FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term myotube ID (Ontology) FBbt:00005812 (Fly Anatomy)
Definition Multinucleated muscle cell formed by several fusion events between fusion competent myoblasts and one founder cell. The size of a myotube is correlated to the number of fusion competent cells that fuse with a founder cell or developing myotube.[ FlyBase:FBrf0051585 FlyBase:FBrf0205186 FlyBase:FBrf0217289 ]
Also Known As "muscle fiber" ; "myofiber" ; "myofibril"
Comment In contrast to vertebrates, in Drosophila embryos and larva, each muscle is a single myotube (Maqbool and Jagla, 2007).
Links to External Ontologies
Annotations
Records annotated with this term OR any of its CHILD TERMS
Records annotated with this exact term (annotations to child terms are NOT included)
Data Class Field Records
Alleles (FBal)  PHENOTYPE_MANIFEST_IN      66
Insertions (FBti)  PHENOTYPE_MANIFEST_IN       5
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      51
show Full annotation statements including this term (annotations to child terms are NOT included), and relevant FlyBase records
 Full annotation statements 
Relevant FlyBase reports
 Alleles Genes Insertions Constructs
 myotube (all annotations which use CV term, excluding "NOT" statements)      67      6      5     57
     myotube | adult stage      16       --       --      12
     myotube | adult stage | progressive      11       --       --       8
     myotube | decreased number | pupal stage       2       --       --       2
     myotube | embryonic stage       3       --       --       --
     myotube | larval stage       2       --       --       2
     myotube | P-stage       7       --       2      5
     myotube | pupal stage      14       --       --      13
     myotube | pupal stage | somatic clone - tissue specific       1       --       --       1
     myotube | second instar larval stage       3       --       --       3
     myotube | third instar larval stage       8       --       2      5
     myotube | wandering third instar larval stage       2       --       1       --
Spanning Tree (Parents/Children)
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  somatic cell
   |__muscle cell
       |__myotube  135 rec.
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CL:0002372