Antisense repression in Cryptococcus neoformans as a laboratory tool and potential antifungal strategy.
Journal Article (Journal Article)
Antisense repression was used as a method to alter gene function in the human-pathogenic fungus Cryptococcus neoformans. The calcineurin A gene (CNA1) and the laccase gene (LAC1) were targeted since disruption of these loci results in phenotypes that are easy to screen (temperature sensitivity and lack of melanin, respectively). Serotype D yeasts were transformed with a plasmid containing the CNA1 cDNA in an antisense orientation under the control of the inducible GAL7 promoter, and serotype A yeasts were transformed with a plasmid containing the LAC1 cDNA in an antisense orientation under the control of the constitutive actin promoter. The calcineurin transformants demonstrated a temperature-sensitive phenotype only when grown on galactose, and the laccase transformants had decreased melanin production. Northern blot analysis of the calcineurin antisense transformants confirmed that the inducible phenotype was associated with a decrease in the native CNA1 transcript levels. Furthermore, it was possible to modestly impair growth of C. neoformans at 37 degrees C by using a 30 bp antisense oligonucleotide targeting CNA1. Antisense repression is now available as a tool for molecular studies in this organism, and may be applicable to other human-pathogenic fungi that have less amenable genetic systems.
Full Text
Duke Authors
Cited Authors
- Gorlach, JM; McDade, HC; Perfect, JR; Cox, GM
Published Date
- January 2002
Published In
Volume / Issue
- 148 / Pt 1
Start / End Page
- 213 - 219
PubMed ID
- 11782513
International Standard Serial Number (ISSN)
- 1350-0872
Digital Object Identifier (DOI)
- 10.1099/00221287-148-1-213
Language
- eng
Conference Location
- England