title: New U1 RNA species found in Friend SFFV (spleen focus forming virus)-transformed mouse cells.
abstract: The U1 RNA species in 10 mouse cell lines were examined by two-dimensional polyacrylamide gel electrophoresis. Seven cell lines that were not infected by Friend spleen focus forming virus gave only one (I) or two (I and II) U1 RNA-containing spots. However, two Friend cell lines (FVTCT and Friend 745a cells) gave three spots (I, II, and III) and another Friend cell line, K-1 cells, gave four spots (I, II, III, and IV). As a result of further separation and fingerprinting analysis of each spot, FVTCT and Friend 745a cells were found to contain U1a-1, U1b-1, -2, and -6 RNAs whereas K-1 cells were found to contain several U1 RNAs, which we call U1a-1 and -2, U1b-4, -5, and -6 RNAs. We determined the sequences of these seven U1 RNAs and found that mouse U1 RNAs had two basic sequences (U1a and -b). The nucleotide sequence of U1a-1 RNA was identical to that of rat U1a RNA, while U1a-2 RNA was one base different from U1a-1 RNA. Relative to U1a-1 RNA all of the U1b RNAs had five base substitutions and one additional base and were under-methylated in the center. U1b-6 RNA contained two base substitutions and one base addition in the 3'-terminal portion of U1b-1 RNA. U1b-2, -4, and -5 RNAs, which were observed only in Friend cells, each had an additional base substitution in the 5'-half of U1b-1 RNA.
authors.forename: N
authors.initials: N
authors.lastname: Kato
authors.forename: F
authors.initials: F
authors.lastname: Harada
mesh_terms: D000818:Animals; D001483:Base Sequence; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D004622:Embryo, Mammalian; D005622:Friend murine leukemia virus / Q000235:genetics*; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008811:Mice, Inbred DBA; D008815:Mice, Inbred Strains; D009690:Nucleic Acid Conformation; D012313:RNA / Q000302:isolation & purification*; D012342:RNA, Small Nuclear; D012367:RNA, Viral / Q000302:isolation & purification*; D006163:Ribonuclease T1; D013045:Species Specificity
chemical_list: D012342:RNA, Small Nuclear; D012367:RNA, Viral; D012313:RNA; D006163:Ribonuclease T1