FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\pbl5
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General Information
Symbol
Dmel\pbl5
Species
D. melanogaster
Name
FlyBase ID
FBal0013549
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
pbl11D
Key Links
Genomic Maps

Nature of the Allele
Progenitor genotype
Cytology
Description

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.

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

T7897878A

Reported nucleotide change:

T?A

Amino acid change:

V531D | pbl-PA; V989D | pbl-PB; V460D | pbl-PC; V918D | pbl-PD; V578D | pbl-PE; V245D | pbl-PF

Reported amino acid change:

V531D

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 ( 0 )
Disease
Evidence
References
Modifiers Based on Experimental Evidence ( 0 )
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

No significant increase in defasciculation defects in intersegmental nerve b motor axons is observed in pbl5 heterozygous embryos compared to controls.

pbl5 embryos exhibit defects in mesoderm migration (a reduction in the number of eve-positive hemisegments).

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

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

pbl5 is a non-enhancer of abnormal cytokinesis phenotype of pimIL

pbl5 is a non-enhancer of abnormal mitotic cell cycle phenotype of pimIL

Suppressor of
Statement
Reference

pbl5 is a suppressor of visible phenotype of Rho1GMR.PH

NOT Suppressor of
Statement
Reference

pbl5 is a non-suppressor of visible phenotype of RacGAP84CGAP.UAS, Scer\GAL4GMR.PU

Phenotype Manifest In
Enhanced by
Statement
Reference
NOT Enhanced by
Statement
Reference

pbl5 has centrosome phenotype, non-enhanceable by pimIL

Enhancer of
Statement
Reference
NOT Enhancer of
Statement
Reference

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

Suppressor of
Statement
Reference

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

NOT Suppressor of
Statement
Reference

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

Additional Comments
Genetic Interactions
Statement
Reference

The moderate axon pathfinding defects observed in cherQ1042X heterozygous embryos are enhanced by combination with a single copy of pbl5.

The percentage of tetranucleate early spermatids in testes from bruZ0704/bruZ3358, pbl5/pblZ4836 males is similar to that of testes from pbl5/pblZ4836 males that are heterozygous for a bru mutation, indicating a lack of genetic interaction between bru and pbl.

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.

pimIL pbl5 double mutants exhibit an increase in centrosome number per cell per cycle.

Acts as a dominant suppressor of the Rho1GMR.PH-induced rough eye phenotype.

Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Comments
Images (0)
Mutant
Wild-type
Stocks (2)
Notes on Origin
Discoverer
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (3)
References (21)