title: Presence of a putative 15S precursor to beta-globin mRNA but not to alpha-globin mRNA in Friend cells.
abstract: Dimethyl sulfoxide-induced Friend cells were labeled for periods of 5-60 min. The denatured RNA was fractionated by sucrose gradient centrifugation and the distribution of alpha- and beta-globin-specific [(3)H]RNA was determined by hybridization to hybrid plasmids containing mouse alpha- and beta-globin DNA, respectively. After 5 min of labeling, a 15S peak of beta-globin-specific (but not alpha-globin-specific) [(3)H]RNA was detected, next to an equal amount of 10S beta-globin [(3)H]RNA. With increasing periods of labeling, the amount of 15S beta-globin [(3)H]RNA remained constant but the amount 10S beta-globin [(3)H]RNA increased steadily. alpha-Globin-specific [(3)H]RNA sedimented at 11 S after 5 min of labeling and at 9.5 S after longer labeling periods. Analysis of 15S globin-specific [(3)H]RNA purified by the poly(dC)-cDNA method [Curtis, P. J. & Weissmann, C. (1976) J. Mol. Biol. 106, 1061-1075] showed oligonucleotides characteristic of beta-globin mRNA but not of alpha-globin mRNA, as well as about 20 new oligonucleotides. Our results suggest that 10S beta-globin mRNA arises via a 15S precursor that has a half-life of 5 min or less; 9.5S alpha-globin mRNA may be derived from an 11S precursor.
mesh_terms: D000818:Animals; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D005622:Friend murine leukemia virus; D005914:Globins / Q000096:biosynthesis*; D007700:Kinetics; D007942:Leukemia, Experimental / Q000378:metabolism; D051379:Mice; D008970:Molecular Weight; D009693:Nucleic Acid Hybridization; D009843:Oligoribonucleotides / Q000032:analysis; D012333:RNA, Messenger / Q000302:isolation & purification / Q000378:metabolism; D006163:Ribonuclease T1; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D009843:Oligoribonucleotides; D012333:RNA, Messenger; D005914:Globins; D006163:Ribonuclease T1; D004121:Dimethyl Sulfoxide