Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Computational Analysis Reveals a Key Regulator of Cryptococcal Virulence and Determinant of Host Response

Journal Article · · mBio (Online)
 [1];  [2];  [2];  [3];  [3];  [2];  [3];  [3];  [4];  [3];  [5];  [3]
  1. Washington Univ., St. Louis, MO (United States). Center for Genome Sciences and Systems Biology. Dept. of Molecular Microbiology; DOE/OSTI
  2. Washington Univ., St. Louis, MO (United States). School of Medicine; Washington Univ., St. Louis, MO (United States). Dept. of Computer Science and Engineering
  3. Washington Univ., St. Louis, MO (United States). Center for Genome Sciences and Systems Biology. Dept. of Molecular Microbiology
  4. Washington Univ., St. Louis, MO (United States). Dept. of Pathology and Immunology
  5. Washington Univ., St. Louis, MO (United States). School of Medicine; Washington Univ., St. Louis, MO (United States). Dept. of Computer Science and Engineering; Washington Univ., St. Louis, MO (United States). Dept. of Genetics
Cryptococcus neoformans is a ubiquitous, opportunistic fungal pathogen that kills over 600,000 people annually. Here, we report integrated computational and experimental investigations of the role and mechanisms of transcriptional regulation in cryptococcal infection. Major cryptococcal virulence traits include melanin production and the development of a large polysaccharide capsule upon host entry; shed capsule polysaccharides also impair host defenses. We found that both transcription and translation are required for capsule growth and that Usv101 is a master regulator of pathogenesis, regulating melanin production, capsule growth, and capsule shedding. It does this by directly regulating genes encoding glycoactive enzymes and genes encoding three other transcription factors that are essential for capsule growth: GAT201, RIM101, and SP1. Murine infection with cryptococci lacking Usv101 significantly alters the kinetics and pathogenesis of disease, with extended survival and, unexpectedly, death by pneumonia rather than meningitis. Our approaches and findings will inform studies of other pathogenic microbes.
Research Organization:
Washington Univ., St. Louis, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
FG02-93ER20097
OSTI ID:
1630030
Journal Information:
mBio (Online), Journal Name: mBio (Online) Journal Issue: 2 Vol. 7; ISSN 2150-7511
Publisher:
American Society for Microbiology (ASM)Copyright Statement
Country of Publication:
United States
Language:
English

References (40)

