A heat shock promoter drives expression of a 3.4kb cDNA fragment encoding Su(var)3-7 amino acids 37 to 1169. The Su(var)3-7 protein is tagged at the N-terminal end with Tag:HA.
Expression of Su(var)3-7FL.hs.T:Ivir\HA1 enhances variegation of w (carried on the P{Winkelried}D insertion) in In(2)Heidi-P{Winkelried}D flies. Expression of Su(var)3-7FL.hs.T:Ivir\HA1 enhances variegation of w in In(1)wm4h.
Su(var)3-7FL.hs.Tag:HA is a suppressor of lethal | third instar larval stage phenotype of mle1
Su(var)3-7FL.hs.Tag:HA is a suppressor of FlyBase_internalproperty type:chromosome:chromosome phenotype of mle1
The expression of msl-2Hsp83.PK in females overexpressing Su(var)3-7FL.hs.T:Ivir\HA1 causes the X chromosomes to condense as typically seen only in males overexpressing Su(var)3-7FL.hs.T:Ivir\HA1.
The presence of Su(var)3-7FL.hs.T:Ivir\HA1 suppresses the mle1 phenotype resulting in almost normal male X chromosome morphology.
A Su(var)3-7R2a8 background kills males expressing msl-1Hsp83.PC-msl-2Hsp83.PK. Homozygous Su(var)3-7R2a8 females crossed with transgenic msl-1Hsp83.PC-msl-2Hsp83.PK males produce only 6% of male adult progeny harbouring the transgenes compared to 48% if the mothers are heterozygous for Su(var)3-7R2a8.
Su(var)3-7FL.hs.Tag:HA partially rescues Su(var)3-714