Principles for the regulation of multiple developmental pathways by a versatile transcriptional factor, BLIMP1
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE91041 | GEO | 2017/08/31
SECONDARY ACCESSION(S): PRJNA356724
REPOSITORIES: GEO
Similar Datasets
Project description:Single transcription factors (TFs) regulate multiple developmental pathways, but the underlying mechanisms remain unclear. Here, we quantitatively characterized the genome-wide occupancy profiles of BLIMP1, a key transcriptional regulator for diverse developmental processes, during the development of three germ-layer derivatives (photoreceptor precursors, embryonic intestinal epithelium and plasmablasts) and the germ cell lineage (primordial germ cells). We identified BLIMP1-binding sites shared among multiple developmental processes, and such sites were highly occupied by BLIMP1 with a stringent recognition motif and were located predominantly in promoter proximities. A subset of bindings common to all the lineages exhibited a new, strong recognition sequence, a GGGAAA repeat. Paradoxically, however, the shared/common bindings had only a slight impact on the associated gene expression. In contrast, BLIMP1 occupied more distal sites in a cell type-specific manner; despite lower occupancy and flexible sequence recognitions, such bindings contributed effectively to the repression of the associated genes. Recognition motifs of other key TFs in BLIMP1-binding sites had little impact on the expression-level changes. These findings suggest that the shared/common sites might serve as potential reservoirs of BLIMP1 that functions at the specific sites, providing the foundation for a unified understanding of the genome regulation by BLIMP1, and, possibly, TFs in general.
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Project description:Transcription factors (TFs) regulate biological events depending on cellular contexts, precise mechanisms for which are elusive. BLIMP1 has been shown to play key roles in many developmental processes, canonically as a transcriptional repressor that targets to proximities of promoters. Here, we systematically and quantitatively characterized genomic binding patterns of BLIMP1 across four distinct, developing cell types; photoreceptor precursors, embryonic intestinal epithelium, plasmablasts, and primordial germ cells (PGCs). BLIMP1-binding sites are highly enriched in genomic regions proximal to transcription start sites (TSSs), majority of which are shared among cell types and are highly occupied by BLIMP1, whereas only a small number of associated genes are regulated consistently among cell types. In contrast, BLIMP1 weakly binds to more distal, cell type-specific sites with divergent recognition sequences, which account for gene regulations much more efficiently in proportion to the magnitude of expression level changes, with notably similar impacts per site among cell types. Various TF motifs contained in the cell type-specific binding sites exhibit only moderate impacts on transcription dynamics and BLIMP1-occupancy levels. On the other hand, germ cells uniquely involve the shared binding sites in the specification, and grossly maintain the binding pattern in late PGCs, accounting for vast majority of the repressive targets. Furthermore, we identified new sequence motifs strongly bound to BLIMP1 especially in the late PGCs, GGGAAA repeats, a few of which are located around key regulators of gametogenesis. These findings provide a foundation for understanding the genomic regulation of BLIMP1 across developmental processes.
2017-08-31 | GSE91040 | GEO
Project description:Transcription factors (TFs) regulate biological events depending on cellular contexts, precise mechanisms for which are elusive. BLIMP1 has been shown to play key roles in many developmental processes, canonically as a transcriptional repressor that targets to proximities of promoters. Here, we systematically and quantitatively characterized genomic binding patterns of BLIMP1 across four distinct, developing cell types; photoreceptor precursors, embryonic intestinal epithelium, plasmablasts, and primordial germ cells (PGCs). BLIMP1-binding sites are highly enriched in genomic regions proximal to transcription start sites (TSSs), majority of which are shared among cell types and are highly occupied by BLIMP1, whereas only a small number of associated genes are regulated consistently among cell types. In contrast, BLIMP1 weakly binds to more distal, cell type-specific sites with divergent recognition sequences, which account for gene regulations much more efficiently in proportion to the magnitude of expression level changes, with notably similar impacts per site among cell types. Various TF motifs contained in the cell type-specific binding sites exhibit only moderate impacts on transcription dynamics and BLIMP1-occupancy levels. On the other hand, germ cells uniquely involve the shared binding sites in the specification, and grossly maintain the binding pattern in late PGCs, accounting for vast majority of the repressive targets. Furthermore, we identified new sequence motifs strongly bound to BLIMP1 especially in the late PGCs, GGGAAA repeats, a few of which are located around key regulators of gametogenesis. These findings provide a foundation for understanding the genomic regulation of BLIMP1 across developmental processes.
2017-08-31 | GSE91038 | GEO
Project description:Principles for the regulation of multiple developmental pathways by a versatile transcriptional factor, BLIMP1
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