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The developmental program controlling the expression of myelin basic protein (MBP) gene was studied in the rat using the technique of in situ hybridization. A 35S-labeled cDNA clone of mouse MBP encoding an amino acid sequence present in all four of the major forms of rodent MBP was used. The probe hybridized to the tracts of white matter with different intensities, depending on the age of the animal and the region of the brain examined. In the medulla oblongata, maximal hybridization was found in 5- and 7-day-old rats and was confined to the tectospinal tracts, fibers of the seventh cranial nerve, and the spinocerebellar tracts. By 12 days the amount of MBP mRNA had decreased in these areas. In the cerebrum, the greatest amount of MBP mRNA was observed in 17-day-old rats in the radiations of the corpus callosum. Thereafter, the levels decreased but could still be observed in the adult animals. Thus, using this technique, we have been able to demonstrate that the level of MBP-specific mRNA correlates closely with the development of myelin in different regions of the brain.

Expression of myelin basic protein gene in the developing rat brain as revealed by in situ hybridization.