Expression of Nrg180ΔFIGQY in a Nrgl4 mutant background does not result in a significant increase in synaptic retraction in third instar larvae compared to controls. NMJ length and bouton number are increased compared to controls. The bouton area is significantly reduced compared to controls.
Flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background are unable to establish a normal function of the Giant Fibre (GF)-Trochanteral Muscle (TTMn) circuit; there are significant increases in average response latencies and a decrease in following frequencies after a train of stimulations at 100Hz when compared to wild type. Morphological defects are seen at GF terminals. The GFs are present at the synaptic target area, however large areas of the synaptic terminals are either thinner or swollen and often contain large vacuole-like structures. Synaptic gap junctions are still present in animals that do not show any functional response.
The synaptic Giant Fibre (GF) to Trochanteral Muscle (TTMn) connection is severely weakened in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background. The GF synapse is unable to follow multiple stimuli given at 100 Hz in a 1:1 ratio and Response Latency is increased. Synaptic terminals are morphologically defective and reduced in size.
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, suppressible by Hsap\L1CAMRSLE-.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, suppressible by Hsap\L1CAMRSLE-.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, suppressible by Hsap\L1CAML120V.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, suppressible by Hsap\L1CAML120V.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, suppressible by Hsap\L1CAMH38.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, suppressible by Hsap\L1CAMH38.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, suppressible | partially by Hsap\L1CAMC264Y.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, suppressible | partially by Hsap\L1CAMC264Y.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, suppressible by Hsap\L1CAM4A.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, suppressible by Hsap\L1CAM4A.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, non-suppressible by Hsap\L1CAMH1.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, non-suppressible by Hsap\L1CAMH1.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, non-suppressible by Hsap\L1CAMH210Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, non-suppressible by Hsap\L1CAMH210Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, non-suppressible by Hsap\L1CAMR184Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, non-suppressible by Hsap\L1CAMR184Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neurophysiology | adult stage phenotype, non-suppressible by Hsap\L1CAMUAS.1180/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has abnormal neuroanatomy | adult stage phenotype, non-suppressible by Hsap\L1CAMUAS.1180/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, suppressible by Hsap\L1CAMRSLE-.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction phenotype, suppressible by Hsap\L1CAMRSLE-.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, suppressible by Hsap\L1CAML120V.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, suppressible by Hsap\L1CAML120V.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, suppressible by Hsap\L1CAMH38.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, suppressible by Hsap\L1CAMH38.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, suppressible | partially by Hsap\L1CAMC264Y.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, suppressible | partially by Hsap\L1CAMC264Y.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, suppressible by Hsap\L1CAM4A.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, suppressible by Hsap\L1CAM4A.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, non-suppressible by Hsap\L1CAMUAS.1180/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction phenotype, non-suppressible by Hsap\L1CAMUAS.1180/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, non-suppressible by Hsap\L1CAMH1.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, non-suppressible by Hsap\L1CAMH1.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, non-suppressible by Hsap\L1CAMH210Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, non-suppressible by Hsap\L1CAMH210Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has giant fiber neuron | adult stage phenotype, non-suppressible by Hsap\L1CAMR184Q.UAS/Scer\GAL4shot-OK307
Nrg180ΔFIGQY, Nrgl4 has adult neuromuscular junction | adult stage phenotype, non-suppressible by Hsap\L1CAMR184Q.UAS/Scer\GAL4shot-OK307
Expression of Hsap\L1CAMRSLE-.Scer\UAS under the control of Scer\GAL4OK307 suppresses the Giant Fibre (GF)-Trochanteral Muscle (TTM) synaptic defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background; there is an increase in following frequencies after a train of stimulations at 100Hz and response latency is decreased. All flies observed show TTM responses upon GF stimulation. The morphology of the synaptic terminals is restored.
Expression of Hsap\L1CAMScer\UAS.1180 under the control of Scer\GAL4OK307 does not suppress the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Expression of Hsap\L1CAMH1.Scer\UAS under the control of Scer\GAL4OK307 does not suppress the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Expression of Hsap\L1CAMH210Q.Scer\UAS under the control of Scer\GAL4OK307 does not suppress the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Expression of Hsap\L1CAMR184Q.Scer\UAS under the control of Scer\GAL4OK307 does not suppress the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Expression of Hsap\L1CAML120V.Scer\UAS under the control of Scer\GAL4OK307 significantly suppresses the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Expression of Hsap\L1CAMH38.Scer\UAS under the control of Scer\GAL4OK307 significantly suppresses the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Expression of Hsap\L1CAMC264Y.Scer\UAS under the control of Scer\GAL4OK307 significantly suppresses the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background. Half of the tested GF to TTM connections are functionally normal, while the other half are functionally impaired.
Expression of Hsap\L1CAM4A.Scer\UAS under the control of Scer\GAL4OK307 significantly suppresses the Giant Fibre (GF)-Trochanteral Muscle (TTM) synapse functional and morphological defects seen in flies expressing Nrg180ΔFIGQY in a Nrgl4 mutant background.
Nrg180ΔFIGQY rescues Nrgl4
Nrg180ΔFIGQY rescues Nrgl7
Nrg180ΔFIGQY partially rescues Nrgl4
Expression of Nrg180ΔFIGQY fully rescues Nrgl4 mutant embryonic lethality. The axonal and NMJ defects seen in Nrgl4 mutant larval motorneuron clones are only partially rescued and similar rates of innervation are seen for all four major classes of motorneurons (SNc/d, SNb, SNa and ISN) as controls.
Expression of Nrg180ΔFIGQY fully rescues Nrgl7 mutant embryonic lethality.
Expression of NrgScer\UAS.180.cEa under the control of Scer\GAL4OK307 significantly rescues the electrophysiological and morphological defects seen at the adult Giant Fibre (GF)-Trochanteral Muscle (TTMn) synapse when Nrg180ΔFIGQY is expressed in a Nrgl4 mutant background. Rescue is also seen when NrgScer\UAS.180.cEa is expressed presynaptically (Scer\GAL4c17) or postsynaptically (Scer\GAL4shakB.lethal.4.1), but not when Scer\GAL4c42.2 is expressed presynaptically only after the connection between the GF and the TTMn has been established.