FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term fusome ID (Ontology) FBbt:00004862 (Fly Anatomy)
Definition Cytoplasmic membrane-rich zones found in developing germline stem cells and their progeny. A small spherical fusome (spectrosome) grows during germline stem cell formation into a large branched structure (polyfusome) that extends through the ring canals into every cyst cell in germarium region 2a. Once the germline cyst has stopped dividing, the fusome begins to break down, usually disappearing soon after the progeny of the germline stem cell leaves the germarium.[ FlyBase:FBrf0103408 ]
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Data Class Field Records
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION      22
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 Genes Insertions
 fusome (all annotations which use CV term, excluding "NOT" statements)      10     22
Spanning Tree (Parents/Children)
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  anatomical structure
   |__cell component
       |__fusome  167 rec.
           |__female fusome 60 rec.
           |   |__nurse cell fusome 22 rec.
           |__male fusome 61 rec.
           |   |__spermatocyte fusome 28 rec.
           |__polyfusome 2 rec.
           |__spectrosome 36 rec.
           |   |__nurse cell spectrosome 18 rec.
           |   |__spermatocyte cell spectrosome 8 rec.
           |__stem cell fusome 14 rec.
               |__elongated stem cell fusome
               |__round stem cell fusome 7 rec.
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Is a cell component
Part of gonad
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