Primary structure, developmentally regulated expression and potential duplication of the zebrafish homeobox gene ZF-21.
We report the molecular cloning and characterization of a cDNA derived from a zebrafish gene (ZF-21) related to the mouse homeobox containing gene Hox2. 1. Interesting information about the differential conservation of various domains was gained from comparisons between the putative protein sequences from ZF-21 (275 amino acids) and Hox2.1 (279 aa). A separate DNA binding domain including the ZF-21 homeodomain and 36 additional flanking residues is completely identical to the C-terminal part of Hox2. 1. As a consequence, these two mouse and zebrafish proteins must have identical DNA binding properties. A lower level of sequence identity between the N-terminal coding regions of ZF-21 and Hox2.1 reduces the total protein homology to 81%. However, short stretches of perfect homology in these N-terminals suggests that the essential biochemical functions are the same. As expected for true homologues, the ZF-21 and Hox2.1 genes also share extensive similarities with respect to non-coding sequences and temporal expression during embryogenesis. The finding of a potential ZF-21 duplication is discussed in relation to functional and evolutionary aspects of vertebrate homeobox genes.[1]References
- Primary structure, developmentally regulated expression and potential duplication of the zebrafish homeobox gene ZF-21. Njølstad, P.R., Molven, A., Hordvik, I., Apold, J., Fjose, A. Nucleic Acids Res. (1988) [Pubmed]
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