FB2026_01 , released March 12, 2026
FB2026_01 , released March 12, 2026
Allele: Dmel\Klp61Furc-1
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General Information
Symbol
Dmel\Klp61Furc-1
Species
D. melanogaster
Name
FlyBase ID
FBal0032985
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
klp61F4
Key Links
Nature of the Allele
Progenitor genotype
Associated Insertion(s)
Cytology
Description

Insertion of four nucleotides near the start codon that shifts the translational reading frame. This is predicted to produce a truncated protein of 66 amino acids that includes the amino terminal 40 amino acids of Klp61F.

Allele components
Component
Use(s)
Inserted element
Encoded product / tool
Mutations Mapped to the Genome
Curation Data
Type
Location
Additional Notes
References
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 ( 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

The nuclear lamina in monopolar Klp61Furc-1 cells show involutions that extend towards centrally located centrosomes. Testes are not generated in Klp61Furc-1 homozygous mutants. A number of transheterozygous Klp61F07012/Klp61Furc-1 spermatocytes exhibit several small nuclei at the poles of telophase spindles and some post-meiotic spermatids also contain micronuclei. Fusiform structures, indicative of a bipolar spindle in wild-type spermatocytes are not detected in Klp61F07012/Klp61Furc-1 transheterozygote spermatocytes.

The brains of homozygous and hemizygous larvae have no anaphase figures, and an increased frequency of polyploid figures and overcondensed chromosomes compared to wild-type. 87.8% of the mitotic spindles in homozygous larval brain cells are monopolar, with the remainder being bipolar but monastral (only one half-spindle appears to be organised by a centrosome with a focus of γ tubulin). No normal biastral bipolar spindles are seen. The brains are very small compared to wild-type and there are no recognisable imaginal discs.

Primary defect is an inability of centrosomes to separate and organise a bipolar spindle. Mitotic figures are highly polyploid consisting of overcondensed chromosomes in apparent monopolar configurations.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Phenotype Manifest In
Suppressed by
Statement
Reference

Klp61Furc-1 has aster & neuroblast & larva phenotype, suppressible by ncd1

Klp61Furc-1 has spindle & neuroblast & larva phenotype, suppressible by ncd1

Enhancer of
Other
Statement
Reference

Klp61Furc-1, ncd1 has nuclear lamina & neuroblast & larva phenotype

Klp61Furc-1/Klp61F07012, ncd1 has nuclear lamina & neuroblast & larva phenotype

Additional Comments
Genetic Interactions
Statement
Reference

The reduced size of the L3-L4 intervein region (measured at the wing margin) observed in flies expressing tauScer\UAS.cMa under the control of Scer\GAL4ptc.PU is decreased further by combination with Klp61Furc-1 in heterozygous state.

Klp61F06345 ncd9/Klp61Furc-1 ncd1 adults are recovered at 28% of the frequency expected for full viability. Klp61Furc-1 ncd1 double mutants survive longer as third instar larvae and show increased cell proliferation in comparison to Klp61Furc-1 mutants. Klp61Furc-1 ncd1 cells have a monopolar organisation of chromosomes and centrosomes, showing involutions that extend towards centrally located centrosomes. Klp61F07012 ncd1/Klp61Furc-1 ncd1 cells have a monopolar organisation of chromosomes and centrosomes, showing nuclear lamina involutions that extend towards centrally located centrosomes. Biastral spindles are not found in Klp61Furc-1 mutants, but comprise more than 66% of spindles in Klp61Furc-1 ncd1 mutants.

Xenogenetic Interactions
Statement
Reference

The reduced size of the L3-L4 intervein region (measured at the wing margin) characteristic for adult flies expressing Hsap\MAPTScer\UAS.0N4R.T:Zzzz\FLAG under the control of Scer\GAL4ptc.PU is decreased further by combination with Klp61Furc-1 in heterozygous state.

The rough eye phenotype (missing interommatidial bristles) observed in adult flies expressing single copy of Hsap\MAPTScer\UAS.0N4R.T:Zzzz\FLAG under the control of Scer\GAL4GMR.PU is exacerbated further (more missing bristles, ommatidial fusion) by combination with Klp61Furc-1 in heterozygous state. The resulting phenotype is similar or even stronger than that seen in flies expressing two copies of Hsap\MAPTScer\UAS.0N4R.T:Zzzz\FLAG.

Complementation and Rescue Data
Comments
Images (0)
Mutant
Wild-type
Stocks (1)
Notes on Origin
Discoverer
Comments
Comments

Klp61F alleles form the following phenotypic series, from the most to the least severe: Klp61Furc-1 > Klp61Furc-3 > Klp61F06836, Klp61F07012 > Klp61F06345 > Klp61Furc-4.

External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (6)
Reported As
Name Synonyms
Secondary FlyBase IDs
    References (6)