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Messenger RNA content and complexity of euthyroid and hypothyroid rat liver.

The poly(A)-containing RNA of euthyroid and hypo- thyroid rat liver has been compared with respect to its intracellular concentration and sequence complexity. Content of poly(A)-containing RNA was determined by isolating total cytoplasmic RNA and hybridizing an aliquot of this RNA to an excess of [3H]poly(dT) to determine the amount of poly(A) present. Levels of total cytoplasmic RNA and poly(A)-containing RNA, expressed per mg of DNA, were approximately 1.5-fold higher in euthyroid livers than in hypothyroid livers. To assess the nature of this additional mRNA, poly(A)- containing RNA was isolated from both euthyroid and hypothyroid livers. These two RNA populations showed no significant difference with respect to size distribution on sucrose gradient centrifugation. Complementary DNA populations were synthesized from each poly(A)-containing RNA preparation. Analysis of the kinetics of hybridization of these cDNA populations with their respective RNA templates revealed a com- plex pattern which be most simply described frequency components.