FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\parabss1
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General Information
Symbol
Dmel\parabss1
Species
D. melanogaster
Name
FlyBase ID
FBal0001325
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
bss1, parabss, bssMW1, bss
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Genomic Maps

Mutagen
    Nature of the Allele
    Mutagen
    Progenitor genotype
    Cytology
    Description

    Amino acid replacement: L1699F.

    Coordinates of lesion are relative to the para-RA/para-PA sequence.

    Nucleotide substitution: C5364T.

    Mutations Mapped to the Genome
    Curation Data
    Type
    Location
    Additional Notes
    References
    Nucleotide change:

    C16466791T

    Reported nucleotide change:

    C16360824T

    Amino acid change:

    L1699F | para-PA; L1652F | para-PAA; L1654F | para-PAB; L1652F | para-PAC; L1654F | para-PAD; L1676F | para-PAE; L1678F | para-PAF; L1657F | para-PAG; L1675F | para-PAH; L1654F | para-PAI; L1700F | para-PAJ; L1665F | para-PAK; L1679F | para-PAL; L1651F | para-PAM; L1711F | para-PAN; L1681F | para-PAO; L1665F | para-PAP; L1657F | para-PAQ; L1635F | para-PAS; L1624F | para-PAT; L1630F | para-PAW; L1667F | para-PAX; L1700F | para-PAY; L1679F | para-PAZ; L1699F | para-PB; L1700F | para-PBA; L1634F | para-PBB; L1624F | para-PBD; L1699F | para-PBF; L1699F | para-PBG; L1623F | para-PBH; L1699F | para-PC; L1682F | para-PD; L1676F | para-PE; L1676F | para-PF; L1655F | para-PG; L1665F | para-PH; L1647F | para-PI; L1668F | para-PJ; L1644F | para-PK; L1655F | para-PL; L1668F | para-PM; L1668F | para-PN; L1660F | para-PO; L1689F | para-PP; L1644F | para-PQ; L1647F | para-PR; L1668F | para-PS; L1678F | para-PT; L1686F | para-PU; L1665F | para-PV; L1670F | para-PW; L1693F | para-PX; L1706F | para-PY; L1657F | para-PZ

    Reported amino acid change:

    L1699F

    Comment:

    Location reported as an R5 coordinate.

    Variant Molecular Consequences
    Associated Sequence Data
    DNA sequence
    Protein sequence
     
    Expression Data
    Reporter Expression
    Additional Information
    Statement
    Reference
     
    Marker for
    Reflects expression of
    Reporter construct used in assay
    Human Disease Associations
    Disease Ontology (DO) Annotations
    Models Based on Experimental Evidence ( 1 )
    Modifiers Based on Experimental Evidence ( 1 )
    Disease
    Interaction
    References
    Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
     
    Disease-implicated variant(s)
     
    Phenotypic Data
    Phenotypic Class
    Phenotype Manifest In
    Detailed Description
    Statement
    Reference

    parabss1 mutant adults and third instar larvae display seizure-like behavior (temporal paralysis) induced by either vortexing or electroshock, respectively.

    parabss1/parabss1 flies are bang sensitive and have a low seizure threshold in response to high frequency stimulation (similar at room temperature or after brief heat shock). Almost two thirds of parabss1/+ heterozygotes are bang sensitive (room temperature).

    parabss1/parabss1 mutants are bang sensitive, and exhibit defects in synaptic transmission, as shown by significantly reduced response rate to GF circuit stimulation at 100 Hz.

    A majority of parabss1/+ or hemizygous parabss1 flies are bang sensitive.

    Injection of 25mM valproate saline solution greatly increases the seizure threshold of parabss1 mutants (i.e. suppresses the seizure phenotype), by a factor of 2 (but still well below wild-type levels without 25mM valproate injection).

    Homozygous parabss1 mutant flies exhibit bang-sensitive seizure-like behaviors and paralysis in response to mechanical shock. Total paralytic time is ~240 seconds, and the flies exhibit unusual tonic-clonic-like behaviors. The parabss1 mutant has a low threshold for seizure-like activity evoked by high-frequency electrical stimulation. The phenotype is semidominant; seizure-like behaviors and bang-sensitive paralysis are reduced in parabss1/+ flies, but are still seen at >95% penetrance.

