title: Complexity of poly(A+) and poly(A-) polysomal RNA in mouse liver and cultured mouse fibroblasts.
abstract: RNA excess hybridization experiments were used to measure the complexity of nuclear RNA, poly(A+) mRNA, poly(A-) mRNA, and EDTA-released polysomal RNA sedimenting at less than 80 S in mouse liver and in cultured mouse cells. With both cell types, poly(A-) RNA was found to contain 30-40% of the sequence diversity of total mRNA. In the case of liver this represents 5,700 poly(A-) molecules and 8,600 poly(A+) molecules for a total of approximately 14,300 different mRNAs. Comparison of the complexity of mRNA with that of nuclear RNA revealed that in liver and in cultured cells, mRNA has only 10-20% of the sequence diversity present in nuclear RNA. This latter observation is consistent with existing data on mammalian cells from this and other laboratories.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D002467:Cell Nucleus / Q000032:analysis; D003593:Cytoplasm / Q000032:analysis; D008099:Liver / Q000032:analysis; D008297:Male; D051379:Mice; D009693:Nucleic Acid Hybridization; D011061:Poly A / Q000032:analysis*; D011132:Polyribosomes / Q000032:analysis*; D012333:RNA, Messenger / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D012333:RNA, Messenger; D011061:Poly A