FB2026_03 , released September 17, 2026
Recombinant Construct: P{JBβX}
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General Information
Symbol
P{JBβX}
FlyBase ID
FBtp0006275
Feature type
transgenic_transposable_element
Component Allele(s)
janBJBβX.lacZ
Size
Expression Data
Associated insertion(s)
1 available
Molecular map
Description and Uses
Construct components
Component
Use(s)
Marker(s)
ry+t7.2
Component allele janBJBβX.lacZ
Transgenic product class
Component
Use(s)
Regulatory region(s)
janB_JBbetaX
Encoded product / tool
janB
Tagged with
lacZ
Description

A genomic fragment extending from -3250 to +271 relative to the janB transcription start site is fused upstream of lacZ. The genomic fragment also includes the janA and Sry-β transcription units, and a 5' portion of the Sry-α transcription unit.

(Yanicostas and Lepesant, 1990)
Sequence Data
Sequence (FB)
Associated Sequence Data
DDBJ / EMBL / GenBank
DNA Sequence
Extent
Segments and Size
Total Size
Left end
Right end
 
Segments
Num
Orientation
Symbol
Reference
Phenotypic Data
Expression Data
Reporter Expression
northern blot
Stage
Tissue/Position (including subcellular localization)
Reference
third instar larval stage
organism

Comment: male

(Yanicostas and Lepesant, 1990)
adult stage | male
(Yanicostas and Lepesant, 1990)
spermatogenesis & adult stage
testis | restricted
(Yanicostas and Lepesant, 1990)
spermatocyte
(Yanicostas and Lepesant, 1990)
Additional Information
Statement
Reference

The expression pattern of this construct resembles that of endogenous janB. Transcript is first detected in spermatocytes, and signal increases during spermatocyte growth. Signal decreases sharply after meiosis, and cannot be detected in sperm bundles. For expression of the fusion protein, please see janBJBβX.T:EcollacZPA.

(Yanicostas and Lepesant, 1990)
 
Marker for
Reflects expression of
Reporter construct used in assay
Progenitors and Descendants
progenitor(s)
descendant(s)
Comments
Stocks (0)
Stocks containing insertion(s) of this recombinant construct
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (1)
Reported As
Symbol Synonym
P{JBβX}
(FlyBase, 1996-)
Secondary FlyBase IDs
    References (3)