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Homologous gene replacement in Physarum

T G Burland1, D Pallotta

  • 1McArdle Laboratory for Cancer Research, University of Wisconsin, Madison 53706.

Genetics
|January 1, 1995
PubMed
Summary

Researchers developed a new gene replacement technique for Physarum polycephalum. This method successfully replaced the ardD actin gene, enabling further study of this important model organism.

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The one-kilobase DNA fragment upstream of the ardC actin gene of Physarum polycephalum is both a replicator and a promoter.

Molecular and cellular biology·1999

Area of Science:

  • Cellular Biology
  • Developmental Biology
  • Molecular Biology

Background:

  • Physarum polycephalum is a valuable model organism for cellular and developmental biology research.
  • Existing experimental methods limit the analysis of gene function in Physarum.
  • A gene replacement technique is needed to expand experimental possibilities.

Purpose of the Study:

  • To develop and demonstrate a homologous gene replacement method in Physarum polycephalum.
  • To analyze the function of the ardD actin gene by replacing it with a mutant allele.
  • To establish a stable gene replacement system for future functional genomics studies.

Main Methods:

  • Transformation of Physarum amoebae with linear plasmid DNA containing the mutant ardD delta 1 allele.
  • Selection and characterization of transformants exhibiting gene replacement.
  • Analysis of the stability and phenotypic effects of the ardD delta 1 allele through growth, development, and meiosis.

Main Results:

  • Homologous gene replacement was successfully achieved in Physarum using linear plasmid DNA.
  • The ardD delta 1 allele replaced the endogenous ardD+ gene in 5% of transformants.
  • The ardD delta 1 allele was stably maintained and showed no discernible effect on viability, growth, or development.

Conclusions:

  • This study presents the first successful homologous gene replacement in Physarum polycephalum.
  • The carboxy-terminal region of the ardD actin gene product is not essential for Physarum viability, growth, or development.
  • The developed gene replacement method is a powerful tool for functional analysis of cloned genes in Physarum.

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