ArticlePLoS genetics2016
Functional Dissection of the Blocking and Bypass Activities of the Fab-8 Boundary in the Drosophila Bithorax Complex.
Article in PLoS genetics, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers.
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Who cites it
34 citing papers in PubMed.
- Shared binding sites for the chromosomal architectural protein Su(Hw) mediate physical interactions betweenbioRxiv : the preprint server for biology · 2026Article
- Initiators counteract Polycomb repression and stimulate long-range contacts between enhancers and theOpen biology · 2025Article
- Interchromosomal contacts between regulatory regions trigger stable transgenerational epigenetic inheritance in Drosophila.Molecular cell · 2025Article
- New Drosophila promoter-associated architectural protein Mzfp1 interacts with CP190 and is required for housekeeping gene expression and insulator activity.Nucleic acids research · 2024Article
- The N-terminal dimerization domains of human and Drosophila CTCF have similar functionality.Epigenetics & chromatin · 2024Article
- lncRNA read-through regulates the BX-C insulatoreLife · 2023Article
- Boundary bypass activity in theOpen biology · 2023Article
- Boundary Bypass Activity in thebioRxiv : the preprint server for biology · 2023Article
- Transcriptional read through interrupts boundary function in Drosophila.bioRxiv : the preprint server for biology · 2023Article
- Mechanisms of Interaction between Enhancers and Promoters in ThreeInternational journal of molecular sciences · 2023Review
- Fragments of the Fab-3 and Fab-4 Boundaries of the Drosophila melanogaster Bithorax Complex That Include CTCF Sites Are not Effective Insulators.Doklady. Biochemistry and biophysics · 2022Article
- Three classes of epigenomic regulators converge to hyperactivate the essential maternal gene deadhead within a heterochromatin mini-domain.PLoS genetics · 2022Article
- Redundant enhancers in the iab-5 domain cooperatively activate Abd-B in the A5 and A6 abdominal segments of Drosophila.Development (Cambridge, England) · 2021Article
- Boundaries potentiate polycomb response element-mediated silencing.BMC biology · 2021Article
- Mechanism and functional role of the interaction between CP190 and the architectural protein Pita in Drosophila melanogaster.Epigenetics & chromatin · 2021Article
- Mapping of functional elements of the Fab-6 boundary involved in the regulation of the Abd-B hox gene in Drosophila melanogaster.Scientific reports · 2021Article
- Homeotic Genes: Clustering, Modularity, and Diversity.Frontiers in cell and developmental biology · 2021Review
- Insulator-based loops mediate the spreading of H3K27me3 over distant micro-domains repressing euchromatin genes.Genome biology · 2020Article
- The insulator functions of theScience advances · 2020Article
- Article
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9 authors.
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Abstract
Functionally autonomous regulatory domains direct the parasegment-specific expression of the Drosophila Bithorax complex (BX-C) homeotic genes. Autonomy is conferred by boundary/insulator elements that separate each regulatory domain from its neighbors. For six of the nine parasegment (PS) regulatory domains in the complex, at least one boundary is located between the domain and its target homeotic gene. Consequently, BX-C boundaries must not only block adventitious interactions between neighboring regulatory domains, but also be permissive (bypass) for regulatory interactions between the domains and their gene targets. To elucidate how the BX-C boundaries combine these two contradictory activities, we have used a boundary replacement strategy. We show that a 337 bp fragment spanning the Fab-8 boundary nuclease hypersensitive site and lacking all but 83 bp of the 625 bp Fab-8 PTS (promoter targeting sequence) fully rescues a Fab-7 deletion. It blocks crosstalk between the iab-6 and iab-7 regulatory domains, and has bypass activity that enables the two downstream domains, iab-5 and iab-6, to regulate Abdominal-B (Abd-B) transcription in spite of two intervening boundary elements. Fab-8 has two dCTCF sites and we show that they are necessary both for blocking and bypass activity. However, CTCF sites on their own are not sufficient for bypass. While multimerized dCTCF (or Su(Hw)) sites have blocking activity, they fail to support bypass. Moreover, this bypass defect is not rescued by the full length PTS. Finally, we show that orientation is critical for the proper functioning the Fab-8 replacement. Though the inverted Fab-8 boundary still blocks crosstalk, it disrupts the topology of the Abd-B regulatory domains and does not support bypass. Importantly, altering the orientation of the Fab-8 dCTCF sites is not sufficient to disrupt bypass, indicating that orientation dependence is conferred by other factors.
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