title: Establishment of an efficient RNA silencing system in Trichoderma koningii using DsRed as a reporter.
abstract: We aimed to establish an efficient RNA interference (RNAi) system in the industrially important filamentous fungus Trichoderma koningii using the DsRed protein as a reporter of the silencing process. To accomplish this, a DsRed expression cassette was transformed into T. koningii, and a recombinant strain that stably expressed DsRed was obtained. Next, a vector-directing expression of a DsRed hairpin RNA was constructed and transformed into the T. koningii recipient strain. Approximately 79 % of transformants displayed a decrease in DsRed fluorescence, and expression of DsRed in some transformants appeared to be fully suppressed. Characterization of randomly selected transformants by genomic DNA PCR analysis, real-time PCR quantification, and western blot confirmed downregulation of gene expression at different levels. The RNA silencing approach described here for T. koningii is effective, and the DsRed reporter gene provides a convenient tool for identification of silenced fungal transformants by their DsRed fluorescence compared to the control strain. The results of this study demonstrate the power of RNAi in T. koningii, which supports the use of this technology for strain development programs and functional genomics studies in industrial fungal strains.
authors.affiliation: School of Life Sciences, Northeast Normal University, Changchun, 130024, China.
authors.forename: Shaowen
authors.initials: S
authors.lastname: Wang
authors.forename: Miao
authors.initials: M
authors.lastname: Xing
authors.forename: Shenli
authors.initials: S
authors.lastname: Tian
authors.forename: Deming
authors.initials: D
authors.lastname: Gou
authors.forename: Baiqu
authors.initials: B
authors.lastname: Huang
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
mesh_terms: D015153:Blotting, Western; D005453:Fluorescence; D020869:Gene Expression Profiling; D055785:Gene Knockdown Techniques / Q000379:methods*; D017930:Genes, Reporter; D005827:Genetics, Microbial / Q000379:methods*; D008164:Luminescent Proteins / Q000032:analysis* / Q000235:genetics; D034622:RNA Interference; D034741:RNA, Small Interfering / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D011995:Recombination, Genetic; D014170:Transformation, Genetic; D014242:Trichoderma / Q000235:genetics*
chemical_list: D008164:Luminescent Proteins; D034741:RNA, Small Interfering; C413663:fluorescent protein 583