Cell identity and sexual development in Cryptococcus neoformans are controlled by the mating-type-specific homeodomain protein Sxi1alpha.

Journal Article (Journal Article)

Virulence in the human fungal pathogen Cryptococcus neoformans is associated with the alpha mating type. Studies to identify the properties of alpha cells that enhance pathogenesis have led to the identification of a mating-type locus of unusually large size and distinct architecture. Here, we demonstrate that the previously identified MATalpha components are insufficient to regulate sexual differentiation, and we identify a novel alpha-specific regulator, SXI1alpha. Our data show that SXI1alpha establishes alpha cell identity and controls progression through the sexual cycle, and we discover that ectopic expression of SXI1alpha in a cells is sufficient to drive a/alpha sexual development. SXI1alpha is the first example of a key regulator of cell identity and sexual differentiation in C. neoformans, and its identification and characterization lead to a new model of how cell fate and the sexual cycle are controlled in C. neoformans.

Full Text

Duke Authors

Cited Authors

  • Hull, CM; Davidson, RC; Heitman, J

Published Date

  • December 1, 2002

Published In

Volume / Issue

  • 16 / 23

Start / End Page

  • 3046 - 3060

PubMed ID

  • 12464634

Pubmed Central ID

  • PMC187491

International Standard Serial Number (ISSN)

  • 0890-9369

Digital Object Identifier (DOI)

  • 10.1101/gad.1041402


  • eng

Conference Location

  • United States