FB2024_03 , released June 25, 2024
Allele: Dmel\trol13
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General Information
Symbol
Dmel\trol13
Species
D. melanogaster
Name
FlyBase ID
FBal0017058
Feature type
allele
Associated gene
Associated Insertion(s)
Carried in Construct
Also Known As
trolb22, l(1)zw1b22
Key Links
Mutagen
Nature of the Allele
Mutagen
Progenitor genotype
Cytology

Polytene chromosomes normal (Judd).

Description

Single nucleotide deletion at position 1181 of the putative mRNA results in a frameshift. This is predicted to reduce the size of the protein product from 450kD to 400kD.

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 ( 0 )
Disease
Interaction
References
Comments on Models/Modifiers Based on Experimental Evidence ( 0 )
 
Disease-implicated variant(s)
 
Phenotypic Data
Phenotypic Class
Phenotype Manifest In

larval brain & neuroblast

Detailed Description
Statement
Reference

trol13 homozygotes have normal numbers of S phase larval neuroblasts per brain lobe.

trol13/Y males are about 71% viable compared to wild-type males at 25oC. Hemizygous trol13 male larvae have a normal number of S phase neuroblasts per brain lobe.

Normal larval brain histology. Male adult escapers have a roughened eye phenotype: irregular packing and size of ommatidia, aberrant bristle placement and number. Gynandromorph analysis shows the brain phenotype is due to misrotation of the optic lobes and misrouted retinula or lamina fibres. Hemizygous males and homozygous females show reduced flight/escape response.

Lethality occurs during larval and pupal stages. The growth rate begins to decrease during the second larval instar. Mosaic analysis demonstrates mutant phenotype is non-autonomous.

External Data
Interactions
Show genetic interaction network for Enhancers & Suppressors
Phenotypic Class
Enhanced by
Statement
Reference

trol13 has lethal phenotype, enhanceable by eve10-5/eve[+]

trol13 has lethal phenotype, enhanceable by eve[+]/eve20-35

trol13 has lethal phenotype, enhanceable by eve58-11/eve[+]

trol13 has partially lethal - majority die phenotype, enhanceable by eve[+]/eve5

trol13 has partially lethal - majority die phenotype, enhanceable by eve[+]/eve1

trol13 has partially lethal - majority die phenotype, enhanceable by eve3/eve[+]

trol13 has partially lethal - majority die phenotype, enhanceable by eve[+]/eve4

NOT Enhanced by
Statement
Reference

trol13 has lethal phenotype, non-enhanceable by eve14-10/eve[+]

Suppressed by
NOT suppressed by
Statement
Reference

eve3/eve[+], trol13 has lethal phenotype, non-suppressible by CycEhs.PR

Other
Phenotype Manifest In
Enhanced by
Statement
Reference

trol13 has neuroblast | larval stage phenotype, enhanceable by btlLG19/btl[+]

trol13 has neuroblast | larval stage phenotype, enhanceable by hh[+]/hh2

trol13 has neuroblast | larval stage phenotype, enhanceable by hh[+]/hhAC

trol13 has neuroblast | larval stage phenotype, enhanceable by bnl06916/bnl[+]

trol13 has phenotype, enhanceable by eve6

trol13 has phenotype, enhanceable by eve5

NOT Enhanced by
Statement
Reference

trol13 has neuroblast | larval stage phenotype, non-enhanceable by htlAB42/htl[+]

Suppressed by
Statement
Reference

eve3/eve[+], trol13 has larval brain & neuroblast phenotype, suppressible by CycEhs.PR

Suppressor of
Statement
Reference

trol13/trol13 is a suppressor of neuroblast | larval stage | heat sensitive phenotype of hhts2

Other
Statement
Reference

eve3, trol13 has larval brain & neuroblast phenotype

eve3/eve[+], trol13 has larval brain & neuroblast phenotype

eve4, trol13 has larval brain & neuroblast phenotype

eve5, trol13 has larval brain & neuroblast phenotype

Additional Comments
Genetic Interactions
Statement
Reference

trol13/trol13; bnl06916/+ and trol13/trol13; btlLG19/+ larvae, but not trol13/trol13; htlAB42/+ larvae have reduced numbers S phase neuroblasts per brain lobe compared to trol13 homozygotes. trol13/trol13; larvae, heterozygous for hh2or hhAC have reduced numbers S phase neuroblasts per brain lobe compared to trol13 homozygotes. trol13/trol13; heterozygous for hh21 have increased numbers of S phase neuroblasts per brain lobe compared to trol13 homozygotes.

96% of trol13/Y ; eve3/+ animals show defective proliferation of larval brain neuroblasts. The addition of CycEhs.PR (without heat shock) reduces the number of animals with defective proliferation to 35%, and expression of CycEhs.PR using a 30 minute heat shock rescues the neuroblast phenotype almost completely. Weak induction of CycEhs.PR does not rescue the enhanced lethality of trol13/Y ; eve3/+ animals. trol13/Y ; eve3/+ brains cultured in an explant assay in larval extract from eve3/+ or trol13/Y ; eve3/+ animals show a reduced amount of proliferation compared to wild-type brains cultured in larval extract from wild-type animals. In contrast, trol13/Y ; eve3/+ brains cultured in larval extract from wild-type animals have a level of proliferation close to that seen in controls (wild-type brains cultured in larval extract from wild-type animals). No trol13 brains cultured in larval extract from eve3/+ animals show normal proliferation. Addition of ecdysone rescues defective proliferation in trol13/Y ; eve3/+ brains cultured in larval extract from trol13/Y ; eve3/+ animals.

The trol13/Y semi-lethality is dominantly enhanced by Df(2R)X1, Df(2R)B5 or Df(2R)eve. These deficiences also show a strong transheterozygous effect in trol13/+ females, resulting in a reduction in viability. The semi-lethality is not dominantly enhanced by Df(2R)stan2. The semi-lethality of trol13/Y males is also dominantly enhanced by eve5, eve1, eve3 and eve4 and these alleles also show a transheterozygous effect in trol13/+ females, resulting in a reduction in viability. trol13/Y males carrying evetPa show reduced viability compared to control siblings. If the trol13 larvae are also heterozygous for either eve3 or eve4 then the number of S phase neuroblasts per brain lobe is reduced. If the trol13 larvae are also heterozygous for eve5, then the number of S phase neuroblasts per brain lobe is reduced in 66% of larvae and unaffected in 33% of larvae.

Xenogenetic Interactions
Statement
Reference
Complementation and Rescue Data
Images (0)
Mutant
Wild-type
Stocks (2)
Notes on Origin
Discoverer

Judd, 22 Feb. 1962.

Comments
Comments

Shows no maternal-zygotic interaction.

Heteroallelic combinations are fully lethal.

External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (8)
References (15)