FB2026_03 , released September 17, 2026

CV Term Report

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General Information

Term

binary expression system - repressor

ID (Ontology)

FBcv:0005061 (FlyBase CV)

Definition

Repressor that can be used to regulate expression in a binary expression system. This system requires a transactivator ('driver') that binds to a specific DNA sequence ('regulatory region' or 'effector'). A driver encoded by one transgenic locus or modified endogenous locus is used to drive expression of a downstream 'responder' or 'reporter' encoded by another transgenic locus or modified endogenous locus, by fusing the regulatory region sequence to which the driver binds upstream of the responder sequence. The temporal and spatial expression pattern of the responder thus depends on the regulatory elements used to drive expression of the driver. In addition, a specific repressor protein may be available which prevents the transactivator from driving expression, allowing further refinement of the expression pattern of the responder.[ FlyBase:FBrf0216478 ]

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Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records

Full annotation statements	Relevant FlyBase reports
Full annotation statements	Genes	Experimental Tools
binary expression system - repressor (all annotations which use CV term, excluding "NOT" statements)
encodes tool \| binary expression system - repressor	--
tagged with \| binary expression system - repressor	--

Spanning Tree (Parents/Children)

  experimental tool descriptor
   |__binary expression system component
       |__binary expression system - repressor  7 rec.
           |__binary expression system - conditional repressor 2 rec.
               |__binary expression system - temperature conditional repressor 2 rec.

Spanning Tree View Settings
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Relationships
Is a	binary expression system component
Part of
Synonyms & Secondary IDs
Synonyms

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External Crossreferences & Linkouts