Imprecise excision of the P{EP}CG12974EP756 insertion, resulting in an 1500bp deletion that removes part of the CG12974 transcription unit. The transcription start site of Z4 is unaffected.
Homozygous larvae remain in the third instar phase for an extensively prolonged time, but eventually pupariate and die in the early pupal stage.
Homozygous third instar larvae have many aberrant chromosomes in salivary gland preparations, showing a progressive loss of the band/interband structure, with the severity of disintegration of the banded structure increasing with age. The regions of the chromosome that have lost the band/interband organisation have a decompacted and cloudy appearance.
Z41.3/Z47.1 larvae have aberrant salivary gland chromosomes which have lost the normal band/interband structure and are disorganised, showing an overall decompaction of the chromosomal material.
pzg7.1 is rescued by pzgTag:MYC
The lethal phenotype of the Df(3L)Z4-7.1 chromosome is rescued by the P{Z4myc} construct, which contains the complete Z4 gene, but not the complete CG12974 gene, suggesting that the lethality of the Df(3L)Z4-7.1 chromosome is due to an effect on the Z4 gene.