    Mean recovery time from bang sensitive paralysis following a mechanical shock is approximately 240 seconds in hemizygous males and approximately 50 seconds in heterozygotes.

    Seizure-like electrical activity in the motoneurons can be elicited in hemizygous males with a high-frequency stimulus of 4.4V or higher. The seizure-like activity consists of aberrant high-frequency firing (greater than 100Hz) lasting for approximately 1 second. After this initial seizure, there is a "tonic-clonic-like" period where the giant fibre system neural circuit fails to drive muscle potentials in the dorsal longitudinal muscle and a variable number of spontaneous secondary seizures are observed. A final recovery seizure is then observed, followed by restoration of transmission in the giant fibre system shortly thereafter. In 1 day old flies, the tonic-clonic-like period is relatively short (approximately 45 seconds) and contains only one secondary seizure. In older flies (7 days after eclosion), the tonic-clonic-like period is longer (approximately 75 seconds) and typically contains 3 to 4 secondary seizures, although up to 8 have been observed.

    Seizure-like electrical activity in the motoneurons can be elicited in heterozygotes with a high-frequency stimulus of 19.1V or higher. However, in these animals, the initial seizure is followed by a synaptic failure period and then a recovery seizure, without any occurrence of secondary seizures during the synaptic failure period.

    Expression of paraGD3392 under the control of Scer\GAL4elav.PLu decreases the penetrance of the bang sensitive phenotype seen in parabss1/Y males ((from 100% to 65%) and parabss1/+ females (from 87% to 1.6%).

    Expression of paraEY08038 under the control of Scer\GAL4elav-C155 has no effect on the bang sensitive phenotype of parabss1/+ flies (P{EPgy2}paraEY08038 and parabss1 in trans).

    Flies carrying parabss1:EY08038 (P{EPgy2}paraEY08038 and parabss1 in cis), in which the mutant "bss1" form of para is being expressed under the control of Scer\GAL4elav-C155 have a more severe bang sensitive phenotype (longer mean recovery time) than flies carrying P{EPgy2}paraEY08038 and parabss1 in trans and expressing paraEY08038 under the control of Scer\GAL4elav-C155.

    Expression of two copies of paraL1699F.Scer\UAS.1-1 under the control of Scer\GAL4elav-C155 exacerbates the bang-sensitive phenotype of parabss1/+ females: the mean recovery time increases from approximately 38 to approximately 52 seconds and the seizure threshold decreases from 19.1 to 12.1V.

    Rapid acute exposure to 100% CO[[2]], N[[2]] or He causes seizure-like activity in bss1 mutants. Seizure-like activity is characterized by violent spinning of the flies accompanied by rapid uncoordinated movement of the wings, legs and abdomen. The initial bout of seizure-like activity, which usually occurs within 10 seconds of the onset of gas exposure, is followed by a period of paralysis in which the flies lay motionless. The paralysis is interrupted by bouts of delayed seizure-like activity that begins 30 to 60 seconds following the initial seizure-like activity. The delayed seizure-like activity is much more variable than the initial activity, as it often consists of multiple bouts of activity interspersed with periods of paralysis.

    Repeat exposure to CO[[2]] reduced the severity of seizure-like activity. bss1 flies that are exposed to a second round of CO[[2]] exposure as soon as they recover from an initial acute exposure to CO[[2]], a process that takes approximately 3 minutes, are immobilized by the exposure but the amount of seizure-like activity is reduced. For example, following the first exposure, 76% of bss1 flies display delayed seizure-like activity while following the second exposure only 61% of the flies display this activity.

    Five minutes after CO[[2]] induced seizure-like activity, only 6% of bss1 flies are susceptible to mechanical shock. This resistance is transient as the vast majority of flies (>95%) are once again susceptible to mechanical shock 15 minutes following CO[[2]] exposure.

    Only 8% of bss1 flies are susceptible to mechanical shock 3 minutes after N[[2]] induced seizure-like activity.

    Immediately following a mechanical shock, bss1 flies display reduced susceptibility to CO[[2]] induced seizure-like activity. As soon as these flies recover from the initial mechanical shock (a process that takes approximately 4 minutes), only 65% of the flies exhibit delayed seizure-like activity in response to acute CO[[2]] exposure.

