Mobilization of P{GSV6}Ibf2GS16482, resulting in loss of the w gene from the transposon sequences but retention of part of the transposon that renders the Ibf2 gene nonfunctional.
Homozygotes and hemizygotes with Df(3R)ED5339 show reduced viability (60-70%), male sterility and many of the eclosed flies are short-lived.
70% of Ibf2GSV17 homozygous adult females exhibit loss of bristle formation in the A7 sternite - bristles resemble those normally found in more anterior sternites. 14% of Ibf2GSV17 heterozygotes and 72% of Ibf2GSV17/Df(3R)ED5339 transheterozygotes also show this phenotype.
Heterozygosity for Ibf2GSV17 increases the eye pigmentation in w+mC.Fab-8 flies (in a w[-] background). Homozygosity for Ibf2GSV17 increases eye pigmentation still further.
Ibf2GSV17 behaves as a double Ibf1, Ibf2 null mutation regarding chromatin regulation, as Ibf1 protein is unable to bing chromatin in the absence of Ibf2.