title: The heterogeneous nuclear RNA of chicken erythroblasts.
abstract: Heterogeneous nuclear RNA (hnRNA) from chicken erythroblasts has a modal molecular weight of 1.6 -10(6) in 99% dimethylsulfoxide. When erythroblasts are labeled continuously with [14C]uridine, nuclear RNA is labeled as a single kinetic component with a half-life of 18 min. After a 10--20 min lag, label appears in cytoplasmic RNA at about 1% of the initial rate of total RNA synthesis. Of the hnRNA sedimenting faster than 28 S ribosomal RNA in both an aqueous sucrose gradient and a subsequent fructose gradient in 99% dimethylsulfoxide, about one-third is polyadenylated, although only about one in 2000 (i.e. about four molecules per cell) contain a globin messenger sequence. The hnRNA of erythroblasts isolated from 5.7- and 11-day chick embryos have the same content of globin messenger sequences as erythroblaasts from anemic adults.
mesh_terms: D000740:Anemia / Q000097:blood; D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism*; D002499:Centrifugation, Density Gradient; D002645:Chickens; D004900:Erythroblasts / Q000378:metabolism*; D004912:Erythrocytes / Q000378:metabolism*; D005914:Globins / Q000096:biosynthesis; D007700:Kinetics; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D014176:Protein Biosynthesis; D012313:RNA / Q000097:blood; D012333:RNA, Messenger / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; D012313:RNA; D005914:Globins