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Developmental expression of myelin basic protein mRNA in a hypermyelinating mouse
Abstract:
Polysomal poly (A)+ RNA and total cellular RNA were isolated from the brains of C57BL/6J (B6), DBA/2J (D2), and F1 hybrid mice. Both types of RNA were isolated at 9, 12, 16, 21, and 30 days of age. By using a 32P-labelled cDNA probe for myelin basic protein (MBP; pMBP-1) the amounts of RNA coding for MBP present in the three strains at each age were determined. For both the polysomal poly(A)+ and total cellular RNA the peak of MBP RNA accumulation was at about 16-18 days for all three strains. These results imply that the developmental pattern of MBP RNA synthesis for F1 mice is not shifted with respect to the parental strains. For the polysomal poly(A)+ RNA, F1 had the greatest amount of MBP mRNA, B6 the least, and D2 an intermediate amount. F1 again had the greatest amount of MBP RNA from the total cellular pool at all ages. However, B6 had a greater amount of MBP RNA in the total cellular RNA pool than did D2. This demonstrates elevated transcription of the MBP gene in the F1 or an increase in message stability in this strain. It also suggests some form of translational control for MBP RNA in the B6 strain. In addition a second species of MBP RNA was found in the total cellular RNA pool. This species is larger than the major polysomal RNA band and may be a nuclear precursor.
Insights
Myelin basic protein (MBP) RNA accumulation peaks around 16-18 days in mice. Hybrid mice show higher MBP RNA levels, suggesting transcriptional or stability differences, while B6 mice may exhibit translational control.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Myelin basic protein (MBP) is crucial for myelin sheath formation in the central nervous system.
- Gene expression regulation during development is critical for proper neurological function.
Purpose of the Study:
- To investigate the developmental expression patterns of myelin basic protein (MBP) RNA in different mouse strains.
- To compare MBP RNA levels in polysomal poly(A)+ RNA and total cellular RNA across C57BL/6J, DBA/2J, and F1 hybrid mice at various developmental stages.
Main Methods:
- Isolation of polysomal poly(A)+ RNA and total cellular RNA from mouse brains at ages 9, 12, 16, 21, and 30 days.
- Quantification of MBP RNA using a 32P-labelled cDNA probe (pMBP-1).
- Analysis of MBP RNA accumulation and distribution in different cellular fractions.
Main Results:
- MBP RNA accumulation peaked around 16-18 days of age in all three mouse strains.
- F1 hybrid mice exhibited the highest levels of MBP mRNA in both polysomal poly(A)+ and total cellular RNA pools.
- B6 mice showed the lowest levels of polysomal MBP mRNA but higher total cellular MBP RNA compared to D2 mice, suggesting strain-specific regulatory mechanisms.
Conclusions:
- The developmental timing of MBP RNA synthesis is conserved across the studied mouse strains.
- F1 hybrid mice demonstrate elevated MBP gene transcription or increased message stability.
- Strain-specific differences in MBP RNA levels suggest the involvement of translational control mechanisms, particularly in the B6 strain.