abdominal lateral pentascolopidial chordotonal organ lch5 & growth cone
Trachea are absent in homozygous trh10512 embryos, yet peripheral glial migration phenotype is normal.
trh10512 mutant clones in the distal leg are frequently associated with morphological defects in the pretarsus, such as loss of claws and malformation of the pulvilli. When large trh10512 mutant clones are generated in a Minute background loss of claws and partial ta4/ta5 fusion is seen. Clones in more proximal segments of the leg show no discernible abnormalities. No morphological defects are observed in trh10512 mutant antenna.
One third of the lateral chordotonal (lch5) neuron clusters fail to project normally beyond the TP1 choice point in trh10512 homozygous mutant embryos. In these segments the growth cones fail to leave the region of the lch5 cluster or they extend ventrally but along an aberrant route. Occasionally, the lch5 axons fasciculate with the axon of v'ch1 and contribute to the segmental nerve (SN). In most hemisegments of trh10512 mutant embryos, the lch5 axon bundle does reach the intersegmental nerve (ISN) and the morphology of the fascicle appears normal in most cases.
Salivary glands form closed sacs that are not connected to the foregut. The filzkorper do not elongate and tracheal pits do not form. The oesophagus, gastric caecae and Malpighian tubules are unaffected.
Germline clones produce eggs with patterning defects: trachea are missing.
Tracheal structures are not formed in the embryo. Phenotype is more severe than for trh1.
trh10512/trh[+] is a suppressor of larval tracheal system phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of embryonic/larval tracheal dorsal trunk phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of tracheal lumen phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of embryonic/larval tracheal lateral trunk phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of embryonic/larval dorsal tracheal branch phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of tracheal primordium phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of embryonic/larval ganglionic tracheal branch phenotype of ago3/ago1
trh10512/trh[+] is a suppressor of tracheal fusion cell phenotype of ago3/ago1
trh10512/trh[+] is a non-suppressor of embryonic/larval tracheal section phenotype of Scer\GAL4btl.PS, VhlRNAi.UAS.cMa
trh10512/+ does not lead to a significant reduction in the penetrance of Scer\GAL4btl.PS VhldsRNA.Scer\UAS tracheal phenotypes.
A. Spradling.
Complements: l(3)0596700315a. Complements: l(3)0624006240. Complements: Prm10631. Complements: l(3)neo11.
Reversion studies prove that the P{PZ} insertion is the cause of the trh10512 mutant phenotype. trh alleles fall into an allelic series. Two lethal lines were derived that complement trh mutants, along with wild type revertants and new trh alleles. From strongest to weakest: trh1 = trh8 > trh7 > trh10512 > trh6 > trh5 > trh4.