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| CTCF | |
|---|---|
| Name | CTCF |
| Caption | CCCTC-binding factor |
| Uniprot | P49711 |
| Organism | Homo sapiens |
CTCF CTCF is a zinc-finger DNA-binding protein that functions as an architectural chromatin factor involved in transcriptional regulation, chromatin insulation, and three-dimensional genome organization. Discovered in studies of c-MYC, insulator activity and epigenetics, it has been studied across models such as Homo sapiens, Mus musculus, Drosophila melanogaster, and Saccharomyces cerevisiae-related chromatin systems. Research on CTCF intersects with work on cohesin complex, CTCF-binding sites mapping, and clinical studies addressing cancer and Cornelia de Lange syndrome-related pathways.
CTCF was identified during analyses of regulatory elements at the c-MYC locus and later characterized through comparisons with zinc-finger proteins studied by groups at institutions including the National Institutes of Health and universities like Harvard University and Stanford University. Early functional studies linked it to insulating activity described in classical experiments by researchers working on the β-globin locus and the H19/IGF2 imprinting control region, and subsequent genome-wide efforts by consortia such as the ENCODE Project mapped its widespread binding across human and mouse genomes. CTCF research bridges molecular biology laboratories focused on transcription factors such as Sp1, chromatin biology centers at institutions like the European Molecular Biology Laboratory and clinical genetics groups investigating syndromes tied to chromatin architecture.
CTCF contains 11 central zinc finger motifs of the C2H2 type that enable sequence-specific recognition at diverse genomic sites studied in structural laboratories using techniques pioneered at institutes including the Max Planck Society and the European Synchrotron Radiation Facility. Structural determination using X-ray crystallography and nuclear magnetic resonance revealed modular zinc-finger contacts analogous to structures characterized for proteins such as TFIIIA and EGR1. The protein’s N-terminal and C-terminal regions mediate interactions with chromatin-associated complexes studied by groups at the Cold Spring Harbor Laboratory and the Broad Institute, and its variable affinity across binding motifs was dissected by researchers using high-throughput platforms developed at institutions like the Wellcome Sanger Institute.
Genome-wide mapping by projects such as the ENCODE Project and labs at the University of California, San Diego showed CTCF demarcates regulatory boundaries near promoters, enhancers, and topologically associating domains identified in Hi-C studies initiated by teams at the MIT and the University of Massachusetts Medical School. Mechanistically, CTCF acts with the cohesin complex—including subunits studied in work on SMC1A, SMC3, and RAD21—to stabilize chromatin loops characterized using methods developed at the Genome Research Limited-associated centers. CTCF binding is sensitive to genomic features such as DNA methylation of the H19 imprinting control region, a phenomenon explored in clinical genetics groups at hospitals like Mayo Clinic.
CTCF serves as an anchor for chromatin loops and insulator elements first functionally defined in experiments on the β-globin locus and later generalized in studies from the Friedman Laboratory and labs at the Institute of Cancer Research. Its boundaries correspond to topologically associating domains discovered by consortia including the 4D Nucleome project and are critical for proper enhancer–promoter communication analyzed in developmental studies at institutions like the Max Planck Institute for Molecular Genetics. Disruption of CTCF sites has phenotypic consequences observed in model organism facilities at the European Molecular Biology Laboratory and clinical case studies described in literature from university hospitals such as Johns Hopkins Hospital.
CTCF activity is modulated by post-translational modifications including phosphorylation, poly-ADP-ribosylation, and SUMOylation characterized in biochemical work from laboratories at the European Molecular Biology Laboratory and the Salk Institute. These modifications influence interactions with factors such as PARP1, whose enzymology was advanced by researchers at the University of Cambridge, and affect recruitment of chromatin remodelers studied at the Rockefeller University. Regulation also involves competition or cooperation with transcriptional regulators like YY1 and nuclear complexes described in proteomics screens by groups at the Broad Institute and the Max Planck Institute for Biophysical Chemistry.
Functional perturbation of CTCF binding has been linked to developmental defects and diseases including cancers profiled by the Cancer Genome Atlas and imprinting disorders such as Beckwith–Wiedemann syndrome and Silver–Russell syndrome studied in clinical genetics units at hospitals like Great Ormond Street Hospital and research centers such as the Institut Curie. Mouse knockout and conditional alleles generated by labs at institutions including the Jackson Laboratory revealed roles in lineage specification, X-chromosome inactivation processes analyzed by groups at the Whitehead Institute, and neural development examined at neuroscience centers like the Max Planck Institute for Brain Research. Somatic mutations affecting boundary elements have been reported in manuscripts from collaborative networks including the International Cancer Genome Consortium.
Key methods for studying CTCF include chromatin immunoprecipitation followed by sequencing (ChIP-seq) developed by teams at the Genome Research Limited and applied in studies from the ENCODE Project, chromosome conformation capture techniques (3C, 4C, Hi-C) pioneered by groups at MIT and the Institut Pasteur, single-molecule footprinting used in labs at the University of Oxford, and CRISPR-based perturbation strategies implemented in work from the Broad Institute and Stanford University. Proteomics approaches linking CTCF to interaction partners utilize mass spectrometry platforms advanced at the Max Planck Institute for Biochemistry and the Proteomics Facility, University of Dundee.
Category:Chromatin proteins