Construct: Amino acid replacement: V77G. Amino acid replacement: I526V. Fragment carrying the BP1 P-element (deletion from nucleotides 578 to 684 compared to a full length P-element, in frame deletion of 35 amino acids) cloned from the Muller-5 Birmingham strain is fused to an Hsp70 promoter in sense orientation. Element also carried base substitutions as above.
The presence of Δ2-3 somatic transposase to Muller5-B X chromosome carrying five target P-elements causes pupal lethality, with or without heat shock P{S-BP1} can repress some of the lethality. P{S-BP1} fails to repress gonadal dysgenesis, either through a maternal effect or through a combination of zygotic and maternal effects, with or without heat shock. P{S-BP1} cannot repress snw mutability in the male germline or the somatic instability of snw (males have patches of weak sn, extreme sn and wild-type bristles) with or without heat shock. P{S-BP1} has no effect on the expression of the Ecol\lacZ gene of P{lacZ}snunspecified or P{lacZ}vasunspecified.