74bp deletion and a 6bp insertion, resulting in a premature stop codon.
Progeny of tweek1/+ parents have occasional embryonic mortality; about half of those that die have severe cuticle and patterning defects.
Most tweek1/Df(2L)Exel8036, tweek1/tweek2 and tweek1/tweekc01084 animals die as pharate adults, although a few adult escapers are seen. These adult escapers are severely uncoordinated.
Flies with homozygous eyes (made using the eyFLP method) have abnormal electroretinograms, with severely reduced "on" and "off" transient amplitudes compared to controls.
Most synaptic components are normal in homozygous lamina cartridges, however synaptic vesicle density appears markedly reduced compared to controls. The number of glial invaginations (capitate projections) in the homozygous photoreceptor cell terminals are not different from that of wild type, but they are not deeply invaginated or headed in the mutants, instead often remaining shallow.
tweek1/tweek2 mutants have a normal excitatory junctional potential amplitude during low-frequency stimulation (< 1Hz).
tweek1/Df(2L)Exel8036 mutants show a decline in excitatory junctional potential amplitude to approximately 55-60% of the initial response when stimulated at 10Hz in 5mM Ca[2+] (controls maintain release at about 90% of the initial response after 10 minutes under these conditions).
tweek1/tweek2 animals show a significant reduction of FM1-43 dye uptake at the third larval instar neuromuscular junction compared to controls.
The amplitude of spontaneous excitatory junctional potentials (mEJPs) is increased in tweek1/tweek2 animals compared to controls.
tweek2/tweek1 has embryonic/larval neuromuscular junction | third instar larval stage | somatic clone phenotype, non-enhanceable by Df(3R)3450/WASp1
tweek2/tweek1 has embryonic/larval neuromuscular junction | third instar larval stage | somatic clone phenotype, non-enhanceable by nwk1
tweek2/tweek1 has embryonic/larval neuromuscular junction | third instar larval stage | somatic clone phenotype, non-enhanceable by Scer\GAL4nSyb.PS/Avic\GFPEGFP.UAS.Tag:PH(hPLCD1)
tweek2/tweek1 has embryonic/larval neuromuscular junction | third instar larval stage | somatic clone phenotype, non-enhanceable by Scer\GAL4nSyb.PS/Avic\GFPEGFP.PLCD1(PH-S39R).UAS
Expression of Hsap\PLCD1PH.Scer\UAS.T:Avic\GFP-EGFP under the control of Scer\GAL4n-syb.PS does not enhance the neuromuscular junction overgrowth phenotype seen in tweek1/tweek2 third instar larvae.
Expression of Hsap\PLCD1PH.S39R.Scer\UAS.T:Avic\GFP-EGFP under the control of Scer\GAL4n-syb.PS does not enhance the neuromuscular junction overgrowth phenotype seen in tweek1/tweek2 third instar larvae.
tweek2/tweek1 is rescued by tweek+tHB69
tweek2/tweek1 is rescued by tweek+tHB69
Expression of the tweek+tHB69 genomic fragment rescues the neuromuscular junction overgrowth seen in tweek1/tweek2 third instar larvae.