visible | pupal stage (with slsg65)
mitosis & nuclear chromosome
mitosis & nuclear chromosome (with slse4)
slsj1D7 heterozygous adults have an apparently normal morphology and are able to fly, as are able to sustain high frequency wing beat, as compared to controls.
Mutant embryos show grossly normal morphology, normal segmentation, normal epidermal denticle belts and normal patterning of the neuromusculature. They show greatly reduced movement compared to wild-type. Mature embryos show striking defects in individual muscle fibre morphology. The parallel myofilament array seen in wild-type muscles is disrupted and myofilaments are arranged irregularly, both longitudinally and transversely. The unit of a thick myosin filament surrounded by an array of thin actin filaments can form correctly, whereas the overall arrangement of myofilaments is largely disrupted.
slsg65/slsj1D7 has visible | pupal stage phenotype, non-enhanceable by tn[+]/tnΔA
sls[+]/slsj1D7 is an enhancer of partially lethal - majority live phenotype of Scer\GAL4Mef2.PU, cherJF02077
sls[+]/slsj1D7 is an enhancer of lethal | adult stage phenotype of Mlp84BP20/Df(3R)dsx2M
sls[+]/slsj1D7 is a non-enhancer of visible | pupal stage phenotype of tnΔA/tn1
sls[+]/slsj1D7 is a suppressor of lethal - all die before end of pupal stage phenotype of tnMJO-348
sls[+]/slsj1D7 is a suppressor of decreased body size phenotype of tnMJO-348
cherEPSΔ5, sls[+]/slsj1D7 has abnormal flight phenotype
chersko, sls[+]/slsj1D7 has abnormal flight phenotype
sls[+]/slsj1D7 is an enhancer of myofibril | adult stage phenotype of Scer\GAL4Mef2.PU, cherJF02077
sls[+]/slsj1D7 is an enhancer of sarcomere | adult stage phenotype of Scer\GAL4Mef2.PU, cherJF02077
sls[+]/slsj1D7 is an enhancer of pupal cuticle phenotype of Mlp84BP20/Df(3R)dsx2M
sls[+]/slsj1D7 is a suppressor of visceral muscle fiber phenotype of tnMJO-348
sls[+]/slsj1D7 is a suppressor of filamentous actin phenotype of tnMJO-348
slsj1D7 heterozygotes also heterozygous for either cherEPSΔ5 or chersko, but not cherQ1042X, exhibit flight defects, since high frequency wing beat is only sustained for a few seconds, as compared to wild-type and single heterozygous controls; in both genetic background, however, there are no obvious sarcomere defects.
Heterozygosity for slsj1D7 enhances the semi-lethality and the myofibril shredding defects (even leading to the loss of the sarcomere structure) resulting from the expression of cherJF02077 under the control of Scer\GAL4Mef2.PU.
Pupae trans-heterozygous for tnMJO-348 and slsj1D7 undergo proper pupal morphogenesis and eclosion. Notably, mutant pupae homozygous for tnMJO-348 and heterozygous for slsj1D7 are slim and show a statistically significant increase in length when compared to homozygous tnMJO-348 pupae. This result indicates a suppression of the muscle contraction and morphogenetic defects that are associated with the tnMJO-348 mutant phenotype.
slsj1D7/+ does not enhance the tn1/tnΔA thin pupae phenotype.
slsj1D7/+ enhances the Df(3R)Mlp84BP8/Df(3R)dsx2M thin pupae phenotype.
tnΔA/+ does not enhance the slsj1D7/slsg65 thin pupae phenotype.
slsj1D7 heterozygosity greatly increases the adult lethality of Df(3R)Mlp84BP8/Df(3R)dsx2M mutants. slsj1D7 heterozygosity also exacerbates the pupal case elongation phenotype associated with Df(3R)Mlp84BP8/Df(3R)dsx2M or Mlp84BP20/Df(3R)dsx2M.
slsj1D7 heterozygosity reduces the viability of Mlp84BP20/Df(3R)dsx2M mutants to zero.
slsj1D7 heterozygosity in a Df(3R)Mlp84BP8/Df(3R)dsx2M mutant background leads to striking muscle abnormalities. Most muscle fibers are wavy and/or spindly in appearance. A significant number of fibers are torn or show some degree of fraying. Closer examination of the double mutants reveals a profound loss of sarcomeric structure of single muscle fibers from third instar fillet preparations. Neither Df(3R)Mlp84BP8/Df(3R)dsx2M hemizygotes, nor slsj1D7 heterozygotes on their own display any obvious structural abnormalities at the light microscopic level.
L. and Y. Jan.
Excision of the P{lacW} element can give viable revertants. Based on the lethal stage and antibody staining, sls alleles form the series: slsS000201 (weakest), slsB173, slsC995, slsj1D7, slsB68, slsC872 (strongest).
Excision of the P{lacW} reverts the lethal phenotype.
Complements: l(3)0626506265.