Chats1/Df(3R)Cha5 flies raised at 18oC and then transferred to 30oC can stand and walk around after 1 day at 30oC. The flies are all paralysed after 3 days at 30oC. Short-latency responses to a single stimulation of the giant fiber are observed in the tergotrochanteral muscle (TTM) but not the dorsal longitudinal muscle (DLM) of Chats1 flies kept at the restrictive temperature.
Monoclonal antibodies to CHA recognise a protein of wild-type molecular weight (80kD) but, even at the permissive temperature, in lesser amounts than in the wild-type.
Homozygous flies become paralysed and subsequently die at the restrictive temperature. Homozygotes show late embryonic lethality when kept at the restrictive temperature from the beginning of development.
Expression of ChaScer\UAS.T:Avic\GFP under the control of Scer\GAL4Cha.7.4 rescues the recessive lethality of Chats1.
The order for phenotypic severity for temperature-sensitive paralysis in adults is: Chats3 > Chats2 > Chats1.
Shows normal GABA staining in stage 17 nerve cord.