Role transkripčních faktorů Meis v embryonálním vývoji zebřičky Danio rerio

Brežinová, Veronika

Meis transcription factors belong to the group of TALE (three amino acids loop extension) homeodomain proteins. Meis2 proteins have a potential role in regulation of neural crest cells development and in differentiation of their derivates. Zebrafish genome has two paralogues of meis2 gene, meis2a and meis2b. CRISPR/Cas9 technology was used to prepare mutant lines of both paralogues, meis2a and meis2b, for the purpose of study of function of Meis2 transcription factors. Specific morpholinos that reduce the expression of meis2a and meis2b were used as controls. Craniofacial and cardiac development in mutant fish was analyzed in the meis2a line by RNA in situ hybridization, histological cartilage staining, and computed tomography. While we observed impaired craniofacial and cardiac development after injection of specific Morpholinos, we did not detect similar changes in the meis2a KO line. Our genetic approach has not clearly shown that the meis2a paralogue itself plays an important role in craniofacial development and cardiac development. For more detailed analysis, further experiments on fish lines with combined meis2a and meis2b knock-outs are needed. Key words Mutagenesis CRISPR, Danio rerio, neural crest cells, Meis2, transcription factor

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