    Exposure of bss1 flies to a 50/50 mix of CO[[2]] and O[[2]] results in initial and delayed seizure-like activity, indicating that hypercapnia is sufficient to trigger seizure-like activity in these flies as they have more than twice the level of atmospheric oxygen during exposure to the 50/50 mix. These flies are also susceptible to CO[[2]] induced anesthetization.

    Mixtures of 95% N[[2]] and 5% O[[2]] or 95% He and 5% O[[2]] do not trigger seizure-like activity in bss1 flies. In fact, at 98% N[[2]] or He and 2% O[[2]], these flies do not exhibit seizure-like activity, although they do become sluggish. When the amount of O[[2]] is reduced even further to 1% or less, the flies begin to become anesthetized and in many cases exhibit seizure-like activity.

    Exposure of bss1 to pure CO[[2]], He or O[[2]] for 2-5 minutes results in initial seizure-like activity but fails to generate the delayed seizure-like activity seen following acute exposure. After the initial seizure-like activity, the flies remain motionless throughout the duration of the 2- to 5-minute gas exposure. Once the gas exposure ends, the flies gradually recover normal function without displaying any delayed seizure-like activity.

    The giant fiber(GF)-dorsal longitudinal indirect flight muscle (DLM) neuronal circuit is more sensitive to seizure induction in mutants than in wild-type flies; seizures can be induced with high-frequency brain stimulation of shorter or less intensity in the mutant animals. The mutant animals show predominantly type II seizures.

    More than 50% of bss1/+ flies are bang sensitive. 100% of homozygous flies are bang sensitive.

    Mutants are bang-sensitive, with a recovery period of 198 +/- 45 seconds and a refractory period of 600 +/- 70 seconds. The length of the recovery period is reduced if the flies are fed potassium bromide.

    Mutant flies show a reduced seizure threshold (of 3.7 +/- 0.1 V) compared to wild type in response to high-frequency electrical stimulation. The seizure intensity is reduced if the flies are fed potassium bromide.

    On mechanical agitation, bss1 flies show a stereotypical behavioral sequence of initial spasm, paralysis, delayed spasm and recovery of normal posture. The two spasms are manifested by collapse of the body, high-frequency wing flapping, leg extension, and fully curved abdomen. Seizing females often lay eggs. Electroconvulsive stimulation delivered to the brain of bss1 flies reproducibly induces the bang-sensitive repertoire of seizure behaviour; such electroconvulsive seizures can actually be induced in wild-type flies but this requires more extreme stimulus intensities than for bss1 flies. The failure and recovery of the giant fibre (GF) pathway can be detected by recording the dorsal longitudinal muscle (DLM) physiological response. Following 1 Hz brain stimulation, bss1 mutants have a significantly longer period of DLM response failure, and have an increased sensitivity for induction of this response failure, compared to wild type. Additionally, the maximal initial discharge induction is shifted toward lower stimulus intensities in the mutant flies. Delivery of a second stimulus after the onset of the delayed discharge (DD) phase of the DLM response causes a brief suppression of DD and a slight delay in response recovery, an effect that is more pronounced in bss1 mutants than wild type. Delivery of a second stimulus after seizure recovery induces a refractory period during which DLM response failure is shortened and the DD stage is earlier and for a shorter duration; this refractory period is shorter in bss1 flies than in wild type. Additionally, bss1 flies show a rapid and abrupt restoration of full DD expression, compared to a more gradual DD restoration in wild-type. Electroconvulsive brain stimulation causes activity suppression and bursting events throughout the CNS; the period of activity suppression is longer in bss1 mutants than wild-type flies.

    The seizure threshold following short wavetrains of high-frequency electrical stimuli (0.5ms pulses at 200Hz for 300ms) is reduced in mutant flies (3.2 +/- 0.6 V) compared to controls.

    Bang-sensitive mutant. Flies usually show abnormal spontaneous activity ("seizures") in the dorsal longitudinal muscle (DLM) lasting approximately 0.5-3 seconds after the delivery of an electrical buzz (50-400 msec) to the brain. Stimulation of the giant fibre (GF) usually fails to evoke DLM potentials following the buzz. This failure lasts for 112 +/- 70 seconds. There is a close correlation between the seizure and failure phenotypes; if a seizure occurs, a failure also occurs in greater than 95% of cases, while failures without seizures occurred in approximately 10% of cases. GF evoked responses by the DLM are abnormal during recovery from the buzz. After recovery, there is a refactory period during which a buzz is less effective at inducing seizures and failures. Failures are reduced in duration if the flies are also mutant for mlenap-ts1.

