FB2025_05 , released December 11, 2025
FB2025_05 , released December 11, 2025
CV Term Report
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General Information
Term spermatogonium ID (Ontology) FBbt:00004935 (Fly Anatomy)
Definition Male germline cell found in the spermatogonial cyst. It specifically expresses bag of marbles (bam), which is required for its differentiation (Witt et al., 2019).[ FlyBase:FBrf0064778 FlyBase:FBrf0243241 ]
Comment
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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     115
Insertions (FBti)  EXPRESSION_STAGE_TISSUE_POSITION       7
Insertions (FBti)  PHENOTYPE_MANIFEST_IN      26
Constructs (FBtp)  PHENOTYPE_MANIFEST_IN      56
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
 spermatogonium (all annotations which use CV term, excluding "NOT" statements)     115    106      4     33     68
     spermatogonium | absent       2       --       --       --       --
     spermatogonium | adult stage       3       --       --       2       --
     spermatogonium | calorie restriction conditional       4       --       --       --       1
     spermatogonium | cell non-autonomous | calorie restriction conditional       2       --       --       --       1
     spermatogonium | germline clone | increased number       4       --       --       --       --
     spermatogonium | heat sensitive       6       --       --       3      1
     spermatogonium | increased number      17       --       --       --      11
     spermatogonium | somatic clone       1       --       --       --       --
     spermatogonium | temperature conditional       4       --       --       --       2
     spermatogonium | third instar larval stage      11       --       --       2      3
Spanning Tree (Parents/Children)
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germline cell____________________
male-specific anatomical entity__|
                                 male germline cell
                                  |__spermatogonium  367 rec.
                                      |__primary gonial cell 61 rec.
                                      |__secondary spermatogonium 10 rec.
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Is a male germline cell
Develops from male germline stem cell
Part of spermatogonial cyst
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Synonyms
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CL:0000020