Amino acid replacement: V531D. Nucleotide substitution: GTT to GAT. The mis-sense mutation is within the most highly conserved region (CR3) of the DH Domain.
T7897878A
T?A
V531D | pbl-PA; V989D | pbl-PB; V460D | pbl-PC; V918D | pbl-PD; V578D | pbl-PE; V245D | pbl-PF
V531D
No significant increase in defasciculation defects in intersegmental nerve b motor axons is observed in pbl5 heterozygous embryos compared to controls.
pbl5 mutants exhibit an increase in centrosome number to four during the cycle following a cytokinesis failure.
Defects in cytokinesis in pbl5 homozygous embryos lead to the formation of multinucleate cells. This phenotype is fully penetrant. These embryos are defective in mesodermal migration. However, the penetrance and expressivity of this phenotype is weaker than that seen in pbl3 homozygotes: At stages 10-12, pbl5 homozygotes have an average 12 hemisegments containing eve expressing mesoderm cells (wild-type embryos have 22). A few of these embryos (2/45) even contain wild-type numbers of eve positive mesodermal cells.
pbl5 homozygous embryos exhibit cytokinesis defects and have few eve-positive dorsal mesodermal cell clusters at stage 11. This failure of dorsal mesoderm differentiation is probably due to defects in dorsal migration/spreading of the mesoderm and accompanying changes in cell morphology that can be seen at earlier stages in these embryos.
Homozygous embryos have small unelongated Malpighian tubules.
Ectodermal cells in pbl2/pbl5 embryos exhibit a failure in cytokinesis in mitotic cycle 14 resulting in the formation of polyploid multinucleate cells. Other events of the cell cycle are not affected, and during cycle 15, two mitotic figures are formed that independently enter anaphase. Affected cells fail to initiate contractile ring formation, and no sign of a cleavage furrow is seen.
Cytokinesis, but not cell progression, is prevented. Sense organ precursors differentiate predominantly into md neurons.
Neuroblast formation occurs normally in pbl mutant embryos.
Nuclei reduced in number and exhibit gross morphological alterations. Cells are multinucleate and may have more than one spindle after postblastoderm mitoses.
Cytokinesis fails although cellularization and nuclear aspects of mitosis are normal.
cold-sensitive
pbl5 has abnormal cell migration | embryonic stage phenotype, enhanceable by Scer\GAL4twi.2PE/Rac1N17.UAS
pbl5 has abnormal cell migration | embryonic stage phenotype, enhanceable by Scer\GAL4twi.2PE/Rac1V12.UAS
pbl5 has abnormal cell migration | embryonic stage phenotype, non-enhanceable by Scer\GAL4twi.2PE/Rho1V14.UAS
pbl5 has abnormal mitotic cell cycle phenotype, non-enhanceable by pimIL
pbl[+]/pbl5 is an enhancer of abnormal neuroanatomy | embryonic stage phenotype of cherQ1042X
pbl5 is a non-enhancer of abnormal cytokinesis phenotype of pimIL
pbl5 is a non-enhancer of abnormal mitotic cell cycle phenotype of pimIL
pbl5 is a non-enhancer of visible phenotype of RacGAP84CGAP.UAS, Scer\GAL4GMR.PU
pbl[+]/pbl5 is a suppressor of abnormal eye color phenotype of Hsap\MECP2R294X.UAS, Scer\GAL4GMR.PU
pbl5 is a suppressor of visible phenotype of Rho1GMR.PH
pbl5 is a non-suppressor of visible phenotype of RacGAP84CGAP.UAS, Scer\GAL4GMR.PU
pbl5 has mesoderm phenotype, enhanceable by Scer\GAL4twi.2PE/Rac1N17.UAS
pbl5 has mesoderm phenotype, enhanceable by Scer\GAL4twi.2PE/Rac1V12.UAS
pbl5 has mesoderm phenotype, non-enhanceable by Scer\GAL4twi.2PE/Rho1V14.UAS
pbl5 has centrosome phenotype, non-enhanceable by pimIL
pbl[+]/pbl5 is an enhancer of larval intersegmental nerve branch ISNb of A1-7 | embryonic stage phenotype of cherQ1042X
pbl[+]/pbl5 is an enhancer of axon | embryonic stage phenotype of cherQ1042X
pbl[+]/pbl5 is a non-enhancer of eye phenotype of Hsap\MECP2Δ166.UAS, Scer\GAL4GMR.PU
pbl5 is a non-enhancer of centrosome phenotype of pimIL
pbl5 is a non-enhancer of eye phenotype of RacGAP84CGAP.UAS, Scer\GAL4GMR.PU
pbl[+]/pbl5 is a suppressor of eye phenotype of Hsap\MECP2UAS.FL, Scer\GAL4GMR.PU
pbl5 is a suppressor of eye phenotype of Rho1GMR.PH
pbl[+]/pbl5 is a non-suppressor of eye phenotype of Hsap\MECP2Δ166.UAS, Scer\GAL4GMR.PU
pbl5 is a non-suppressor of eye phenotype of RacGAP84CGAP.UAS, Scer\GAL4GMR.PU
The moderate axon pathfinding defects observed in cherQ1042X heterozygous embryos are enhanced by combination with a single copy of pbl5.
Expression of Rac1N17.Scer\UAS under the control of Scer\GAL4twi.2PE enhances the mesodermal migration defects seen in pbl5 homozygotes.
Expression of Rac1V12.Scer\UAS under the control of Scer\GAL4twi.2PE enhances the mesodermal migration defects seen in pbl5 homozygotes.
Expression of Rho1V14.Scer\UAS under the control of Scer\GAL4twi.2PE does not enhance the mesodermal migration defects seen in pbl5 homozygotes.
Acts as a dominant suppressor of the Rho1GMR.PH-induced rough eye phenotype.