Imprecise excision of the P{GawB} element in P{GawB}Trim9NP4638 resulted in a 1.2kb deletion 8bp downstream of the insertion site. A three base insertion (CAT) remains in the deleted region.
1.2 kb deletion resulting from the imprecise excision of P{GawB}Trim9NP4638, starts 8bp from insertion site and extends into Trim9 gene. Downstream breakpoint approximate.
Homozygous Trim991 third instar larvae show a marked loss of C4da commissural fascicles in the ventral nerve cord. Axonal defects are visible by embryonic stage 17.
Trim991/Df(2L)Exel8026 third instar larvae show a marked loss of C4da commissural fascicles in the ventral nerve cord. Axonal defects are visible by embryonic stage 17.
In contrast to wild type flies, almost no contralateral projections of the ddaC and vdaB axons are seen in Trim991/Df(2L)Exel8026 third instar larvae. However, the frequency of longitudinal branches is comparable to that in wild type.
3D image reconstruction shows that, as in wild type, the commissural branches in all subtypes of Trim991/Df(2L)Exel8026 C4da neurons are composed of highly branched and tangled processes. However, the wild type terminal processes are oriented almost exclusively to the medial side in all subtypes, whereas in Trim991/Df(2L)Exel8026 mutants the processes are oriented in both medial and lateral directions.
Visualisation of presynaptic terminals using Syt1Scer\UAS.T:Avic\GFP-EGFP shows that Trim991 ddaC neurons (generated using the MARCM system under the control of Scer\GAL4ppk.PG) only form synaptic connections on the ipsilateral side of the commissural branches, compared to both the ipsilateral and contralateral sides in wild type.
Homozygous Trim991 third instar larvae crawl with significantly fewer head turning behaviors compared to wild type. In addition, a concomitant increase in crawling speed is observed in Trim991 mutants.
Trim991 is partially rescued by Trim9UAS.cMa/Scer\GAL4ppk.PG
Trim991/Df(2L)Exel8026 is partially rescued by Trim9UAS.cMa/Scer\GAL4ppk.PG
Trim991/Df(2L)Exel8026 is partially rescued by Trim9UAS.ΔRING/Scer\GAL4ppk.PG
Trim991/Df(2L)Exel8026 is partially rescued by Scer\GAL4ppk.PG/Trim9UAS.ΔBB
Trim991/Df(2L)Exel8026 is not rescued by Trim9UAS.ΔCC/Scer\GAL4ppk.PG
Trim991/Df(2L)Exel8026 is not rescued by Trim9UAS.ΔFNIII/Scer\GAL4ppk.PG
Trim991/Df(2L)Exel8026 is not rescued by Trim9UAS.ΔSPRY/Scer\GAL4ppk.PG
C4da neuron-specific expression of Trim9Scer\UAS.cMa under the control of Scer\GAL4ppk.PG largely rescues the axonal defects seen in Trim991/Df(2L)Exel8026 mutants.
Expression of Trim9Scer\UAS.ΔFNIII under the control of Scer\GAL4ppk.PG is unable to rescue the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.
Expression of Trim9Scer\UAS.ΔSPRY under the control of Scer\GAL4ppk.PG is unable to rescue the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.
Expression of Trim9Scer\UAS.ΔCC under the control of Scer\GAL4ppk.PG is unable to rescue the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.
Expression of Trim9Scer\UAS.ΔBB under the control of Scer\GAL4ppk.PG partially rescues the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.
Expression of Trim9Scer\UAS.ΔRING under the control of Scer\GAL4ppk.PG partially rescues the axonal projection defects seen in Trim991/Df(2L)Exel8026 C4da neurons.
Expression of Trim9Scer\UAS.cMa under the control of Scer\GAL4ppk.PG significantly rescues the crawling behavior defects seen in Trim991 mutants.