Xinyi Nie

Learn More
Candida albicans, a commensal organism and a pathogen of humans, can switch stochastically between a white phase and an opaque phase without an intermediate phase. The white and opaque phases have distinct cell shapes and gene expression programs. Once switched, each phase is stable for many cell divisions. White-opaque switching is under a1-alpha2(More)
To investigate the changes in transcript and relative protein levels in response to temperature, complementary transcriptomic and proteomic analyses were used to identify changes in Aspergillus flavus grown at 28 °C and 37 °C. A total of 3,886 proteins were identified, and 2,832 proteins were reliably quantified. A subset of 664 proteins was differentially(More)
Candida albicans is a human pathogenic fungus which can undergo a morphological transition from yeast to hyphae in response to a variety of environmental stimuli. We analyzed a C. albicans Asc1 (Absence of growth Suppressor of Cyp1) protein which is entirely composed of seven repeats of the WD domain, and is conserved from fungi to metazoan. Deleting the(More)
The ability of dimorphic transition between yeast and hyphal forms in Candida albicans is one of the vital determinants for its pathogenicity and virulence. We isolated C. albicans SWI1 as a suppressor of the invasive growth defect in a Saccharomyces cerevisiae mutant. Expression of C. albicans SWI1 in S. cerevisiae partially complemented the growth defect(More)
DNA methylation is essential for epigenetic regulation of gene transcription and development in many animals, plants and fungi. We investigated whether DNA methylation plays a role in the development and secondary metabolism of Aspergillus flavus, identified the DmtA methyltransferase from A. flavus, and produced a dmtA knock-out mutant by replacing the(More)
Phenotypic switching in Candida albicans spontaneously generates different cellular morphologies. The reversible switching between white and opaque phenotypes is regulated by multiple regulators including Efg1 and Wor1. In mating-type-like locus (MTL) homozygous cells, the Efg1 functions as a repressor, whereas the Wor1 acts as an activator in white-opaque(More)
This study focused on AflSkn7, which is a stress response regulator in the aflatoxin-producing Aspergillus flavus. The ΔAflSkn7 mutants exhibited partially defective conidial formation and a complete inability to generate sclerotia, indicating AflSkn7 affects A. flavus asexual and sexual development. The mutants tolerated osmotic stress but were partially(More)
In Aspergillus nidulans, the nitrogen metabolite repression (NMR) regulator NmrA plays a major role in regulating the activity of the GATA transcription factor AreA during nitrogen metabolism. However, the function of nmrA in A. flavus has not been previously studied. Here, we report the identification and functional analysis of nmrA in A. flavus. Our work(More)
Cyclic AMP signaling controls a range of physiological processes in response to extracellular stimuli in organisms. Among the signaling cascades, cAMP, as a second messenger, is orchestrated by adenylate cyclase (biosynthesis) and cAMP phosphodiesterases (PDEs) (hydrolysis). In this study, we investigated the function of the high-affinity (PdeH) and(More)
Aflatoxins (AFs), produced mainly by Aspergillus flavus and Aspergillus parasiticus, are strongly toxic and carcinogenic. Here, we showed that glutamine is the optimal nitrogen source for AF-production in A. flavus grown in Czapek Dox medium. Additionally, 4mM glutamine was the threshold for high production of aflatoxin B1. However, no significant impact of(More)