Abstract
1. The structure and function of glutamate receptor subunits GluR2, GluR5, and GluR6 are changed by RNA editing. This reaction produces a base transition in the second transmembrane spanning region. The triplet CAG (coding for glutamine) is changed to CGG (coding for arginine). This transition has a pronounced effect on calcium fluxes through the respective ion channels, because calcium currents decrease with the rate of editing. 2. In the present study the extent of RNA editing of the glutamate receptor subunit GluR5 was studied in different brain regions of control rats using a newly developed analysis system. This system is based on restriction analysis of the polymerase chain reaction (PCR) product, derived from reverse-transcribed mRNA as template, with the enzyme Bbv1. Bbv1 recognizes the sequence of the nonedited receptor subunit around the edited base (sequence GCAGC) but not that of the edited subunit (sequence GCGGC; A edited to G). 3. Total RNA was isolated from the cerebral cortex, striatum, hippocampus, thalamus, hypothalamus, cerebellum, pons/medulla oblongata, and white matter and reverse transcribed into cDNA. The region across the edited sequence was amplified by PCR using GluR5-specific primers and the cDNA as...Continue Reading
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