Restriction enzyme-mediated DNA integration in Coprinus cinereus

Area of Science:

• Molecular Biology
• Mycology
• Genetics

Background:

• Restriction enzyme-mediated DNA integration (REMI) is an emerging technique for generating fungal mutants.
• Understanding REMI's impact on transformation efficiency and mutation rates is essential for its application.

Purpose of the Study:

• To analyze the efficacy of REMI in the basidiomycete Coprinus cinereus.
• To determine the influence of different restriction enzymes and their concentrations on transformation rates and mutation induction.

Main Methods:

• Utilized homologous pabI gene as a selectable marker in Coprinus cinereus.
• Employed restriction enzymes BamHI, EcoRI, and PstI in transformation mixtures.
• Investigated the effect of enzyme concentration and cell storage conditions on transformation outcomes.

Main Results:

• REMI accelerated transformant appearance and influenced transformation rates in an enzyme- and concentration-dependent manner.
• Optimal low enzyme concentrations increased transformation rates, while higher concentrations decreased them.
• Protoplast preparation from cold-stored cells significantly reduced transformation rates, even with enzyme presence.
• Plasmid integration correlated with restriction enzyme activity at random chromosomal sites, with potential reduction in integration events per transformant.
• Mutation rates were enhanced by the presence of restriction enzymes, alongside cytotoxic and mutagenic effects.

Conclusions:

• Restriction enzymes promote plasmid integration but also exhibit cytotoxic and mutagenic effects.
• Experimental determination of optimal enzyme concentration is necessary for maximizing transformant numbers and targeted REMI mutagenesis.
• Careful optimization of REMI conditions is required to balance enhanced integration with potential adverse effects.