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Genes involved in Dictyostelium discoideum sexual reproduction

Hideko Urushihara1, Tetsuya Muramoto

  • 1Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba-shi, Ibaraki-ken 305-8572, Japan. hideko@biol.tsukuba.ac.jp

European Journal of Cell Biology
|July 4, 2006
PubMed

Insights

Cellular slime molds have alternative reproduction methods. This study investigates the genetic control of sexual reproduction (macrocyst formation) in Dictyostelium discoideum, identifying novel regulators.

Area of Science:

  • Cellular and Molecular Biology
  • Developmental Biology
  • Genetics

Background:

  • Cellular slime molds exhibit diverse reproductive strategies, including asexual division, fruiting body formation, and sexual macrocyst formation.
  • While asexual development is well-understood, the genetic underpinnings of sexual reproduction in these organisms remain largely unexplored.
  • Understanding the choice between these reproductive modes is crucial for comprehending their life cycle and genome function.

Purpose of the Study:

  • To investigate the molecular genetic control of sexual reproduction (macrocyst formation) in Dictyostelium discoideum.
  • To identify genes regulating sexual cell interactions and explore their role in sexual development.
  • To elucidate the contribution of sexual cycle regulation to the overall genome organization and function of Dictyostelium discoideum.

Main Methods:

  • Analysis of sexually deficient mutants with normal asexual development.
  • Reverse genetic analysis of genes identified in a gamete-specific subtraction library.
  • Identification of cell-surface proteins involved in sexual cell fusion using blocking antibodies.

Main Results:

  • Several cell-surface proteins implicated in sexual cell fusion were identified, though their genes were not isolated.
  • Analysis revealed that sexual reproduction is controlled by both specific and shared genes with asexual development.
  • Reverse genetics identified four genes regulating sexual cell interactions, including a novel cAMP pathway regulator specific to sexual development.

Conclusions:

  • The genetic regulation of sexual reproduction in Dictyostelium discoideum involves specific and shared genes.
  • Novel regulators of sexual cell interactions and cAMP signaling have been identified.
  • Further studies on the molecular genetics of the sexual cycle enhance understanding of the Dictyostelium discoideum genome.

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