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The fruiting body of one of the most widely cultivated mushrooms, the oyster mushroom (Pleurotus ostreatus) is highly interesting, both commercially and scientifically. In the present study, we performed comparative proteomic profiling of  P. ostreatus  at two unique developmental stages; mycelium and fruit body, using two-dimensional gel electrophoresis (2-DE). Seven hundred fourteen (714) spots were detected and 29 spots (showing a high level of difference in their expressions) were identified by tandem mass spectrometry and basic local alignment search tool (BLAST) searching of an expressed sequence tag (EST) database of P. ostreatus. Among them, six proteins (putative fatty acid oxygenase, heat shock sks2, PriA homologue, Ap-1 like transcription factor YAP7, mung bean seed albumin, and C2H2 Zinc finger domain protein) and one protein (peroxisomal biogenesis factor 6) showed increased expression levels at the fruiting process and the mycelial stage, respectively. Through reverse transcriptase-polymerase chain reaction analysis, priA homologue and AP-1 like transcription factor yap7 showed gradually increased expression from mycelia to fruit body, whereas putative fatty acid oxygenase and heat shock protein sks2 were expressed only in the fruit body. These results provide useful information for future studies of mushroom development of P. ostreatus.   Keywords : Developmental stage, mushroom fruiting,  Pleurotus ostreatus , protein, two-dimensional gel electrophoresis   African Journal of Biotechnology  Vol. 12(24), pp. 3790-3796

Isolation and characterization of differentially expressed genes in the mycelium and fruit body of Pleurotus ostreatus