A new dominant selectable marker for genetic transformation; Hsp70-opd

New P element plasmids containing the organophosphate-degrading gene opd as a dominant selectable marker were tested as transformation vectors in Drosophila melanogaster, One of these vectors was modified by the addition of the D. melanogaster mini-white gene as a comarker, When transformed individuals were identified using paraoxon selection for opd alone, results were similar to those obtained with mini-white, No false positives were recovered, however one strain contained the mini-white gene but inadequate resistance to survive our screening regimen due to a defective Hsp70-opd gene, Results suggest that Hsp70-opd is similar to mini-white for distinguishing transformed individuals, but does not require time-consuming individual examination, Due to the mode of action of organophosphorus nerve agents, Hsp70-opd has potential as a selectable marker in numerous animals beside fruit flies.