The poly(A)(+)RNA sequence complexity is also represented in poly(A)(-)RNA in sea-urchin embryos.
The extent to which the poly(A)(+)RNA sequence complexity from sea-urchin embryos is also represented in poly(A)(-)RNA was determined by cDNA cross-hybridization. Eighty percent or more of both the cytoplasmic poly(A)(+)RNA and polysomal poly(A)(+)RNA sequences appeared in a poly(A)(-) form. In both cases, the cellular concentrations of the poly(A)(-)RNA molecules that reacted with the cDNA were similar to the concentrations of the homologous poly(A)(+) sequences. Additionally, few, if any, abundant poly(A)(+)mRNA molecules were quantitatively discriminated by polyadenylation, since the abundant poly(A)(+)sequences were also abundant in poly(A)(-)RNA. Neither degradation nor inefficient binding to oligo (dT)-cellulose can account for the observed cross-reactivity. These data indicate that, in sea-urchin embryos, the poly(A) does not regulate the utilization of mRNA by demarcating an mRNA subset that is specifically and completely polyadenylated.
D000818:Animals; D001483:Base Sequence; D004247:DNA / Q000032:analysis; D004625:Embryo, Nonmammalian / Q000502:physiology; D009693:Nucleic Acid Hybridization; D011061:Poly A / Q000235:genetics*; D012313:RNA / Q000235:genetics*; D012333:RNA, Messenger; D012617:Sea Urchins / Q000196:embryology*
D012333:RNA, Messenger; D011061:Poly A; D012313:RNA; D004247:DNA