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Cellulase enzymes play a key role in converting cellulosic biomass into fermentable sugars for the production of chemicals and fuels, which are often produced by filamentous fungi. However, most of the filamentous fungi obtained through natural breeding have low secretion ability when producing cellulase, which is far from meeting the requirements of industrial production. Combining random mutagenesis with adaptive laboratory evolution (ALE) strategies is an effective way to increase enzyme production in fungi. In addition, real-time reverse transcription quantitative PCR (RT-qPCR) can be used to analyze the transcript levels of major cellulase genes and transcription factor genes in isolated mutants.