title: Expression of the mRNA (N6-adenosine)-methyltransferase S-adenosyl-L-methionine binding subunit mRNA in cultured cells.
abstract: Ribonuclease protection assays (RPA) were used to detect and quantitate the amount of messenger RNA (mRNA) coding for the S-adenosyl-L-methionine binding subunit (MT-A70) of the mRNA (N6-adenosine)-methyltransferase from different types of cultured cells. HeLa cells cultured in suspension were analyzed at regular intervals along a normal growth curve. It was discovered that MT-A70 mRNA was transcribed constitutively across the time-course, irrespective of the rate of cellular proliferation. Further, 11 different cell lines representing non-tumorigenic, tumorigenic, and virally-transformed tumorigenic types from Homo sapiens, Mus musculus, and Rattus norvegicus were examined for MT-A70 mRNA expression. It was found that all the cell lines expressed a long and short splice-variant form of the gene. In general, the cell lines expressed a similar total amount of the MT-A70 mRNA while statistically significant differences existed between the quantity of the long and short forms among cell types. Tumorigenic cell lines synthesized as much as a 9-fold greater amount of long form versus short form MT-A70 mRNA. Comparatively, non-tumorigenic cell lines generally expressed only a 1.5-fold greater amount of long form versus short form MT-A70 mRNA.
authors.affiliation: Department of Biological Sciences, Ohio University, Athens, OH45701, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Leach
authors.forename: M T
authors.initials: MT
authors.lastname: Tuck
mesh_terms: D000818:Animals; D002455:Cell Division; D002472:Cell Transformation, Viral; D002478:Cells, Cultured; D019175:DNA Methylation; D015870:Gene Expression / Q000502:physiology; D006367:HeLa Cells; D006801:Humans; D008780:Methyltransferases / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D051379:Mice; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D012436:S-Adenosylmethionine / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D012680:Sensitivity and Specificity; D014158:Transcription, Genetic; D014407:Tumor Cells, Cultured
chemical_list: D010446:Peptide Fragments; D012333:RNA, Messenger; D012436:S-Adenosylmethionine; D008780:Methyltransferases; C022556:mRNA (2'-O-methyladenosine-N6-)-methyltransferase