Expression kinetics of six cellulase and four expansin-related genes were 
studied in the hypercellulolytic Trichoderma reesei CL847 mutant in response to 
Solka Floc cellulose and soluble inducers. Real-time PCR showed a parallel 
increase of transcript levels for the cellulase genes cbh1/cel7a, egl1/cel7b, 
egl4/cel61a, the beta-glucosidase genes bgl1/cel3a, bgl2/cel1a, and the swo1 
gene, encoding the cell-wall loosening protein swollenin. To evaluate a putative 
implication of three newly identified expansin/family 45 endoglucanase-like 
(EEL) proteins in lignocellulose degradation, their expression was also 
analysed. Only eel2 was found to be transcribed under the present conditions, 
and showed constitutive expression similar to the endoglucanase encoding cel5b 
gene.