Sexuality and parasitism share common regulatory pathways in the fungus Parasitella parasitica.
Parasitella parasitica, a facultative mycoparasite of zygomycetous fungi, forms cytoplasmic fusions with its hosts during infection. Thus, the organism is an efficient donor of genetic material in parasexual host-parasite interactions. Recognition between parasite and host is mediated by trisporoids, which are also responsible for sexual communication. The TDH gene for one of the key enzymes of trisporic acid biosynthesis, 4-dihydromethyl-trisporate dehydrogenase, was cloned and its transcription analysed. TDH was cloned on a 6175-bp insert and was found to map in a complex cluster of genes that suggest post-transcriptional antisense regulation. Histochemical TDH analysis in developing parasitic or sexual structures shows high enzymatic activity in Parasitella. TDH is linked to a gene for a putative acyl-CoA thioesterase (ACT). Two ORFs were identified in the 5'-region of the TDH gene, a third one, coding for 176 amino acids overlaps the ACT gene in antisense direction completely. Expression levels of ACT and ORF1 depend on parasitic and sexual interactions.
Schultze
Kornelia
K
Institute for Microbiology, Friedrich-Schiller-Universität Jena, Chair of General Microbiology and Microbe Genetics, Neugasse 24, D-07743 Jena, Germany.
Schimek
Christine
C
Wöstemeyer
Johannes
J
Burmester
Anke
A
D000595:Amino Acid Sequence; D001483:Base Sequence; D015152:Blotting, Northern; D003001:Cloning, Molecular; D004271:DNA, Fungal / Q000737:chemistry / Q000235:genetics; D005231:Fatty Acids, Unsaturated / Q000096:biosynthesis; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D005800:Genes, Fungal / Q000235:genetics; D008040:Genetic Linkage; D008969:Molecular Sequence Data; D009090:Mucorales / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D016366:Open Reading Frames / Q000235:genetics; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism; D010170:Palmitoyl-CoA Hydrolase / Q000235:genetics; D011061:Poly A / Q000235:genetics; D012331:RNA, Fungal / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid
D004271:DNA, Fungal; D005231:Fatty Acids, Unsaturated; D005656:Fungal Proteins; D012331:RNA, Fungal; C004574:trisporic acid; D011061:Poly A; D010088:Oxidoreductases; C500532:dihydromethyl-trisporate dehydrogenase; D010170:Palmitoyl-CoA Hydrolase