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Transcription factors CSL and their role in the yeast Schizosaccharomyces pombe
Oravcová, Martina ; Převorovský, Martin (advisor) ; Heidingsfeld, Olga (referee) ; Krásný, Libor (referee)
Proteins of the CSL family (CBF1/RBP-Jκ/Suppressor of Hairless/LAG-1) act as effectors of the Notch signalling pathway in metazoan organisms. They function as repressors or activators of gene transcription in the framework of this pathway and influence many developmental processes. Metazoan CSL proteins can regulate gene expression Notch-independently as well. Notch-independent functions of CSL proteins might be evolutionarily ancestral and in cells and organisms may be important equally as Notch-dependent functions. Presence of CSL proteins was identified in several fungal species, organisms lacking the Notch signalling pathway components and most of known metazoan interacting partners of CSL proteins. CSL paralogs of the fission yeast Schizosaccharomyces pombe, cbf11 and cbf12, are non-essential genes encoding proteins localized in the nucleus of the cell. They exert antagonistic effects on regulation of processes like coordination of nuclear and cellular division and cell cycle progression, ploidy maintenance, cell adhesion and other. In this study, we have proved that both CSL paralogs are able to sequence-specifically bind the CSL-response element DNA in vitro and Cbf11 in vivo as well. Both proteins could activate gene expression in vivo and perform the function of transcription factors....

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