A 1586-base-pair contiguous genomic segment containing the entire fourth exon and a portion of the fifth exon of boi have been replaced by a w+mW.hs marker. The mutation results in the deletion of the AUG initiation codon of boi, the signal sequence, and the four Ig domains from the coding sequence. The z gene (which is nested within boi) is intact.
boiKO is found to be homozygous viable and fertile.
boiKO, ihogGLC has ventral denticle belt phenotype
boiKO, ihogGLC has embryonic/first instar larval cuticle phenotype
Animals bred to homozygosity for both ihogGLC and boiKO die in early larval stages.
Embryos derived from maternal germline clones of ihogGLC in a boiKO homozygous mutant background show a cuticle phenotype. Cuticle preparations from the mutant embryos reveal a fully penetrant phenotype in which naked cuticle normally present in the posterior of each segment fails to develop, resulting in a continuous lawn of poorly patterned denticles.