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Developmental Biology
Article
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Developmental Biology
Article . 2013
License: Elsevier Non-Commercial
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Developmental Biology
Article . 2013 . Peer-reviewed
License: Elsevier Non-Commercial
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Three levels of regulation lead to protamine and Mst77F expression in Drosophila

Authors: Barckmann, Bridlin; Chen, Xin; Kaiser, Sophie; Jayaramaiah-Raja, Sunil; Rathke, Christina; Dottermusch-Heidel, Christine; Fuller, Margaret T.; +1 Authors

Three levels of regulation lead to protamine and Mst77F expression in Drosophila

Abstract

Differentiation from a haploid round spermatid to a highly streamlined, motile sperm requires temporal and spatial regulation of the expression of numerous proteins. One form of regulation is the storage of translationally repressed mRNAs. In Drosophila spermatocytes, the transcription of many of these translationally delayed mRNAs during spermiogenesis is in turn directly or indirectly regulated by testis-specific homologs of TATA-box-binding-protein-associated factors (tTAFs). Here we present evidence that expression of Mst77F, which is a specialized linker histone-like component of sperm chromatin, and of protamine B (ProtB), which contributes to formation of condensed sperm chromatin, is regulated at three levels. Transcription of Mst77F is guided by a short, promoter-proximal region, while expression of the Mst77F protein is regulated at two levels, early by translational repression via sequences mainly in the 5' part of the ORF and later by either protein stabilization or translational activation, dependent on sequences in the ORF. The protB gene is a direct target of tTAFs, with very short upstream regulatory regions of protB (-105 to +94 bp) sufficient for both cell-type-specific transcription and repression of translation in spermatocytes. In addition, efficient accumulation of the ProtB protein in late elongating spermatids depends on sequences in the ORF. We present evidence that spermatocytes provide the transacting mechanisms for translational repression of these mRNAs, while spermatids contain the machinery to activate or stabilize protamine accumulation for sperm chromatin components. Thus, the proper spatiotemporal expression pattern of major sperm chromatin components depends on cell-type-specific mechanisms of transcriptional and translational control.

Keywords

Male, tTAF target genes, Transcription, Genetic, Mst77F, Protamine, Histones, Open Reading Frames, Transcriptional regulation, Spermatocytes, Animals, Drosophila Proteins, Protamines, RNA, Messenger, Molecular Biology, TATA-Binding Protein Associated Factors, Base Sequence, Cell Biology, Translational repression, Translational activation, Drosophila melanogaster, Gene Expression Regulation, Protein Biosynthesis, 5' Untranslated Regions, Developmental Biology

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
31
Top 10%
Top 10%
Top 10%
hybrid