title: RNA splicing of bacterial genes in eukaryotes.
abstract: The presence of intervening sequences or introns in eukaryotic genes has been known for more than 20 years, and the mechanisms underlying RNA splicing have been studied in depth both genetically and biochemically. In recent years, however, an increasing number of bacterial genes have been introduced into higher eukaryotes as important tools for genetic studies. Their gene products are frequently used as an indirect measure for cell type-specific promoter activity, as, for example, in the case of chloramphenicol acetyl transferase (CAT assay) or beta-galactosidase. Here we show that RNA splicing of two prokaryotic genes encoding site-specific DNA recombinases occurs in eukaryotic cells. In one case, splicing is only observed after treatment of cells with the cytokine alpha interferon. We further demonstrate that mutating an intragenic donor splice site in a bacterial gene apparently activates a second, alternative splicing pathway. In conjunction with previous reports, our findings should also be regarded as a warning that splicing of bacterial genes in higher eukaryotes is a more common phenomenon than presently recognized, which may be difficult to overcome and may cause problems in the interpretation of experimental results.
authors.affiliation: Institute of Genetics, University of Cologne, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Lorbach
authors.forename: Z
authors.initials: Z
authors.lastname: Wang
authors.forename: P
authors.initials: P
authors.lastname: Dröge
mesh_terms: D001483:Base Sequence; D003062:Codon; D005057:Eukaryotic Cells; D005798:Genes, Bacterial; D016297:Mutagenesis, Site-Directed; D012326:RNA Splicing; D012329:RNA, Bacterial
chemical_list: D003062:Codon; D012329:RNA, Bacterial