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Efficient gene targeting in the moss Physcomitrella patens

D G Schaefer1, J P Zrÿd

  • 1Laboratoire de Phytogénétique Cellulaire, Université de Lausanne, Lausanne-Dorigny, Switzerland. Didier.Schaefer@lpc.unil.ch

The Plant Journal : for Cell and Molecular Biology
|June 1, 1997
PubMed
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Gene targeting in the moss Physcomitrella patens is highly efficient, exceeding 90%. This breakthrough enables precise genetic modifications for studying plant development and suggests a link between efficient gene targeting and haplophase in eukaryotes.

Area of Science:

  • Plant Biology
  • Genetics
  • Molecular Biology

Background:

  • The moss Physcomitrella patens is a key genetic model for plant development studies due to its dominant haploid gametophyte phase.
  • Efficient gene targeting is crucial for genetic manipulation but has been limited in plants compared to lower eukaryotes.

Purpose of the Study:

  • To determine the efficiency of gene targeting in the moss Physcomitrella patens.
  • To assess the feasibility of gene knock-out and allele replacement for plant development research.

Main Methods:

  • Transformation experiments targeting three single-copy genomic loci in Physcomitrella patens.
  • Molecular analysis to confirm homologous recombination and integration of exogenous DNA.

Main Results:

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  • Gene targeting efficiency in Physcomitrella patens was found to be above 90%.
  • Transformation rates were 10-fold higher with targeting vectors compared to previous methods.
  • Molecular evidence confirmed successful integration of DNA via homologous recombination at targeted loci.

Conclusions:

  • Physcomitrella patens exhibits highly efficient gene targeting, comparable to yeast.
  • This efficiency makes gene knock-out and allele replacement readily accessible for studying plant development.
  • The findings suggest a potential correlation between efficient gene targeting and haplophase across eukaryotes.