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Bacterial Transformation

Bacterial Transformation

In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...

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Updated: Jun 4, 2026

Genetic Engineering of Dictyostelium discoideum Cells Based on Selection and Growth on Bacteria

Genetic Engineering of Dictyostelium discoideum Cells Based on Selection and Growth on Bacteria

Published on: January 25, 2019

Selection of dictyostelium transformants.

Pascale Gaudet¹, Petra Fey, Rex Chisholm

¹dictyBase, Center for Genetic Medicine, Northwestern University, Chicago, IL 60611, USA.

|March 2, 2011

Summary

Dictyostelium discoideum, a social amoeba, serves as a powerful model for studying eukaryotic cell biology. Its genetic tractability allows for various DNA-mediated transformations, aiding research in cell communication and motility.

Area of Science:

Cell Biology
Molecular Biology
Genetics

Background:

Dictyostelium discoideum is a unicellular eukaryote exhibiting social behavior, forming multicellular structures under nutrient limitation.
It is a valuable model organism for understanding conserved eukaryotic processes like cell-to-cell communication, intracellular signaling, and cytoskeletal organization during motility.
The availability of a complete genome and mutant strains enhances its utility in biological research.

Purpose of the Study:

To highlight Dictyostelium discoideum as a model organism for studying fundamental cellular processes.
To describe common genetic manipulation techniques applicable to Dictyostelium.
To detail DNA-mediated transformation methods and selection strategies.

Main Methods:

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DNA-mediated transformation using calcium phosphate precipitation and electroporation.

Selection of transformants in liquid media or on bacterial plates.

Utilizing bacterial plates for easier clone isolation and contamination reduction.

Main Results:

Dictyostelium discoideum is amenable to gene knockout, overexpression, RNA interference, and other genetic modifications.
Bacterial plate selection is advantageous for isolating single transformant colonies and minimizing contamination.
Obtaining multiple independent clones with similar phenotypes is crucial for validating gene ablation experiments.

Conclusions:

Dictyostelium discoideum is a versatile model for genetic studies due to its amenability to various transformation techniques.
Bacterial plate selection offers practical benefits for isolating and validating genetic modifications.
Rigorous validation using multiple clones is essential for accurate interpretation of experimental results in Dictyostelium research.