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Testis-specific TAF homologs collaborate to control a tissue-specific transcription program
Mark Hiller1, Xin Chen, M Jodeane Pringle
1Department of Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305-5329, USA.
Development (Cambridge, England)
|October 1, 2004
Summary
Five testis-specific TAF proteins in Drosophila collaborate to form an alternative transcription initiation complex. This complex is crucial for regulating gene expression during male germ cell differentiation.
Area of Science:
- Developmental Biology
- Molecular Biology
- Genetics
Background:
- Alternate forms of transcription machinery regulate cell-type-specific gene expression during differentiation.
- The cannonball (can) gene product, a TBP-associated factor (TAF5) homolog, is essential for spermatid differentiation in Drosophila.
Purpose of the Study:
- To investigate the role of additional tissue-specific TAFs in Drosophila spermatogenesis.
- To determine if these testis-specific TAFs form a distinct transcription initiation complex.
Main Methods:
- Identified and characterized four new testis-specific TAF homologs (nht, mia, sa, rye) in Drosophila.
- Analyzed the effects of mutations in these genes on gene transcription and meiotic progression.
- Investigated protein-protein interactions using bacterial co-expression assays.
Main Results:
- Mutations in nht, mia, and sa phenocopy can mutations, blocking meiosis and spermatid differentiation.
- The testis-specific TAFs (nht, mia, sa, rye) contain histone fold dimerization motifs.
- Tissue-specific interactions were observed between testis TAFs, distinct from their general homologs.
Conclusions:
- A novel, testis-specific TAF-containing complex likely regulates gene expression programs essential for male germ cell terminal differentiation.
- This alternative transcription machinery plays a critical role in spermatogenesis by controlling cell-type-specific gene activation.