Coordinated Control of dCTCF and gypsy Chromatin Insulators in Drosophila
Copyright policy )Coordinated Control of dCTCF and gypsy Chromatin Insulators in Drosophila
CTCF plays a central role in vertebrate insulators and forms part of the Fab-8 insulator in Drosophila. dCTCF is present at hundreds of sites in the Drosophila genome, where it is located at the boundaries between bands and interbands in polytene chromosomes. dCTCF colocalizes with CP190, which is required for proper binding of dCTCF to chromatin, but not with the other gypsy insulator proteins Su(Hw) or Mod(mdg4)2.2. Mutations in the CP190 gene affect Fab-8 insulator activity, suggesting that CP190 is an essential component of both gypsy and dCTCF insulators. dCTCF is present at specific nuclear locations, forming large insulator bodies that overlap with those formed by Su(Hw), Mod(mdg4)2.2, and CP190. The results suggest that Su(Hw) and dCTCF may be the DNA-binding components of two different subsets of insulators that share CP190 and cooperate in the formation of insulator bodies to regulate the organization of the chromatin fiber in the nucleus.
- Johns Hopkins University United States
Cell Nucleus, CCCTC-Binding Factor, Chromatin Immunoprecipitation, Binding Sites, Nuclear Proteins, Cell Biology, Chromatin, Animals, Genetically Modified, DNA-Binding Proteins, Repressor Proteins, Drosophila melanogaster, Two-Hybrid System Techniques, Mutation, Animals, Drosophila Proteins, Insulator Elements, Molecular Biology, Microtubule-Associated Proteins, In Situ Hybridization, Transcription Factors
Cell Nucleus, CCCTC-Binding Factor, Chromatin Immunoprecipitation, Binding Sites, Nuclear Proteins, Cell Biology, Chromatin, Animals, Genetically Modified, DNA-Binding Proteins, Repressor Proteins, Drosophila melanogaster, Two-Hybrid System Techniques, Mutation, Animals, Drosophila Proteins, Insulator Elements, Molecular Biology, Microtubule-Associated Proteins, In Situ Hybridization, Transcription Factors
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