title: Lack of evidence for antisense suppression in the fungal plant pathogen Ustilago maydis.
abstract: Modulation of the expression of the Ustilago maydis Pyr3 gene, encoding dihydroorotase (DHOase), through antisense RNA regulation has been explored. This was done by placing the gene in sense and antisense orientations under the control of an hsp70-like gene promoter in a high-copy number autonomously replicating expression vector. Cells transformed with the antisense vector contained similar levels of DHOase activity to those found in cells harboring the expression vector alone. Transformants containing the antisense vector did not exhibit uridine-dependent growth, which would be expected for a Pyr3-deficient phenocopy. This was despite detection of high levels of antisense RNA transcripts in cells transformed with the Pyr3 antisense vector.
authors: IACR-Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, UK.
authors: J P
authors: JP
authors: Keon
authors: J W
authors: JW
authors: Owen
authors: J A
authors: JA
authors: Hargreaves
mesh_terms: D015152:Blotting, Northern; D015139:Blotting, Southern; D002261:Carboxin / Q000378:metabolism; D004080:Dihydroorotase / Q000235:genetics / Q000378:metabolism; D005656:Fungal Proteins / Q000235:genetics* / Q000378:metabolism; D015870:Gene Expression; D015971:Gene Expression Regulation, Enzymologic; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics; D010641:Phenotype; D011401:Promoter Regions, Genetic / Q000235:genetics; D016372:RNA, Antisense / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D014170:Transformation, Genetic; D014529:Uridine / Q000378:metabolism / Q000494:pharmacology; D014588:Ustilago / Q000187:drug effects / Q000201:enzymology / Q000235:genetics* / Q000254:growth & development
chemical_list: D005656:Fungal Proteins; D018840:HSP70 Heat-Shock Proteins; D016372:RNA, Antisense; D012333:RNA, Messenger; C075967:PYR3 protein, Ustilago maydis; D002261:Carboxin; D004080:Dihydroorotase; D014529:Uridine