Deletion of 2.0kb including 5' sequences up to the junction of exon 1 and intron 1.
Homozygous females lay eggs with normal morphology but the embryos fail to develop to the gastrulation stage; there are extensive disruptions in the actin hexagonal arrays. Development is normal up to nuclear stage 13 and extensive nuclear fusion starts after this stage. Abnormal nuclear morphology is correlated with cytoskeletal structure defects, the cleavage furrow is grossly disrupted.