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. 1981 Apr 15;196(1):327–336. doi: 10.1042/bj1960327

Developmental changes in the composition of polyadenylated RNA isolated from free and membrane-bound polyribosomes of the rat forebrain, analysed by translation in vitro.

C Hall, L Lim
PMCID: PMC1162997  PMID: 6171267

Abstract

Free and membrane-bound polyribosomes were isolated from the rat forebrain during its development. Polyadenylated RNA [poly(A)+ RNA] was isolated from both fractions, by using oligo(dT)-cellulose chromatography, and its composition studied by translating the poly(A)+ RNA in vitro in reticulocyte lysates. Electrophoretic analysis of the translation products showed that both free and membrane-bound polyribosomal poly(A)+ RNA gave many common components, but that there were also distinct differences in the protein composition of the products of the two fractions. Several proteins, of mol.wts. 39 000, 37 000, 31 000, 27 000 and 17 000, appeared to be products predominantly of free polyribosomal poly(A)+ RNA, whereas others, of mol.wt. 47 000, 33 000, 24 000 and 21 000 were specific to the membrane-bound polyribosomal poly(A)+ RNA fraction. More developmental changes were observed in the translational products of the membrane-bound poly(A)+ RNA fraction. Proteins of mol.wts. 33 000 and 21 000, which were predominant components of the translational products of this fraction when isolated from 10-day and older rats, were not present in translational products derived from preparations isolated from 3-day-old rats. The developmental appearance of these proteins as translational products of the membrane-bound poly(A)+ RNA suggests the appearance of new mRNA species. These transcriptional changes are discussed in relation to processes involved in brain differentiation, including myelination.

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