As a result of an insertion of the 5' portion of a roo transposon into intron 6, there is no splicing at the exon 6-intron 6 junction. The insertion is located 43bp downstream of the splice donor junction, and results in transcriptional termination and polyadenylation of the DAT mRNA within the inserted segment. As a result of an in-frame stop codon in intron 6, the DAT protein is truncated at amino acid 343 in DATfmn, whereas wild-type DAT is 632 amino acids in length.
Expressing Hsap\SLC6A3R445C.UAS under the control of Scer\GAL4ple.PF in DATfmn homozygotes leads to a decrease in spontaneous walking activity and decreased movement vigor; increased in flight initiation duration; and increase in grooming time. There is a decrease in the number of PPL1 DA neurons.
DATfmn mutants adults display increase in baseline activity but the frequency of high-intensity activity bursts is the same as in wild-type controls.
Compared to wild-type control, the DATfmn mutants show significant decrease in overall grooming frequency after 15 min period of acclimatization in the experimental arena. They also display lower frequency in head/eye grooming right after introduction to the experimental chamber although the overall grooming frequency during this initial period is not significantly changed. The duration of activity bouts representing grooming however is significantly shorter both during the initial period and after acclimatization.
Sensitivity to ethanol-induced sedation is not affected in DATfmn mutant adults.
DATfmn mutant heterozygotes show a reduction in daily sleep.
Odor-evoked neurophysiology responses (measured by "sytGCaMP" fluorescence) across the gamma Kenyon cells is significantly altered in DATfmn mutants compared to controls.
Both both young (1 day) and mature (7-8 day) DATfmn mutant flies show reduced sleep compared to controls but the increased amount of sleep normally seen in young flies is still observed.
Sleep latency is normal in mutant flies.
DATfmn flies are hyperactive.
Mutant flies have normal mushroom body morphology.
Mutant flies have reduced sleep duration compared to controls.
DATfmn homozygous mutant flies are grossly normal for motor behaviours and exhibit a normal olfactory startle response. Ethanol-induced hyperactivity is markedly reduced in these mutants.
DATfmn mutants are active almost continuously throughout the day (compared to wild-type flies). Although DATfmn flies display high levels of locomotor activity at all times of the cycle, they nonetheless show rhythmic circadian changes in activity levels for the first two days of DD. However, free-running activity rhythms are not as robust as those seen in the wild-type because of the relatively high baseline level of activity in DATfmn mutants observable at all times of subjective day.
On average, DATfmn mutants show a twofold to threefold increase in total daily activity in LD and DD compared with control flies.
DATfmn mutants exhibit significantly less rest than control flies. However, the activity index, defined as the total daily activity divided by the length of the daily active period, is similar in DATfmn flies and control flies. This inidctaes that DATfmn mutants are hyperactive becuase they have a longer period of daily activity rather than being more active during any given activity period. This increased activity is a result of decreased rest period duration and increased lengths of activity in DATfmn mutants, both in LD and DD conditions.
Both male and female DATfmn mutants exhibit normal lifespans compared with genetic background controls. Furthermore, the mutant has no obvious morphological, developmental, or fertility phenotypes.
DATfmn flies are hyper-responsive to mechanical stimuli compared with control flies, with the greatest difference observed at the weakest stimuli tested. Only 15% of control flies respond to mild stimuli, but in the sames, 49% of DATfmn mutants exhibit a response. A similar differential effect is found with moderate stimuli (responses by 48% of control and 88% of DATfmn), whereas all mutant and control flies respond to strong stimuli. In addition, the response of DATfmn flies is lenghtened relative to controls.
DATfmn flies deprived of rest for 2, 4, or 6 hours during the subjective night exhibit an attenuated rest rebound, indicating that altered synaptic dopamine has perturbed the homeostatic regulation of the rest/activity profile.
DATfmn has abnormal locomotor behavior | adult stage phenotype, non-enhanceable by per01/per01
DATfmn has abnormal sleep | dominant phenotype, non-enhanceable by CycAC8LR1/CycA[+]
DATfmn has increased rate of movement | adult stage phenotype, suppressible by Hsap\SLC6A3UAS.cHa/Scer\GAL4ple.PF
DATfmn has increased rate of movement | adult stage phenotype, suppressible by Scer\GAL4ple.PF/Hsap\SLC6A3KA.UAS
DATfmn has abnormal locomotor behavior phenotype, suppressible | partially by Hsap\SLC6A3UAS.cHa/Scer\GAL4ple.PF
DATfmn has abnormal locomotor behavior | adult stage phenotype, non-suppressible by per01/per01
DATfmn is a non-suppressor of chemical resistant | adult stage phenotype of DopEcRGAL4
DATfmn, Hsap\SLC6A3R445C.UAS, Scer\GAL4ple.PF has abnormal locomotor behavior | adult stage phenotype
DATfmn, Hsap\SLC6A3R445C.UAS, Scer\GAL4ple.PF has abnormal flight phenotype
DATfmn, Hsap\SLC6A3R445C.UAS, Scer\GAL4ple.PF has abnormal grooming behavior phenotype
DATfmn, Hsap\SLC6A3R445C.UAS, Scer\GAL4ple.PF has decreased cell number | adult stage phenotype
DATfmn, GabatPL00338 has lethal phenotype
DATfmn, Gabatf01602 has abnormal sleep phenotype
DATfmn, Hsap\SLC6A3R445C.UAS, Scer\GAL4ple.PF has dopaminergic PPL1 neuron | adult stage phenotype
The increased resistance to ethanol-induced sedation characteristic for DopEcRGAL4 homozygous adults is weakly suppressed by combination with Dop1R1PL00420.
DATfmn/DATfmn;GabatPL00338/GabatPL00338 double mutants are homozygous lethal.
DATfmn/DATfmn;Gabatf01602/Gabatf01602 double mutants sleep significantly more than DATfmn/DATfmn flies; this increase in sleep is mostly during the day time and sleep in the double mutants is more fragmented than in DATfmn/DATfmn flies (largely due to increases in bout number). Gabatf01602/Gabatf01602 rescues sleep latency defects DATfmn/DATfmn flies, though not other aspects of sleep architecture.
DATfmn/+ ; wakeGS17103/+ and DATfmn/+ ; Rdl1/+ double heterozygotes show no significant change in sleep latency compared to controls.
Double heterozygous TorsinKO13/+; DATfmn/+ female larvae show a similar peristaltic frequency as either single heterozygote, and the DATfmnallele has no effect on the mobility of TorsinKO13/Y males.
The hyperactivity characteristic for DATfmn adult mutants is suppressed by expression of either Hsap\SLC6A3Scer\UAS.cHa or Hsap\SLC6A3KA.Scer\UAS under the control of Scer\GAL4ple.PF. The circadian rhythm of the locomotor activity of DATfmn flies is not perturbed by expression of either of the transgenes.
Selective expression of Hsap\SLC6A3Scer\UAS.cHa in DA neurons (under the control of Scer\GAL4ple.PF) significantly reduces the hyperactivity found in DATfmn flies.
Selective expression of Hsap\SLC6A3T356M.Scer\UAS in DA neurons (under the control of Scer\GAL4ple.PF) reduces the hyperactivity found in DATfmn flies, although to a much lesser extent than through expression of Hsap\SLC6A3Scer\UAS.cHa.
DATfmn is partially rescued by Scer\GAL4elav-C155/DATUAS.cKa
Expression of DATScer\UAS.cKa pan-neuronally, under the control of Scer\GAL4elav-C155 partially rescues the DATfmn phenotype (i.e. they exhibit decreased daily activity and prolonged sleep periods).