FB2026_02 , released June 18, 2026
Recombinant Construct: P{GMR20B01-GAL4}
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General Information
Symbol
P{GMR20B01-GAL4}
FlyBase ID
FBtp0058207
Feature type
transgenic_transposable_element
Component Allele(s)
Scer\GAL4GMR20B01
Also Known As
R20B01-GAL4, Basin-1-GAL4, 20B01-GAL4
Size
Expression Data
GAL4 reporter/driver
Associated insertion(s)
2 available
Molecular map
Description and Uses
Construct components
Component
Use(s)
Marker(s)
w+mC
Component allele Scer\GAL4GMR20B01
Transgenic product class
Component
Use(s)
Regulatory region(s)
GMR20B01
Encoded product / tool
GAL4
Description

A 1999 base pair fragment from the flanking non-coding or intronic region of crb is fused upstream of a Drosophila core synthetic promoter (DSCP) that is followed by sequence encoding a GAL4 driver.

(Pfeiffer et al., 2011.2.9)
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
distribution deduced from reporter (Gal4 UAS)
Stage
Tissue/Position (including subcellular localization)
Reference
first instar larval stage
interneuron | subset of larval central nervous system
(Li et al., 2014)
third instar larval stage
larval Basin-1 neuron
(Ohyama et al., 2015)
wandering third instar larval stage
interneuron | subset of larval abdominal neuromere
(Li et al., 2014)
Additional Information
Statement
Reference

ScerGAL4GMR20B01 drives expression in interneurons in the embryonic/larval central nervous system. Labeling is seen in a subset of neurons in the first instar larval brain and very few neurons of the ventral nerve cord. The number of labelled neurons in the abdominal neuromeres is increased in wandering third instar larva but expression in the brain is no longer observed at this stage.

(Li et al., 2014)
 
Marker for
larval Basin-1 neuron
(Ohyama et al., 2015)
Reflects expression of
Reporter construct used in assay
Progenitors and Descendants
progenitor(s)
pBPGUw
(Pfeiffer et al., 2011.2.9)
descendant(s)
Comments
Stocks (1)
Stocks containing insertion(s) of this recombinant construct
Bloomington
48877
w1118; P{GMR20B01-GAL4}attP2
External Crossreferences and Linkouts ( 0 )
Synonyms and Secondary IDs (7)
Reported As
Symbol Synonym
20B01-GAL4
(Wang et al., 2022)
20B01-Gal4
(Lehman et al., 2025)
Basin-1-GAL4
(Wang et al., 2022, Wilhelm et al., 2022)
P{GMR20B01-GAL4}
(FlyBase, 1996-)
R20B01
(Li et al., 2014, FlyBase, 1996-)
R20B01-GAL4
(Patel et al., 2025, Wilhelm et al., 2022, Jovanic et al., 2016, Ohyama et al., 2015)
R20B01-Gal4
(Lopez-Bellido et al., 2019)
Secondary FlyBase IDs
    References (11)