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Replication and expression of a bacterial--mitochondrial hybrid plasmid in the fungus Podospora anserina
Abstract:
Hybrid plasmids consisting of the bacterial plasmid pBR322 and plasmid-like DNA (pl DNA) sequences from the fungus Podospora anserina are not only able to replicate in Escherichia coli but also in the fungus. This was proved by both biophysical and biological evidence involving buoyant density profiles, DNA.DNA hybridization, and restriction analysis--all confirming that pl DNA behaves as a true plasmid. During its amplification in P. anserina, the hybrid plasmid does not lose its prokaryotic coding capacity as shown after retransfer and subsequent cloning in E. coli. P. anserina is able to express both the eukaryotic and the prokaryotic genetic information of the hybrid plasmid because the occurrence of senescence and the production of beta-lactamase could be shown in experiments involving specific hybrid plasmids. In the same systems, it was possible to demonstrate that a hybrid plasmid containing, instead of pl DNA, a pl DNA homologous region of native mtDNA also could function as a true plasmid. This hybrid plasmid contained about 25% of the genetic information pl DNA, which corresponds to about 6% of the genetic information of mtDNA. Thus, the data show that hybrid plasmids may be used to shuttle genetic information between P. anserina and E. coli. hence, through the use of a mtDNA replicon, as evidenced by the pl DNA of P. anserina, another pathway in genetic engineering is established.
Insights
Hybrid plasmids combining bacterial and fungal DNA replicate in both organisms, enabling genetic information transfer. This establishes a new pathway for genetic engineering by shuttling genetic material between Podospora anserina and E. coli.
Area of Science:
- Molecular Biology
- Mycology
- Genetic Engineering
Background:
- Plasmid-like DNA (pl DNA) from Podospora anserina exhibits unique replication properties.
- Understanding the behavior of hybrid plasmids in different hosts is crucial for genetic manipulation.
Purpose of the Study:
- To investigate the replication and expression of hybrid plasmids containing P. anserina pl DNA in both fungal and bacterial systems.
- To establish a method for shuttling genetic information between P. anserina and Escherichia coli.
Main Methods:
- Construction of hybrid plasmids using pBR322 and P. anserina pl DNA or mtDNA homologous regions.
- Replication studies in P. anserina and E. coli.
- Biophysical and biological analyses including buoyant density, DNA.DNA hybridization, and restriction analysis.
- Functional assays for senescence (P. anserina) and beta-lactamase production (E. coli).
Main Results:
- Hybrid plasmids replicated successfully in both P. anserina and E. coli, behaving as true plasmids.
- P. anserina expressed both eukaryotic and prokaryotic genetic information from the hybrid plasmids.
- Hybrid plasmids containing mtDNA homologous regions also functioned as plasmids.
- Genetic information could be shuttled between the two organisms.
Conclusions:
- Hybrid plasmids serve as effective vectors for transferring genetic information between P. anserina and E. coli.
- The pl DNA of P. anserina, functioning as a mtDNA replicon, establishes a novel pathway for genetic engineering.
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