Analysis of novel alleles of brother of tout-velu, the drosophila ortholog of human EXTL3 using a newly developed FRT42D ovo(D) chromosome.

The FLP/FRT system permits rapid phenotypic screening of homozygous lethal mutations in the context of a viable mosaic fly. Combining this system with ovo(D) dominant female-sterile transgenes enables efficient production of embryos derived from mutant germline clones lacking maternal contribution from a gene of interest. Two distinct sets of FRT chromosomes, carrying either the mini-white (w (+ mW.hs) ), or rosy (ry(+) ) and neomycin (neo(R) ) transgenes are in common use. Parallel ovo(D) lines were developed using w (+ mW.hs) FRT insertions on the X and chromosomes 2R and 3L, as well as ry(+) , neo(R) FRT insertions on 2L and 3R. Consequently, mutations isolated on the X, 2R and 3L chromosomes in a ry(+) , neo(R) FRT background, are not amenable to germline clonal analysis without labor-intensive recombination onto chromosome arms containing a w (+ mW.hs) FRT. Here we report the creation of a new ovo(D) line for the ry(+) , neo(R) FRT insertion at position FRT42D on chromosome 2R, through induced recombination in males. To establish the developmental relevance of this reagent we characterized the maternal-effect phenotypes of novel brother of tout-velu alleles generated on an FRT42D chromosome in a somatic mosaic screen. We find that an apparent null mutation that causes severe defects in somatic tissues has a much milder effect on embryonic patterning, emphasizing the necessity of analyzing mutant phenotypes at multiple developmental stages.

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