Imprecise excision of P{GT1}4EHPBG01713 has caused the deletion of approximately 2.1kb - including all of exon 1 of 4EHP and part of intron 1.
Embryos produced by homozygous d4EHPCP53 females have a substantially reduced hatching frequency (52%) compared to wild-type flies (93%). Flies that do hatch have no conspicuous phenotypic defects, even when genetically homozygous themselves. The embryos that do not hatch exhibit patterning defects mostly affecting anterior segmentation.
Some protein is made from this mutant gene, probably due to translational initiation at a second AUG near the end of intron 1 (the mutation deletes the primary AUG). The predicted product lacks the first 12 amino acids, which are replaced with 6 new ones.