Homozygous Atpα2206 mutants exhibit complete paralysis for >5 seconds after mechanical stress (10s vortex), after which animals slowly right themselves. Once Atpα2206 mutants achieve a standing position they are markedly sluggish for 1 to 3 minutes, grooming infrequently.
In Atpα2206 mutants, the neuromuscular junction displays a 40% increase in bouton number.
Evoked synaptic transmission and synaptic current amplitude is not significantly different in Atpα2206 mutants compared to controls. mEJC frequency in Atpα2206 mutants is more than doubled compared to controls, indicating a marked increase in presynaptic vesicular release probability. The average mEJC amplitudes in Atpα2206 mutants is not significantly different from controls, indicating normal postsynaptic responses to individual quanta. The distribution of mEJC amplitudes is unaltered. Elevation of "["Ca[2+]"]" to 2.0mM causes mEJC frequency and amplitude to increase as in controls.
Atpα2206 mutants show synaptic fatigue properties indistinguishable from wild-type.
Atpα2206 mutants do not exhibit significant attenuation in transmission amplitude compared to wild-type. The frequency of synaptic failures increases from zero at basal stimulation frequencies (0.5Hz) to over 50% after 3.5mins of 25Hz high frequency stimulation. Atpα2206 NMJs exhibit a 25-fold increase in synaptic transmission failure frequency compared to very infrequent failure in wild-type.
Atpα2206 neurotransmission shows slightly impaired recovery from high-frequency stimulation-induced fatigue but is not significantly different from controls.
In 2.0mM Ca[2+] saline, electrotonically elicited peak amplitudes are more than twofold larger in Atpα2206 mutants than in controls.
During high-frequency electrotonic stimulation, Atpα2206 EJC amplitudes appear the same as controls.
Using physiological extracellular "["Ca[2+]"]" (2.0mM), mEJC frequency is increased in Atpα2206 mutants compared to controls.
Atpα2206 mutants show significantly increased mEJC frequencies at all "["Ca[2+]"]", compared to wild-type controls.
Atpα2206 mutants are insensitive to activity-dependent mEJC amplitude modulation.
Pre-synaptic vesicle endocytosis/exocytosis cycling is normal in Atpα2206 mutants.
Atpα2206 adults are short lived and the brains of their middle-aged adults exhibit neurodegeneration, given the appearance of sporadically localized vacuolar pathology throughout the brain, which are rarely seen in controls.
Homozygous flies are hypersensitive to ouabain in a feeding assay. Atpα2206 homozygotes that are also expressing AtpαD369N.hs are more sensitive to ouabain in a feeding assay than Atpα2206 homozygotes which do not carry AtpαD369N.hs. Atpα2206 homozygotes are paralysed for approximately 8 seconds following vigorous mechanical stimulation. This paralytic period is not altered following heat treatment. Atpα2206 homozygotes that are also expressing AtpαD369N.hs take longer to recover following paralysis than Atpα2206 homozygotes which do not carry AtpαD369N.hs. Atpα2206 homozygotes are less active than wild-type flies in a reactive climbing assay. This defect is more severe if the flies are also expressing AtpαD369N.hs.
Demonstrates bang sensitivity. Vortexing for 10 seconds causes 5-10 sec paralysis proceeding through staggering to normal behaviour over the course of 1-2 mins.
Bang-sensitive mutant. Stimulation of the giant fibre (GF) can fail to evoke DLM potentials following the delivery of an electrical buzz (50-400 msec) to the brain. This failure lasts approximately 30 seconds.
When flies are repeatedly knocked to the bottom of the vial they respond by going into paralysis for several seconds after which they recover completely. Flies vortexed for 10 seconds are paralysed for 5-10 seconds. Greater sensitivity to ouabain compared to wild type and a reduction in Na+ pump activity.
Atpα2206 has paralytic | conditional phenotype, suppressible by sesB1/sesB[+]
Atpα2206 has paralytic | conditional phenotype, suppressible by parats1
Atpα2206/Atpalpha[+] is a suppressor | partially of paralytic | conditional phenotype of sesB1
Atpα2206 is not rescued by AtpαD369N.hs
Atpαhs.PS partially rescues the ouabain sensitivity of Atpα2206 homozygotes. Atpα2206 homozygotes that are also expressing Atpαhs.PS recover more quickly following paralysis (induced by vigorous mechanical stimulation) than Atpα2206 homozygotes which do not carry Atpαhs.PS. The activity defects in a reactive climbing assay that are seen in Atpα2206 homozygotes are rescued if they are also expressing Atpαhs.PS.
Mobilisation of the P{PZ} insertion demonstrates it to be the cause of the bang sensitive phenotype and greater sensitivity to ouabain.