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Mer1 and Nam8 in splicing regulation
Marková, Michaela ; Abrhámová, Kateřina (advisor) ; Stejskalová, Eva (referee)
By the mutual cooperation, Mer1 nad Nam8 proteins activate pre-mRNA splicing of four specific genes: AMA1, MER2, MER3 and SPO22, that are required for meiotic recombination and nuclear division. Expression of these genes does not change during the cell cycle, nevertheless, the efficient splicing of their pre-mRNA occures only during meiosis because Mer1 protein, which facilitates their splicing, is expressed only in meiotic cells. All these pre-mRNAs contain nonconsensual 5'splice site (5'ss) which is less recognizable for the spliceosomal subunit U1 snRNP in comparison with the consensual sequence. There is an enhancer area near to 5'ss on the pre-mRNA of this genes that serves as a binding site for Mer1p which makes recruitment of U1 snRNP more efficient. Mer1p cooperate via other proteins with Nam8p. Protein Nam8, a part of U1 sn RNP, is bound on pre-mRNA downstream from 5'ss close to the enhancer area. Mer1p in cooparation with Nam8p facilitates spliceosome assembly on the nonconsensual 5'ss and subsequently pre-mRNA splicing.
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