Stability of GABAA/benzodiazepine receptor alpha 1 subunit mRNA expression in reeler mouse cerebellar Purkinje cells during postnatal development.

A [35S]cRNA probe was used for the visualization of GABAA/benzodiazepine (GABAA/BZ) receptor alpha 1 subunit mRNA in developing reeler mutant mouse cerebellum. A clear hybridization signal was observed throughout the malformed reeler cerebellum from birth. Labeling was associated with Purkinje cell bodies located in three subcortical masses. Additional labeled Purkinje cells were observed within the granule cell layer and at their normal position at the interface between the molecular and granule cell layers. All reeler Purkinje cells had comparable levels of grain density, regardless of their location within the cerebellar cortex. These results indicate that Purkinje cell malpositioning, and the resulting absence of a major complement of afferents throughout development, does not impair the expression of mRNA coding for the alpha 1 subunit of the GABAA/BZ receptor.