ArticleCell reports2025
Bicoid-nucleosome competition sets a concentration threshold for transcription constrained by genome replication.
Article in Cell reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
4 citing papers in PubMed.
- Asymmetric chromatin accessibility underlies anterior-posterior axis specification in moth fly embryos.PLoS biology · 2026Article
- Maternal patterning in early Drosophila embryos: how much information can single maternal gradients supply?Development (Cambridge, England) · 2026Article
- Breaking anterior-posterior symmetry in the moth flybioRxiv : the preprint server for biology · 2025Article
- Lower-order methylation states underlie the maintenance and re-establishment of Polycomb modifications inbioRxiv : the preprint server for biology · 2025Article
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Abstract
Transcription factors (TFs) regulate gene expression despite constraints from chromatin structure and the cell cycle. Here, we examine the concentration-dependent regulation of hunchback by the Bicoid morphogen through a combination of quantitative imaging, mathematical modeling, and epigenomics in Drosophila embryos. By live imaging of MS2 reporters, we find that, following mitosis, the timing of transcriptional activation driven by the hunchback P2 (hbP2) enhancer directly reflects Bicoid concentration. We build a stochastic model that can explain in vivo onset time distributions by accounting for both the competition between Bicoid and nucleosomes at hbP2 and a negative influence of DNA replication on transcriptional elongation. Experimental modulation of nucleosome stability alters onset time distributions and the posterior boundary of hunchback expression. We conclude that TF-nucleosome competition is the molecular mechanism whereby the Bicoid morphogen gradient specifies the posterior boundary of hunchback expression.
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