Construction of Saccharomyces cerevisiae strains with enhanced ethanol tolerance by mutagenesis of the TATA-binding protein gene and identification of novel genes associated with ethanol tolerance journal April 2011
Cryptococcus neoformans : historical curiosity to modern pathogen: Cryptococcus neoformans journal January 2014
Mutations of the TATA-binding protein confer enhanced tolerance to hyperosmotic stress in Saccharomyces cerevisiae journal May 2013
Preventing Cryptococcosis—Shifting the Paradigm in the Era of Highly Active Antiretroviral Therapy journal April 2015
Distinct sets of SEC genes govern transport vesicle formation and fusion early in the secretory pathway journal May 1990
Cryptococcal immune reconstitution inflammatory syndrome in HIV-1-infected individuals: proposed clinical case definitions journal November 2010
Cytokines and chemokines: At the crossroads of cell signalling and inflammatory disease journal November 2014
Systematic Genetic Analysis of Virulence in the Human Fungal Pathogen Cryptococcus neoformans journal October 2008
A Major Role for Capsule-Independent Phagocytosis-Inhibitory Mechanisms in Mammalian Infection by Cryptococcus neoformans journal March 2011
Cryptococcus neoformans Copper Detoxification Machinery Is Critical for Fungal Virulence journal March 2013
Immortalized human cerebral microvascular endothelial cells maintain the properties of primary cells in an in vitro model of immune migration across the blood brain barrier journal January 2013
Cryptococcus neoformans, a fungus under stress journal August 2007
A Library of Yeast Transcription Factor Motifs Reveals a Widespread Function for Rsc3 in Targeting Nucleosome Exclusion at Promoters journal December 2008
Emerging themes in cryptococcal capsule synthesis journal October 2011
Systematic functional profiling of transcription factor networks in Cryptococcus neoformans journal April 2015
Isolation and characterization of capsule structure mutant strains of Cryptococcus neoformans: C. neoformans capsule structure mutants journal July 2002
Functional cloning and characterization of a UDP- glucuronic acid decarboxylase: The pathogenic fungus Cryptococcus neoformans elucidates UDP-xylose synthesis journal October 2001
A Novel Specificity Protein 1 (SP1)-like Gene Regulating Protein Kinase C-1 (Pkc1)-dependent Cell Wall Integrity and Virulence Factors in Cryptococcus neoformans journal June 2011
UDP-glucose Dehydrogenase Plays Multiple Roles in the Biology of the Pathogenic Fungus Cryptococcus neoformans journal September 2004
A Eukaryotic Capsular Polysaccharide Is Synthesized Intracellularly and Secreted via Exocytosis journal December 2006
The yeast putative transcriptional repressor RGM1 is a proline-rich zinc finger protein journal January 1991
Saccharomyces Genome Database: the genomics resource of budding yeast journal November 2011
Estimation of the current global burden of cryptococcal meningitis among persons living with HIV/AIDS journal January 2009
Nsf1/Ypl230w participates in transcriptional activation during non-fermentative growth and in response to salt stress in Saccharomyces cerevisiae journal August 2008
Cryptococcus neoformans and Cryptococcus gattii, the Etiologic Agents of Cryptococcosis journal July 2014
Mapping functional transcription factor networks from gene expression data journal May 2013
Model-driven mapping of transcriptional networks reveals the circuitry and dynamics of virulence regulation journal February 2015
The ethanol stress response and ethanol tolerance of Saccharomyces cerevisiae journal January 2010
Comprehensive phenotypic analysis for identification of genes affecting growth under ethanol stress in Saccharomyces cerevisiae journal February 2009
The Cryptococcus neoformans Capsule: a Sword and a Shield journal July 2012
Posttranslational, Translational, and Transcriptional Responses to Nitric Oxide Stress in Cryptococcus neoformans : Implications for Virulence journal March 2006
Sexual Cycle of Cryptococcus neoformans var. grubii and Virulence of Congenic a and α Isolates journal September 2003
The Cryptococcus neoformans Rim101 Transcription Factor Directly Regulates Genes Required for Adaptation to the Host journal December 2013
Ctr2 Links Copper Homeostasis to Polysaccharide Capsule Formation and Phagocytosis Inhibition in the Human Fungal Pathogen Cryptococcus neoformans journal September 2010
A Sensitive High-Throughput Assay for Evaluating Host-Pathogen Interactions in Cryptococcus neoformans Infection journal July 2011
Functional Analyses of NSF1 in Wine Yeast Using Interconnected Correlation Clustering and Molecular Analyses journal October 2013
Interaction of Cryptococcus neoformans Rim101 and Protein Kinase A Regulates Capsule journal February 2010
Toward an Integrated Model of Capsule Regulation in Cryptococcus neoformans journal December 2011
Elucidating the immunological function of the Cryptococcus neoformans capsule journal September 2013
IL-1α and IL-1β Recruit Different Myeloid Cells and Promote Different Stages of Sterile Inflammation journal September 2011

Cited By (8)

5-fluorocytosine resistance is associated with hypermutation and alterations in capsule biosynthesis in Cryptococcus journal January 2020
Mon1 Is Essential for Fungal Virulence and Stress Survival in Cryptococcus neoformans journal April 2018
Unraveling synthesis of the cryptococcal cell wall and capsule journal April 2018
Unraveling Melanin Biosynthesis and Signaling Networks in Cryptococcus neoformans journal October 2019
Cdk8 and Ssn801 Regulate Oxidative Stress Resistance and Virulence in Cryptococcus neoformans journal February 2019
Unintended Side Effects of Transformation Are Very Rare in Cryptococcus neoformans journal January 2018
Comparative Ecology of Capsular Exophiala Species Causing Disseminated Infection in Humans journal December 2017
Cryptococcal Traits Mediating Adherence to Biotic and Abiotic Surfaces journal July 2018

Similar Records

Sac1 links phosphoinositide turnover to cryptococcal virulence
Journal Article · Tue Aug 13 20:00:00 EDT 2024 · mBio (Online) · OSTI ID:2530393

Methamphetamine Enhances Cryptococcus neoformans Pulmonary Infection and Dissemination to the Brain
Journal Article · Mon Jul 29 20:00:00 EDT 2013 · mBio (Online) · OSTI ID:1626103

Related Subjects