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- W4362587303 abstract "ABSTRACT In fungi, conserved homeobox-domain (HD) proteins are transcriptional regulators governing development. In Aspergillus species, several HD transcription factor genes have been identified, among them, hbxA / hbx1 . For instance, in the opportunistic human pathogen Aspergillus fumigatus , hbxA is involved in conidial production and germination, as well as virulence and secondary metabolism (SM), including production of fumigaclavines, fumiquinazolines, and chaetominine. In the agriculturally important fungus Aspergillus flavus, disruption of hbx1 results in fluffy aconidial colonies unable to produce sclerotia. hbx1 also regulates production of aflatoxins, cyclopiazonic acid and aflatrem. Furthermore, transcriptome studies revealed that hbx1 has a broad effect on the A. flavus genome, including numerous genes involved in SM. These studies underline the importance of the HbxA/Hbx1 regulator, not only in developmental processes but also in the biosynthesis of a broad number of fungal natural products, including potential medical drugs and mycotoxins. To gain further insight into the regulatory scope of HbxA in Aspergilli , we studied its role in the model fungus Aspergillus nidulans . Our present study of the A. nidulans hbxA -dependent transcriptome revealed that more than one thousand genes are differentially expressed when this regulator was not transcribed at wild-type levels, among them numerous transcription factors, including those involved in development as well as in SM regulation. Furthermore, our metabolomics analyses revealed that production of several secondary metabolites, some of them associated with A. nidulans hbxA -dependent gene clusters, was also altered in deletion and overexpression hbxA strains compared to the wild type, including synthesis of nidulanins A, B and D, versicolorin A, sterigmatocystin, austinol, dehydroaustinol, and three unknown novel compounds." @default.
- W4362587303 created "2023-04-06" @default.
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- W4362587303 date "2023-04-02" @default.
- W4362587303 modified "2023-10-01" @default.
- W4362587303 title "Homeobox Transcription Factor HbxA Influences Expression of over One Thousand Genes in the Model Fungus Aspergillus nidulans" @default.
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- W4362587303 doi "https://doi.org/10.1101/2023.03.30.533655" @default.
- W4362587303 hasPublicationYear "2023" @default.
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