Imprecise excision of P{lacW}tutlk14703 results in a 11,430bp deficiency within the tutl gene, disrupting all tutl transcripts.
Approximately 10% of tutlex383 embryonic segments have gaps in the longitudinal connectives and commissures. A minor enhancement of this phenotype is observed in embryos that are trans-heterozygous tutlex383/Df(2L)ed-dp.
Sixty-percent of tutlex383 homozygous embryos exhibit axon defasciculation with some axons projecting to the midline. Fas2-positive axon tracts maintain their relative distance from the midline, but axons emanating from all three fascicles bundle together as they cross the midline.
Embryos trans-heterozygous for tutlex383 and tutl01085 have defects in commissures, longitudinal connective, and Fas2-positive axon tracts that maintain their relative distance from the midline, but that have axons emanating from all three fascicles bundle together as they cross the midline.
In tutlex383 embryos, the ISNb motor axons succesfully reach the vicinity of their respective targets. However, the majority of them fail to send one or more of the final axon branches to contact their muscle targets. Half of the hemisegments also lack ISNd nerves.
Embryos trans-heterozygous for tutlex383 and tutl01085 have a similar embryonic motor axon projection defects to tutlex383 homozygotes, but with lower frequency.
tutl[+]/tutlex383 is an enhancer of abnormal neuroanatomy phenotype of fraGA957
tutl[+]/tutlex383 is a non-enhancer of abnormal neuroanatomy phenotype of robo[+]/robo15, sli1
tutl[+]/tutlex383 is a non-enhancer of abnormal neuroanatomy phenotype of robo15, sli[+]/sli1
tutl[+]/tutlex383 is an enhancer of symmetrical commissure phenotype of fraGA957
tutl[+]/tutlex383 is an enhancer of larval longitudinal connective phenotype of fraGA957
tutl[+]/tutlex383 is a non-enhancer of commissure phenotype of robo[+]/robo15, sli1
tutl[+]/tutlex383 is a non-enhancer of commissure phenotype of robo15, sli[+]/sli1
A tutlex383 heterozygous background dramatically enhances the fraGA957 mutant phenotype. fraGA957, tutlex383 double mutants typically have only one thin and fragmented commissure along the entire length of the embryo, indicating an extreme reduction in commissure formation and fragmented longitudinal connectives.
A tutlex383 heterozygous background dramatically enhances the Df(1)NP5 mutant phenotype. Df(1)NP5 ; tutlex383 double mutants typically have only one thin and fragmented commissure along the entire length of the embryo, indicating an extreme reduction in commissure formation and fragmented longitudinal connectives.
Triple trans-heterozygous sli1/+, robo5/+, tutlex383/+ do not appear different from double sli1/+, robo5/+ mutants, indicating that tutl does not function as an inhibitor of the sli pathway.
tutlex383 is rescued by tutlAT02763.UAS/Scer\GAL4sim.PS
tutlex383 is rescued by tutlGH15753.UAS/Scer\GAL4sim.PS
tutlex383 is rescued by Scer\GAL4elav-C155/tutlGH15753.UAS
tutlex383 is rescued by Scer\GAL4elav-C155/tutlAT02763.UAS
tutlex383 is rescued by Scer\GAL4sim.PS/tutlHL01565.UAS
tutlex383 is rescued by Scer\GAL4elav-C155/tutlHL01565.UAS
tutlex383 is rescued by tutlLD28224.UAS/Scer\GAL4sim.PS
tutlex383 is rescued by tutlLD28224.UAS/Scer\GAL4elav-C155
tutlex383 is rescued by tutlGH08133.UAS/Scer\GAL4sim.PS
tutlex383 is rescued by Scer\GAL4elav-C155/tutlGH08133.UAS
Df(2L)ed-dp/tutlex383 is rescued by tutlGH15753.UAS/Scer\GAL4sim.PS
Df(2L)ed-dp/tutlex383 is rescued by Scer\GAL4elav-C155/tutlGH15753.UAS
Df(2L)ed-dp/tutlex383 is rescued by tutlAT02763.UAS/Scer\GAL4sim.PS
Df(2L)ed-dp/tutlex383 is rescued by Scer\GAL4elav-C155/tutlAT02763.UAS
Df(2L)ed-dp/tutlex383 is rescued by Scer\GAL4sim.PS/tutlHL01565.UAS
Df(2L)ed-dp/tutlex383 is rescued by Scer\GAL4elav-C155/tutlHL01565.UAS
Df(2L)ed-dp/tutlex383 is rescued by tutlLD28224.UAS/Scer\GAL4sim.PS
Df(2L)ed-dp/tutlex383 is rescued by tutlLD28224.UAS/Scer\GAL4elav-C155
Df(2L)ed-dp/tutlex383 is rescued by tutlGH08133.UAS/Scer\GAL4sim.PS
Df(2L)ed-dp/tutlex383 is rescued by Scer\GAL4elav-C155/tutlGH08133.UAS
tutlex383 is not rescued by tutlGH15753.UAS/Scer\GAL4repo
tutlex383 is not rescued by tutlAT02763.UAS/Scer\GAL4repo
tutlex383 is not rescued by Scer\GAL4repo/tutlHL01565.UAS
tutlex383 is not rescued by tutlLD28224.UAS/Scer\GAL4repo
tutlex383 is not rescued by Scer\GAL4repo/tutlGH08133.UAS
Df(2L)ed-dp/tutlex383 is not rescued by tutlGH15753.UAS/Scer\GAL4repo
Df(2L)ed-dp/tutlex383 is not rescued by tutlAT02763.UAS/Scer\GAL4repo
Df(2L)ed-dp/tutlex383 is not rescued by Scer\GAL4repo/tutlHL01565.UAS
Df(2L)ed-dp/tutlex383 is not rescued by tutlLD28224.UAS/Scer\GAL4repo
Df(2L)ed-dp/tutlex383 is not rescued by Scer\GAL4repo/tutlGH08133.UAS
Post-mitotic neuronal expression of tutlHL01565.Scer\UAS, tutlGH15753.Scer\UAS, tutlAT02763.Scer\UAS, tutlLD28224.Scer\UAS or tutlGH08133.Scer\UAS under the control of either Scer\GAL4sim.PS or Scer\GAL4elav-C155 fully rescues the midline crossing defects found in tutlex383 and tutlex383/Df(2L)ed-dp mutants. Expression under the control of Scer\GAL4repo does not rescue the phenotype, indicating that expression near the midline is important for rescue.
Post-mitotic neuronal expression of tutlAT02763.Scer\UAS under the control of Scer\GAL4elav-C155 is sufficient to rescue adult lethality found in tutlex383 mutants.
Expression of either tutlGH15753.Scer\UAS or tutlAT02763.Scer\UAS via Scer\GAL4elav-C155 can reduce the motor axon projection defects found in tutlex383 homozygotes.
Expression of either tutlGH15753.Scer\UAS or tutlAT02763.Scer\UAS driven by the pan-neuronal driver Scer\GAL4elav-C155 rescues most aspects of tutlk14703/tutlex383 mutant eye defects.