    Physiological defect: a striking reduction of spike frequency in the anterior postalar (APA) and anterior notopleural (ANP) after mechanical stimulus.

    Bang sensitive paralytic mutant. Paralysis lasts for 100-400 seconds, with the length of the paralysis increasing with age. There is a subsequent refractory period of several minutes before re-paralysis is effective. The larval neuromuscular junction preparation reveals abnormal long-term facilitation, and neuronal hyperexcitability.

    External Data
    Interactions
    Show genetic interaction network for Enhancers & Suppressors
    Phenotypic Class
    Enhanced by
    NOT Enhanced by
    Statement
    Reference
    Suppressed by
    Statement
    Reference

    parabss1 has bang sensitive phenotype, suppressible by cacTS2

    parabss1 has bang sensitive phenotype, suppressible by shi1/shi1

    parabss1 has paralytic | drug conditional phenotype, suppressible by Mdr65MI00104

    parabss1 has bang sensitive | semidominant phenotype, suppressible by gish[+]/gish04895

    parabss1 has bang sensitive phenotype, suppressible by tipE1

    NOT suppressed by
    Statement
    Reference

    parabss1 has bang sensitive phenotype, non-suppressible by shi[+]/shi1

    parabss1 has bang sensitive phenotype, non-suppressible by shi1/shi2

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by gish[+]/gishKG03891

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by gish[+]/gishDG16412

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by gish[+]/gishEY06451

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by gish[+]/gishe01759

    parabss1 has bang sensitive phenotype, non-suppressible by Df(3R)ED10639/+

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by bor[+]/borc05496

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by tara1/tara[+]

    parabss1 has bang sensitive phenotype, non-suppressible by gish[+]/gish04895

    parabss1 has bang sensitive | semidominant phenotype, non-suppressible by gish[+]/gishEX04895

    parabss1 has bang sensitive phenotype, non-suppressible by tipE1

    parabss1 has abnormal behavior phenotype, non-suppressible by Df(2L)TW1/+

    parabss1 has bang sensitive phenotype, non-suppressible by Df(2L)osp29/+

    parabss1 has bang sensitive phenotype, non-suppressible by esg35Ce-1/esg[+]

    Enhancer of
    Statement
    Reference

    bss[+]/parabss1 is an enhancer of bang sensitive | recessive phenotype of kccDHS1

    parabss1 is an enhancer of abnormal neurophysiology phenotype of bas1

    parabss1 is an enhancer of paralytic phenotype of bas1

    parabss1 is an enhancer of bang sensitive phenotype of bas1

    Suppressor of
    Statement
    Reference

    parabss1/parabss1 is a suppressor of abnormal neurophysiology | adult stage | temperature conditional phenotype of cacTS2

    parabss1/parabss1 is a suppressor of paralytic | adult stage | temperature conditional phenotype of cacTS2

    Other
    Phenotype Manifest In
    Enhanced by
    NOT Enhanced by
    Suppressed by
    Enhancer of
    Statement
    Reference
    Other
    Additional Comments
    Genetic Interactions
    Statement
    Reference

    parabss1/+ double mutants exhibit spontaneous seizures.

    Expression of pumScer\UAS.cSa under the control of Scer\GAL4ChAT.7.4 or Scer\GAL4elav.PLu fully suppresses the seizure-like phenotype (temporal paralysis) observed in parabss1 mutant males subjected to brief vortexing or in mutant third instar larvae upon an electroshock and their recovery time is comparable to that of wild-type controls. In contrast, Scer\GAL4ChAT.7.4-driven expression of pumKK109048 worsens the paralytic phenotype in both adults and larvae and further delays recovery. Similarly, expression of pumScer\UAS.cSa driven by Scer\GAL4elav.PLu significantly reduced while expression of pumKK109048 increased the seizure duration in parabss1 larvae.

