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. 1987 Mar;7(3):965–972. doi: 10.1128/mcb.7.3.965

Translational control of ribosomal protein synthesis during early Dictyostelium discoideum development.

L F Steel, A Jacobson
PMCID: PMC365165  PMID: 2882416

Abstract

Throughout the developmental program of Dictyostelium discoideum there are substantial changes in the rates of both ribosome utilization and rRNA transcription and processing. We examined the regulation of ribosomal protein (r-protein) gene expression and found that, at the start of development, expression of these genes was drastically and specifically reduced by a block to translational initiation. An apparently separate event signals a sudden decrease in the relative amount of r-protein mRNA at about 10 h of development, a time when aggregated amoebae are forming tight cell-cell contacts. For the first 9 h of development, the relative amount of r-protein mRNA remained essentially unchanged and comparable to levels detected in growing cells. While the r-protein mRNAs were almost fully loaded on polysomes during vegetative growth, they were specifically excluded from polysomes at the start of development. The translational block was not the result of irreversible structural changes which inactivate the r-protein mRNAs since they remained translatable both in vitro, in wheat germ extracts, and in vivo, where they were recruited onto polysomes in the presence of the elongation inhibitor cycloheximide. In addition, precise measurements of poly(A) tail lengths on individual hybrid-selected mRNA species showed that there is no difference in the poly(A) tail length of r-protein mRNA isolated from growing cells and 1-h developing cells. Therefore, changes in translational efficiency cannot be attributed to cleavage of poly(A) tails.

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