Insertion of P element into the 5' untranslated region of cdc2.
The cdc2E1-24/cdc2216P combination shows temperature sensitivity: at 29oC flies fail to eclose, while at 25oC viable adults with abdominal defects eclose. Mutations at Cdc37 dominantly enhance this abdominal phenotype, causing profound derangement of abdominal structures, missing bristles, and fused segments. Mutations at Cdc37 also reduced the temperature at which the inviability of cdc2E1-24/cdc2216P takes effect.
Die after pupariation at the larval-pupal interface. Larvae take 1-2 days longer than wild type to reach the wandering stage. Imaginal discs are missing or rudimentary and larval brains are reduced in size. Endoreplication and polytenization of larval cells is normal, as are salivary gland size and intensity of DNA staining of their polytene nuclei.