    parabss1 mutant larvae expressing pumScer\UAS.cSa in the aCC motoneuron controlled by Scer\GAL4eve.RRa show a striking reduction in the persistent voltage-gated Na[+] current (I[[NaP]]) in the aCC but no significant change in the transient voltage-gated Na[+] current (I[[NaT]]) relative to parabss1 mutants alone, therefore the persistent-to-transient ration is markedly decreased, consistent with the presumed anticonvulsant role of pum upregulation. On the other hand, pumKK109048 driven by the same driver has no effect on I[[NaP]] and although I[[NaT]] is mildly increased, the P:T ratio is unchanged and no difference in the severity of the seizure phenotype is observed compared to parabss1 larvae. On occasion, multiple resurgent currents appear during the I[[NaP]] plateau in parabss1 larvae and the proportion of cells showing these are decreased upon pumScer\UAS.cSa expression.

    cacTS2/Y (or even more so, cacTS2/cacTS2) mostly suppresses bang sensitivity (reduces behavioral paralysis) in parabss1/parabss1 flies at room temperature; this suppression is increased (almost total) after brief heat shock. cacTS2/cacTS2) almost completely suppresses bang sensitivity (reduces behavioral paralysis) in parabss1/+ flies at room temperature. cacTS2/Y also speeds recovery time from paralysis and reduces refractory time in parabss1/parabss1 flies.

    After brief heat shock, cacTS2/Y transiently suppresses the low seizure threshold in parabss1/parabss1 flies, even increasing the threshold to above wild type levels (seizure resistance); the seizure threshold returns to parabss1/parabss1 levels after some minutes at room temperature.

    cacJF02572 driven by Scer\GAL4elav-C155 partially suppresses bang sensitivity (reduces behavioral paralysis) in parabss1/Y flies at room temperature.

    parabss1/parabss1 suppresses the spontaneous seizure-like activity in the dorsal longitudinal muscle as well as behavioural paralysis seen at higher restrictive temperatures (38C) in cacTS2/cacTS2 flies.

    shi1/shi1 does not rescue the bang sensitive phenotype of parabss1/parabss1 mutants at 23[o]C, but if incubated for 3 minutes at 27[o]C immediately before testing, partially rescues the bang sensitive phenotype of parabss1/parabss1 mutants.

    shi1/+ or shi1/shi1 or shi1/shi2 does not significantly rescue the bang sensitive phenotype of parabss1/+ mutants at 23[o]C.

    Expression of shits1.IVS.p10.20xScer\UAS or shi1.Scer\UAS under the control of Scer\GAL4GMR57C10 partially suppresses the bang sensitivity of hemizygous parabss1 flies when incubated for 3 min at 28[o]C, but not at 23[o]C.

    Expression of shits1.IVS.p10.20xScer\UAS under the control of Scer\GAL4GMR57C10 or Scer\GAL4elav-C155 partially suppresses the bang sensitivity of parabss1/+ flies at 23[o]C or 30[o]C, but not at 18[o]C.

    Expression of shits1.IVS.p10.20xScer\UAS under the control of Scer\GAL4GMR57C10 increases the seizure threshold of parabss1/+ flies at 23[o]C.

    shi1.Scer\UAS under the control of Scer\GAL4GMR57C10 partially suppresses the bang sensitivity of parabss1/+ flies at 23[o]C.

    shits1.IVS.p10.20xScer\UAS under the control of Scer\GAL4ChAT.PU partially suppresses the bang sensitivity, and increases the seizure threshold of parabss1/+ flies at 23[o]C, and partially rescues the bang sensitivity of hemizygous parabss1 flies temperature shifted to 28[o]C.

    shits1.IVS.p10.20xScer\UAS under the control of Scer\GAL4RapGAP1-OK6 partially rescues the bang sensitivity, but does not significantly change the seizure threshold of parabss1/+ flies at 23[o]C; and does not rescue the bang sensitivity of hemizygous parabss1 flies temperature shifted to 28[o]C.

    shits1.IVS.p10.20xScer\UAS under the control of Scer\GAL4shot-OK307 does not rescue the bang sensitivity, and does not significantly change the seizure threshold of parabss1/+ flies at 23[o]C; but partially rescues the bang sensitivity of hemizygous parabss1 flies temperature shifted to 28[o]C.

    parabss1 mutants expressing shits1.IVS.p10.20xScer\UAS under the control of Scer\GAL4shot-OK307 display synaptic transmission defects and a higher seizure threshold when heated, as compared with controls.

