRNA in vitro with the accumulation of myelin basic protein-related polypeptides in vivo. In vitro translation of mRNA isolated from mouse brain generated eight myelin basic protein-related polypeptides with apparent molecular weights of 34K, 30K, 29K, 26K, 21.5K, 18.5K, 17K, and 14K. A similar set of eight myelin basic protein-related polypeptides with corresponding molecular weights was identified in vivo when total brain proteins were analyzed by immunoblotting. Each of the myelin basic protein-related polypeptides shows a characteristic developmental profile in terms of mRNA level and rate of accumulation implying a complex developmental program of myelin basic protein gene expression with regulation and modulation at several different biosynthetic levels.
Insights
This study reveals that myelin basic protein (MBP) gene expression in the mouse brain is complex, with multiple regulatory levels controlling the production of various MBP-related proteins during development.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Myelin basic protein (MBP) is crucial for central nervous system myelination.
- Understanding the developmental regulation of MBP expression is key to comprehending myelin formation.
Purpose of the Study:
- To investigate the developmental regulation of myelin basic protein (MBP) expression in the mouse brain.
- To compare the in vitro translation of MBP mRNA with in vivo protein accumulation.
Main Methods:
- In vitro translation of mRNA isolated from mouse brain.
- Analysis of total brain proteins using immunoblotting.
Main Results:
- Eight distinct MBP-related polypeptides were identified in vitro, with molecular weights ranging from 14K to 34K.
- A similar set of eight MBP-related polypeptides was detected in vivo.
- Each polypeptide exhibited a unique developmental profile concerning mRNA levels and accumulation rates.
Conclusions:
- Mouse brain MBP gene expression involves a complex developmental program.
- Regulation and modulation occur at multiple biosynthetic levels during development.