synapse & microtubule
futschN94 mutant pupae prune all ddaC dendrites by 16 h after puparium formation (APF), similar to controls.
The third instar larval neuromuscular junctions of futschN94 heterozygotes display a significant decrease in the number, and a significant increase in the size, of terminal boutons, as compared to controls.
No defects in microtubule stability are observed in the distal boutons of the futschN94 mutant NMJ.
There is a decrease in the number of synaptic boutons at the neuromuscular junction in mutant third instar larvae.
futschN94 mutants display a 20% decrease in the number of boutons in larval neuromuscular junctions and a decrease in the number of "satellite" boutons, defined as boutons that are present in the axon of a branch or that bud off from neuronal connections between two boutons.
Mutants show no circadian defect detectable with actograms.
Phenotype is similar to that of Fmr1 gain of function mutants - reduced neuromuscular junction growth with decreased synaptic area, branching and bouton number. Neurotransmission at the NMJ is elevated, and in the photoreceptor is depressed.
In futschN94 homozygotes, synaptic microtubules no longer form a filamentous cytoskeletal shaft that runs through the nerve terminal, and microtubule loop formation is absent. There is also a reduction in bouton number and an increase in bouton size (bouton sizes increase over two-fold). Bouton number is reduced from an average of 64.8 boutons at muscle 4 in wild-type to 40.8 in mutants. Also mutant nerve-terminals at muscle 4 rarely have branch-points. In futschN94 heterozygotes, a small but statistically significant reduction of numbers of boutons (about 51.2 at muscle 4). No change in muscle size is seen in these mutants.
futschN94 has abnormal neuroanatomy | dominant phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]
futschN94 has abnormal size | dominant phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]
futschN94 has abnormal neuroanatomy | dominant phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]
futschN94 has abnormal size | dominant phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]
futschN94 has abnormal neuroanatomy phenotype, suppressible by Fmr1Δ50M
futschN94 has abnormal neurophysiology phenotype, suppressible by Fmr1Δ50M
futschN94/futsch[+] is an enhancer of abnormal neuroanatomy | dominant phenotype of NaPi-III21-4
futschN94/futsch[+] is an enhancer of abnormal size | dominant phenotype of NaPi-III21-4
futschN94/futsch[+] is an enhancer of abnormal neuroanatomy | dominant phenotype of NaPi-III15-1
futschN94/futsch[+] is an enhancer of abnormal size | dominant phenotype of NaPi-III15-1
futschN94 is a non-enhancer of semi-sterile phenotype of Fmr1Δ50M
futschN94/futsch[+] is a suppressor of abnormal neuroanatomy phenotype of NFATEP19579
futschN94/futsch[+] is a suppressor of abnormal neuroanatomy phenotype of NFATEP1508
futschN94/futsch[+] is a suppressor of abnormal neuroanatomy phenotype of Lrrke03680
futschN94 is a suppressor of abnormal neurophysiology phenotype of Fmr1Δ50M
futschN94 is a suppressor of abnormal neuroanatomy phenotype of Fmr1Δ50M
futschN94 is a non-suppressor of semi-sterile phenotype of Fmr1Δ50M
futschN94 is a non-suppressor of abnormal locomotor rhythm phenotype of Fmr13
futschN94 has embryonic/larval neuromuscular junction | third instar larval stage phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]
futschN94 has embryonic/larval motor neuron | third instar larval stage phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]
futschN94 has terminal bouton | third instar larval stage phenotype, non-enhanceable by NaPi-III21-4/NaPi-III[+]
futschN94 has embryonic/larval neuromuscular junction | third instar larval stage phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]
futschN94 has embryonic/larval motor neuron | third instar larval stage phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]
futschN94 has terminal bouton | third instar larval stage phenotype, non-enhanceable by NaPi-III15-1/NaPi-III[+]
futschN94 has synapse phenotype, non-enhanceable by Scer\GAL4how-24B/flexinEP