    Expression of Rab5Q88L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab8T22N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab9S26N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab9Q71L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab30T21N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab30Q66L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab32T33N.Scer\UAS.P\T.T:Avic\GFP-YFP, or Rab35S22N.Scer\UAS.T:Avic\GFP-YFP under the control of Scer\GAL4GMR57C10 partially rescues the bang sensitivity of parabss1/+ flies, but does not rescue the bang sensitivity of hemizygous parabss1 flies.

    Expression of Rab3T35N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab3Q80L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab5S43N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab8Q67L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab23S51N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab23Q96L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab27T25N.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab27Q74L.Scer\UAS.P\T.T:Avic\GFP-YFP, Rab32Q79L.Scer\UAS.P\T.T:Avic\GFP-YFP, or Rab35Q67L.Scer\UAS.P\T.T:Avic\GFP-YFP under the control of Scer\GAL4GMR57C10 does not rescue the bang sensitivity of parabss1/+ flies or hemizygous parabss1 flies.

    A Mdr65MI00104 background does not affect the seizure phenotype found in parabss1 flies that have been injected with 15mM valproate saline solution. However, the seizure phenotype found in parabss1; Mdr65MI00104 flies that have been injected with 25mM valproate saline solution is considerably higher, and above the wild-type range, indicating some protection conferred by an interaction in the double mutant.

    The severity of the bang-sensitive phenotype seen in parabss1/Y is exacerbated with one copy of any of Df(2R)Exel7135, Df(2R)Exel6078, Df(2R)Exel6056, Df(2R)Exel7094, Df(2R)Exel6071 or Df(2R)BSC651. No enhancement is seen with heterozygous Df(2R)BSC346.

    Expression of chnKK105251 under the control of Scer\GAL4elav-C155 increases the length of the recovery time in parabss1/Y flies. The threshold for seizure initiation is not affected.

    No bang sensitivity is seen in flies expressing chnKK105251 under the control of Scer\GAL4elav-C155 in a parabss1/+ mutant background.

    The bang sensitive phenotype seen in parabss1/+ mutant females can be suppressed by one copy of any of Df(2R)Exel6285, Df(3R)ED10639, Df(3L)ED224, Df(3L)ED201, Df(3L)ED4502, Df(2R)BSC427, Df(3R)ED5518, Df(3L)ED4486 or Df(3R)Exel7329. No suppression is seen in a Df(3R)Exel6269/+ background. One copy of Df(3R)ED10639 almost completely rescues the low threshold for seizure-like activity seen in parabss1/+ flies. A Df(3R)ED10639/+ background does not suppress the bang sensitive phenotypes, or seizure recovery time in parabss1/parabss1 or parabss1/Y mutant flies.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of borc05496.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of tara1.

    The bang sensitive phenotype seen in parabss1/+ mutant females can be partially suppressed with one copy of gish04895. Fewer flies exhibit bang-sensitivity and the threshold for seizure-like activity is partially rescued. A gish04895/+ background does not suppress the bang sensitive phenotypes in parabss1/parabss1 or parabss1/Y mutant flies.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of gishEX04895.

    Expression of gishGD10588 under the control of Scer\GAL4elav-C155 partially suppresses the bang sensitive phenotype seen in parabss1/+ mutant females. Fewer flies exhibit bang-sensitivity and the threshold for seizure-like activity is partially rescued. gishGD10588 does not suppress the bang sensitive phenotypes in parabss1/parabss1 or parabss1/Y mutant flies.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of gishKG03891.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of gishDG16412.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of gishEY06451.

    The bang sensitive phenotype seen in parabss1/+ mutant females is not suppressed by one copy of gishe01759.

    Expression of arrGD2617 under the control of Scer\GAL4elav-C155 does not significantly suppress the bang sensitive phenotype seen in parabss1/+ mutant females.

    The penetrance of the bang sensitive phenotype seen in parabss1/+ females is significantly reduced compared to controls in parabss1/+ tipE1/+ females and is reduced even further in parabss1/+ tipE1/tipE1 females. However, bang sensitive phenotype seen in parabss1/Y males is not suppressed in parabss1/Y tipE1/tipE1 males.

    Expression of kccScer\UAS.cHb driven by Scer\GAL4c739 significantly suppresses the bang-sensitive paralytic phenotype of bss1 mutants.

