Ctcf
Mostrando 1-12 de 43 artigos, teses e dissertações.
-
1. Caracterização funcional da interação entre as proteínas CTSP-1 e CTCF / Functional characterization of the interaction between the proteins CTSP-1 and CTCF.
Cancer-testis (CT) antigens are immunogenic proteins expressed in gametogenic tissues and in different histological types of tumors, being considered promising candidates for cancer immunotherapy. However, little is known about their role in tumorigenesis. In 2006, we identified CTSP-1 as a novel CT antigen, frequently expressed in different types of tumors.
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/12/2011
-
2. Expression of the CTCF gene in bovine oocytes and preimplantation embryos
The CCCTC - binding factor (CTCF) is a protein involved in repression, activation, hormone-inducible gene silencing, functional reading of imprinted genes and X-chromosome inactivation. We analyzed CTCF gene expression in bovine peripheral blood, oocytes and in different cellular stages (2-4 cells, 8-16 cells, 16-32 cells, morulae, and blastocysts) of in vit
Genetics and Molecular Biology. Publicado em: 2007
-
3. Molecular weight abnormalities of the CTCF transcription factor: CTCF migrates aberrantly in SDS-PAGE and the size of the expressed protein is affected by the UTRs and sequences within the coding region of the CTCF gene.
CTCF belongs to the Zn finger transcription factors family and binds to the promoter region of c-myc. CTCF is highly conserved between species, ubiquitous and localised in nuclei. The endogenous CTCF migrates as a 130 kDa (CTCF-130) protein on SDS-PAGE, however, the open reading frame (ORF) of the CTCF cDNA encodes only a 82 kDa protein (CTCF-82). In the pre
-
4. An exceptionally conserved transcriptional repressor, CTCF, employs different combinations of zinc fingers to bind diverged promoter sequences of avian and mammalian c-myc oncogenes.
We have isolated and analyzed human CTCF cDNA clones and show here that the ubiquitously expressed 11-zinc-finger factor CTCF is an exceptionally highly conserved protein displaying 93% identity between avian and human amino acid sequences. It binds specifically to regulatory sequences in the promoter-proximal regions of chicken, mouse, and human c-myc oncog
-
5. CTCF, a conserved nuclear factor required for optimal transcriptional activity of the chicken c-myc gene, is an 11-Zn-finger protein differentially expressed in multiple forms.
A novel sequence-specific DNA-binding protein, CTCF, which interacts with the chicken c-myc gene promoter, has been identified and partially characterized (V. V. Lobanenkov, R. H. Nicolas, V. V. Adler, H. Paterson, E. M. Klenova, A. V. Polotskaja, and G. H. Goodwin, Oncogene 5:1743-1753, 1990). In order to test directly whether binding of CTCF to one specifi
-
6. Thyroid hormone-regulated enhancer blocking: cooperation of CTCF and thyroid hormone receptor
The highly conserved, ubiquitously expressed, zinc finger protein CTCF is involved in enhancer blocking, a mechanism crucial for shielding genes from illegitimate enhancer effects. Interestingly, CTCF-binding sites are often flanked by thyroid hormone response elements (TREs), as at the chicken lysozyme upstream silencer. Here we identify a similar composite
Oxford University Press.
-
7. Functional Phosphorylation Sites in the C-Terminal Region of the Multivalent Multifunctional Transcriptional Factor CTCF
CTCF is a widely expressed and highly conserved multi-Zn-finger (ZF) nuclear factor. Binding to various CTCF target sites (CTSs) is mediated by combinatorial contributions of different ZFs. Different CTSs mediate distinct CTCF functions in transcriptional regulation, including promoter repression or activation and hormone-responsive gene silencing. In additi
American Society for Microbiology.
-
8. Negative protein 1, which is required for function of the chicken lysozyme gene silencer in conjunction with hormone receptors, is identical to the multivalent zinc finger repressor CTCF.
The transcriptional repressor negative protein 1 (NeP1) binds specifically to the F1 element of the chicken lysozyme gene silencer and mediates synergistic repression by v-ERBA, thyroid hormone receptor, or retinoic acid receptor. Another protein, CCCTC-binding factor (CTCF), specifically binds to 50-bp-long sequences that contain repetitive CCCTC elements i
-
9. Transcriptional repression by the insulator protein CTCF involves histone deacetylases
The highly conserved zinc-finger protein, CTCF, is a candidate tumor suppressor protein that binds to highly divergent DNA sequences. CTCF has been connected to multiple functions in chromatin organization and gene regulation including chromatin insulator activity and transcriptional enhancement and silencing. Here we show that CTCF harbors several autonomou
Oxford University Press.
-
10. Mutation of a Single CTCF Target Site within the H19 Imprinting Control Region Leads to Loss of Igf2 Imprinting and Complex Patterns of De Novo Methylation upon Maternal Inheritance
The differentially methylated imprinting control region (ICR) region upstream of the H19 gene regulates allelic Igf2 expression by means of a methylation-sensitive chromatin insulator function. We have previously shown that maternal inheritance of mutated (three of the four) target sites for the 11-zinc finger protein CTCF leads to loss of Igf2 imprinting. H
American Society for Microbiology.
-
11. CTCF functions as a critical regulator of cell-cycle arrest and death after ligation of the B cell receptor on immature B cells
The WEHI 231 B cell lymphoma is used as a model of self-tolerance by clonal deletion because B cell receptor (BCR) ligation results in apoptosis. Two critical events precede cell death: an early rise and fall in expression of MYC and cell-cycle arrest associated with enhanced expression of p21, p27, and p53. CTCF is a transcription factor identified as a rep
The National Academy of Sciences.
-
12. The 5′-HS4 chicken β-globin insulator is a CTCF-dependent nuclear matrix-associated element
The protein CTCF plays an essential role in the action of a widely distributed class of vertebrate enhancer-blocking insulators, of which the first example was found in a DNA sequence element, HS4, at the 5′ end of the chicken β-globin locus. HS4 contains a binding site for CTCF that is necessary and sufficient for insulator action. Purification of CTCF h
National Academy of Sciences.