The mating type-specific homeodomain genes SXI1 alpha and SXI2a coordinately control uniparental mitochondrial inheritance in Cryptococcus neoformans.

Journal Article (Journal Article)

In the great majority of sexual eukaryotes, mitochondrial genomes are inherited almost exclusively from a single parent. While many hypotheses have been proposed to explain this phenomenon, very little is known about the genetic elements controlling uniparental mitochondria inheritance. In the bipolar, isogamous basidiomycete yeast Cryptococcus neoformans, progeny from crosses between strains of mating type a (MATa) and mating type alpha (MATalpha) typically inherit mitochondrial DNA (mtDNA) from the MATa parent. We recently demonstrated that a mating type alpha (MATalpha)-specific gene SXI1a, controls mitochondrial inheritance in C. neoformans. Here, we show that another homeodomain gene SXI2a in the alternative mating type MATa is also required for uniparental mtDNA inheritance in this fungus. Disruption of SXI2a resulted in biparental mtDNA inheritance in the zygote population with significant numbers of progeny inheriting mtDNA from the MATa parent, the MATalpha parent, and both the MATa and the MATalpha parents. In addition, progeny from same-sex mating between MATalpha strains showed a biparental mitochondrial inheritance pattern. Our results suggest that SXI1alpha and SXI2a coordinately control uniparental mitochondrial inheritance in C. neoformans.

Full Text

Duke Authors

Cited Authors

  • Yan, Z; Hull, CM; Sun, S; Heitman, J; Xu, J

Published Date

  • March 2007

Published In

Volume / Issue

  • 51 / 3

Start / End Page

  • 187 - 195

PubMed ID

  • 17186242

International Standard Serial Number (ISSN)

  • 0172-8083

Digital Object Identifier (DOI)

  • 10.1007/s00294-006-0115-9


  • eng

Conference Location

  • United States