futschN94 has NMJ bouton | third instar larval stage | decreased number phenotype, non-suppressible by CanA1Δ.UAS.Tag:HA/Scer\GAL4Toll-6-D42
futschN94 has embryonic/larval hypodermal muscle cell | third instar larval stage phenotype, non-suppressible by CanA1Δ.UAS.Tag:HA/Scer\GAL4Toll-6-D42
futschN94 has bouton phenotype, non-suppressible by Scer\GAL4RapGAP1-OK6/sggA81T.UAS
futschN94 has synapse phenotype, non-suppressible by Scer\GAL4how-24B/flexinEP
futschN94/futsch[+] is an enhancer of embryonic/larval motor neuron | third instar larval stage phenotype of NaPi-III15-1
futschN94/futsch[+] is an enhancer of terminal bouton | third instar larval stage phenotype of NaPi-III15-1
futschN94/futsch[+] is an enhancer of embryonic/larval neuromuscular junction | third instar larval stage phenotype of NaPi-III21-4
futschN94/futsch[+] is an enhancer of embryonic/larval motor neuron | third instar larval stage phenotype of NaPi-III21-4
futschN94/futsch[+] is an enhancer of terminal bouton | third instar larval stage phenotype of NaPi-III21-4
futschN94/futsch[+] is an enhancer of embryonic/larval neuromuscular junction | third instar larval stage phenotype of NaPi-III15-1
futschN94/futsch[+] is a suppressor of lipid droplet | increased number | adult stage phenotype of ND-42ninaE.GD6220
futschN94/futsch[+] is a suppressor of ommatidium | adult stage phenotype of ND-42ninaE.GD6220
futschN94/futsch[+] is a suppressor of microtubule phenotype of foxo21
futschN94/futsch[+] is a suppressor of synapse phenotype of NFATEP1508, Scer\GAL4Toll-6-D42
futschN94/futsch[+] is a suppressor of synapse phenotype of NFATEP19579, Scer\GAL4Toll-6-D42
futschN94/futsch[+] is a suppressor of neuromuscular junction phenotype of Lrrke03680
futschN94/futsch[+] is a suppressor of NMJ bouton phenotype of Lrrke03680
futschN94 is a suppressor of bouton | increased number phenotype of Scer\GAL4RapGAP1-OK6, sggA81T.UAS
futschN94 is a suppressor of neuromuscular junction phenotype of Fmr1Δ50M
futschN94, Scer\GAL4elav.PU, futsch[+], TBPHUAS.Tag:FLAG is a non-suppressor of embryonic/larval neuromuscular junction | third instar larval stage phenotype of TBPHΔ23
futschN94, Scer\GAL4elav.PU, futsch[+], TBPHUAS.Tag:FLAG is a non-suppressor of NMJ bouton | third instar larval stage phenotype of TBPHΔ23
futschN94, Scer\GAL4elav.PU, futsch[+], TBPHUAS.Tag:FLAG is a non-suppressor of microtubule | third instar larval stage phenotype of TBPHΔ23
αTub84BK394R, futschN94 has microtubule | larval stage phenotype
αTub84BK394R, futschN94 has embryonic/larval neuromuscular junction | larval stage phenotype
αTub84BK394R, futschN94 has type Ib terminal bouton | larval stage phenotype
The decreased number and increased size of terminal boutons in third instar larval neuromuscular junctions of NaPi-III21-4, futschN94 and NaPi-III15-1, futschN94 double heterozygotes is similar to NaPi-III21-4 single heterozygotes and enhanced compared to futschN94 single heterozygotes.
A futschN94 heterozygous background restores normal synaptic length when NFATEP1508 is expressed under the control of Scer\GAL4D42.
A futschN94 heterozygous background restores normal synaptic length when NFATEP19579 is expressed under the control of Scer\GAL4D42.
One copy of futschN94 prevents expression of TBPHScer\UAS.T:Zzzz\FLAG under the control of Scer\GAL4elav.PU from rescuing the reduction in bouton number and terminal branches seen in muscles 6 and 7 of homozygous TBPHΔ23 third instar larvae. futschN94/+ also prevents TBPHScer\UAS.T:Zzzz\FLAG from restoring microtubule stability in the TBPHΔ23 mutant flies.
Removal of futsch activity in a heterozygous futschN94 background rescues the synaptic overgrowth phenotype found in Lrrke03680 heterozygotes.
Expression of sggA81T.Scer\UAS under the control of Scer\GAL4OK6, in a futschN94 background suppresses the increased larval neuromuscular bouton number phenotype, seen when sggA81T.Scer\UAS is expressed in a wild-type background. The phenotype is nearer to that seen in futschN94 single mutants, although the bouton number is not decreased as much.