    Df(2L)TW1/+ does not significantly alter the seizure phenotype of bss1 hemizygotes.

    Unlike either heterozygote alone, a bang sensitive phenotype is seen in kccDHS1/+; bss1/+ adults (penetrance 48%). The penetrance of this phenotype rises to 77% in kccDHS1/kccDHS1; bss1/+ adults.

    The bang sensitivity of bss1/+ flies (more than 50% of flies are bang sensitive) is substantially suppressed by the expression of one of esgEP684, esgEP2009 or esgEP633 under the control of Scer\GAL4elav.PLu. However, the 100% bang sensitivity of bss1/bss1 flies is not suppressed by the expression of one of esgEP684, esgEP2009 or esgEP633 under the control of Scer\GAL4elav.PLu. The bang sensitivity of bss1/+ flies is partially suppressed by the expression of one of snaScer\UAS.cFa or esgScer\UAS.cFa under the control of Scer\GAL4elav.PLu. The bang sensitivity of bss1/+ flies is not significantly altered by esg35Ce-1/+ or Df(2L)osp29/+.

    Following mechanical agitation, bss1 bas1 double mutant flies have a prolonged paralysis and take longer to recover following spasm than single mutants. These double mutants also have an enhanced susceptibility to electroconvulsion compared to single mutants with a prolonged DLM response failure. The sensitivity for response failure induction and maximal initial discharge induction is similar in the double mutants to bss1 single mutants. Delivery of a second stimulus after the onset of DD causes a greater suppression of DD and a more delayed response recovery in double mutants than either single mutant. Additionally, delivery of a second stimulus after seizure recovery induces a shorter refractory period in bss1 bas1 double mutants. The jump muscle TTMs have an earlier response recovery following electroconvulsive stimuli, compared to DLMs; this effect is much more pronounced in bss1 bas1 mutants than in wild-type flies. Gynandromorph analysis shows that the recovery time of DLM responses to test stimuli applied to the brain is progressively lengthened as the number of bss1 bas1 mutant neurons in the GF pathway increases.

    mlenap-ts1 suppresses the reduced seizure threshold of bss1 flies following high-frequency electrical stimuli, raising the seizure threshold to wild-type levels in the double mutant flies.

    shakB2 does not suppress the reduced seizure threshold of bss1 flies following high-frequency electrical stimuli. However, the double mutants do show a significant increase in the latency to seizure onset following 4V high-frequency stimuli compared to bss1 single mutants. The double mutants show a reduction in spontaneous seizures during recovery from 4V high-frequency stimuli compared to bss1 single mutants.

    The threshold for activation of the giant fiber in mutant animals following single stimulus pulses (0.2ms duration, 0.5Hz) is not significantly different from that of wild type.

    The threshold for activation of the giant fiber in bss1 mlenap-ts1 animals following single stimulus pulses (0.2ms duration, 0.5Hz) is elevated compared to wild type.

    Xenogenetic Interactions
    Statement
    Reference
    Complementation and Rescue Data
    Comments

    paraShu/parabss1 transheterozygous female adults reared at 25[o]C temperature exhibit strong decreases in wing posture defects and in the movement time spent in the centre of a circular space, as compared to paraShu heterozygous females.

    Expression of paraScer\UAS.1-1 under the control of Scer\GAL4elav-C155 suppresses the bang sensitive phenotype seen in parabss1/+ females (the phenotype is completely suppressed when two copies of paraScer\UAS.1-1 are used).

    Expression of paraScer\UAS.1-1 under the control of Scer\GAL4elav-C155 is also effective at rescuing the bang sensitive phenotype seen in parabss1/Y males (the penetrance of the phenotype is reduced and the seizure threshold is significantly increased).

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    Mutant
    Wild-type
    Stocks (1)
    Notes on Origin
    Discoverer
    Comments
    Comments

    Complements: Dsp11. Dsp11 complements the bang sensitive paralysis of bss1; the phenotype of bss1/Dsp11 flies is the same as that of +/bss1 flies.

    Phenotype suppressed by mlenap-ts1, even at permissive temperatures. Double mutants do not pass out even when they are vibrated on the vortex mixer twice the usual amount of time. Double mutants have normal nerve activity and ejp.

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    Synonyms and Secondary IDs (8)
    References (46)