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Stage-specific gene expression during sexual development in Phytophthora infestans
Anna-Liisa Fabritius1, Cristina Cvitanich, Howard S Judelson
1Department of Plant Pathology, University of California, Riverside, CA 92521, USA.
Molecular Microbiology
|August 16, 2002
Summary
Researchers identified eight genes crucial for sexual development in Phytophthora infestans. These genes show significant upregulation during mating, with some involved in RNA stability and others in plant defense responses.
Area of Science:
- Oomycete biology
- Molecular genetics
- Plant pathology
Background:
- Phytophthora infestans is an oomycete pathogen responsible for late blight in potatoes and tomatoes.
- Sexual reproduction in oomycetes is complex and less understood than asexual reproduction.
- Identifying genes involved in sexual development is key to understanding pathogen life cycles and control.
Purpose of the Study:
- To identify and characterize genes upregulated during sexual development in Phytophthora infestans.
- To investigate the temporal expression patterns of these mating-induced genes.
- To analyze the functional similarity of the gene products.
Main Methods:
- Suppression subtractive hybridization (SSH) was used to identify differentially expressed genes.
- Quantitative and qualitative expression analysis was performed using Northern blotting or similar techniques.
- Sequence analysis was conducted to predict the functions of identified gene products.
Main Results:
- Eight genes were identified as upregulated during sexual development in Phytophthora infestans.
- Two genes were induced early in mating, before gametangial formation, with 40- to >100-fold induction.
- Six genes were induced later, coinciding with gametangia and oospore formation, with 60- to >100-fold induction.
- Predicted products of three genes are involved in RNA stability (ribonuclease activator, pumilio, RNase H).
- Products of two genes resemble known Phytophthora proteins that elicit plant defense responses.
- Mating-induced genes were also expressed in a self-fertile heterokaryon, but with quantitative and qualitative differences.
- Two extrachromosomal RNA elements were also identified.
Conclusions:
- Sexual development in Phytophthora infestans involves the coordinated upregulation of specific genes.
- These genes play roles in RNA regulation and potentially in host-pathogen interactions.
- Understanding these genetic mechanisms can provide insights into oomycete biology and pathogenicity.