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Two Cdc2 Kinase Genes with Distinct Functions in Vegetative and Infectious Hyphae in


In the model yeasts and filamentous fungi, CDC2 is an essential gene that encodes the only CDK essential for mitotic cell cycle progression. However, the wheat scab fungus F. graminearum contains two CDC2 orthologs. The cdc2A and cdc2B deletion mutants had no defects in vegetative growth but deletion of both is lethal. Whereas the cdc2B mutant was normal, the cdc2A mutant was almost non-pathogenic, indicating that only Cdc2A is essential in infectious hyphae. Cdc2A and Cdc2B differ in subcellular localization and only localization of Cdc2A to the nucleus was increased in cells active in mitosis. Furthermore, F. graminearum uniquely has two orthologs of Ipl1 Aurora kinase and mutants deleted of orthologs of five essential yeast mitotic kinase genes were viable. However, most of these mutants were significantly reduced in virulence. Overall, our data indicate that F. graminearum differs from the model fungi in CDK and other key mitotic kinase genes, and cell cycle regulation is different between vegetative and infectious hyphae. This is the first report on two Cdc2 kinases in fungi and they differ in subcellular localization and functions during sexual reproduction and plant infection.


Vyšlo v časopise: Two Cdc2 Kinase Genes with Distinct Functions in Vegetative and Infectious Hyphae in. PLoS Pathog 11(6): e32767. doi:10.1371/journal.ppat.1004913
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1004913

Souhrn

In the model yeasts and filamentous fungi, CDC2 is an essential gene that encodes the only CDK essential for mitotic cell cycle progression. However, the wheat scab fungus F. graminearum contains two CDC2 orthologs. The cdc2A and cdc2B deletion mutants had no defects in vegetative growth but deletion of both is lethal. Whereas the cdc2B mutant was normal, the cdc2A mutant was almost non-pathogenic, indicating that only Cdc2A is essential in infectious hyphae. Cdc2A and Cdc2B differ in subcellular localization and only localization of Cdc2A to the nucleus was increased in cells active in mitosis. Furthermore, F. graminearum uniquely has two orthologs of Ipl1 Aurora kinase and mutants deleted of orthologs of five essential yeast mitotic kinase genes were viable. However, most of these mutants were significantly reduced in virulence. Overall, our data indicate that F. graminearum differs from the model fungi in CDK and other key mitotic kinase genes, and cell cycle regulation is different between vegetative and infectious hyphae. This is the first report on two Cdc2 kinases in fungi and they differ in subcellular localization and functions during sexual reproduction and plant infection.


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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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