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The p53 pathway and metabolism: Implications in normal development, aging and cancer development. ANNALES D'ENDOCRINOLOGIE 2023. [DOI: 10.1016/j.ando.2022.12.370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
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2
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Assemblage du protéasome et différenciation épidermique : intérêt dans le psoriasis. Ann Dermatol Venereol 2014. [DOI: 10.1016/j.annder.2014.04.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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La protéine multifonctionnelle E4F1 : un lien entre métabolisme énergétique et homéostasie cutanée. Ann Dermatol Venereol 2013. [DOI: 10.1016/j.annder.2013.09.638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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4
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Abstract
The E1A-targeted transcription factor E4F1 is a key player in the control of mammalian embryonic and somatic cell proliferation and survival. Mouse embryos lacking E4F die at an early developmental stage, whereas enforced expression of E4F1 in various cell lines inhibits cell cycle progression. E4F1-antiproliferative effects have been shown to depend on its capacity to repress transcription and to interact with pRb and p53. Here we show that full-length E4F1 protein (p120(E4F1)) but not its E1A-activated and truncated form (p50(E4F1)), interacts directly in vitro and in vivo with the LIM-only protein FHL2, the product of the p53-responsive gene FHL2/DRAL (downregulated in rhabdomyosarcoma Lim protein). This E4F1-FHL2 association occurs in the nuclear compartment and inhibits the capacity of E4F1 to block cell proliferation. Consistent with this effect, ectopic expression of FHL2 inhibits E4F1 repressive effects on transcription and correlates with a reduction of nuclear E4F1-p53 complexes. Overall, these results suggest that FHL2/DRAL is an inhibitor of E4F1 activity. Finally, we show that endogenous E4F1-FHL2 complexes form in U2OS cells upon UV-light-induced nuclear accumulation of FHL2.
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The periodic down regulation of Cyclin E gene expression from exit of mitosis to end of G(1) is controlled by a deacetylase- and E2F-associated bipartite repressor element. Oncogene 2001; 20:4115-27. [PMID: 11464278 DOI: 10.1038/sj.onc.1204514] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2001] [Revised: 04/06/2001] [Accepted: 04/09/2001] [Indexed: 11/09/2022]
Abstract
The expression of cyclin E and that of a few other bona fide cell cycle regulatory genes periodically oscillates every cycle in proliferating cells. Although numerous experiments have documented the role of E2F sites and E2F activities in the control of these genes as cells exit from G(0) to move through the initial G(1)/S phase transition, almost nothing is known on the role of E2Fs during the subsequent cell cycles. Here we show that a variant E2F-site that is part of the Cyclin E Repressor Module (CERM) (Le Cam et al., 1999b) accounts for the periodic down regulation of the cyclin E promoter observed between the exit from mitosis until the mid/late G(1) phase in exponentially cycling cells. This cell cycle-dependent repression correlates with the periodic binding of an atypical G(1)-specific high molecular weight p107-E2F complex (Cyclin E Repressor Complex: CERC2) that differs in both size and DNA binding behaviors from known p107-E2F complexes. Notably, affinity purified CERC2 displays a TSA-sensitive histone deacetylase activity and, consistent with this, derepression of the cyclin E promoter by trichostatin A depends on the CERM element. Altogether, this shows that the cell cycle-dependent control of cyclin E promoter in cycling cells is embroiled in acetylation pathways via the CERM-like E2F element.
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pRB binds to and modulates the transrepressing activity of the E1A-regulated transcription factor p120E4F. Proc Natl Acad Sci U S A 2000; 97:7738-43. [PMID: 10869426 PMCID: PMC16614 DOI: 10.1073/pnas.130198397] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The retinoblastoma protein pRB is involved in the transcriptional control of genes essential for cell cycle progression and differentiation. pRB interacts with different transcription factors and thereby modulates their activity by sequestration, corepression, or activation. We report that pRB, but not p107 and p130, binds to and facilitates repression by p120(E4F), a ubiquitously expressed GLI-Kruppel-related protein identified as a cellular target of E1A. The interaction involves two distinct regions of p120(E4F) and the C-terminal part of pRB. In vivo pRB-p120(E4F) complexes can only be detected in growth-arrested cells, and accordingly contain the hypophosphorylated form of pRB. Repression of an E4F-responsive promoter is strongly increased by combined expression of p120(E4F) and pRB, which correlates with pRB-dependent enhancement of p120(E4F) binding activity. Elevated levels of p120(E4F) have been shown to block growth of mouse fibroblasts in G(1). We find this requires pRB, because RB(-/-) fibroblasts are significantly less sensitive to excess p120(E4F).
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Human E2F5 gene is oncogenic in primary rodent cells and is amplified in human breast tumors. Genes Chromosomes Cancer 2000; 28:126-30. [PMID: 10738311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
E2F transcription factors (E2F1 to 6) are central players in the control of animal cell proliferation as regulators of genes involved in cell cycle progression and in transformation. In this report, we have investigated the potential involvement of the E2F5 gene in tumorigenesis. We show that E2F5 can promote the formation of morphologically transformed foci in primary baby rat kidney cells (BRK) when it is overexpressed in the presence of its heterodimeric partner DP1 and activated RAS. This suggests that E2F5 behaves like a MYC-type cooperating oncogene in functional assays, prompting us to monitor potential amplifications of the E2F5 gene in primary human tumors. We mapped the human E2F5 gene to 8q21.1-21.3 equidistant from the MOS (8q12) and MYC (8q24) oncogenes. Since the long arm of chromosome 8 is frequently the site of increased gene copy number (ICN) in breast cancer, we screened 442 breast tumor DNAs for gains of E2F5, MOS, and MYC genes. The three genes showed ICN, albeit at variable incidence and levels of amplification, with the ICN of E2F5 occurring concomitantly with those of MOS and/or MYC in almost half of the cases. Moreover, a marked increase of the 2. 5-kb E2F5 transcript was also detected in some tumors and tumor cell lines. In conclusion, the evidence that sustained unregulated expression of E2F5 can cooperate with other oncogenes to promote cell transformation in functional assays, together with the detection of chromosomal amplifications and overexpressions of the E2F5 gene in breast tumors, provides the first indications that E2F5 deregulation may have a role in human tumor development.
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Abstract
The bipartite repressor elements, termed cell cycle-dependent element (CDE)/cell cycle regulatory element (CCRE)-cell cycle homology region (CHR) control the growth-dependent transcription of the cyclin A, cdc25C, cdc2 genes. Here, we have identified a functional element displaying the signature of the CDE-CHR in the promoter of the mouse RB2 (p130) gene, encoding the retinoblastoma protein family (pRB)-related protein p130. This element locates close to the major transcription start site where it makes major groove contacts with proteins that can be detected in a cellular context using in vivo genomic footprinting techniques. Inactivation of either the CDE or CHR sequence strongly up-regulates the p130 promoter activity in exponentially growing cells, a situation where endogenous p130 gene expression is almost undetectable. Electrophoretic mobility shift assays suggest that two different protein complexes bind independently to the p130 CDE and CHR elements, and that the protein(s) bound to the CDE might be related to those bound on cyclin A and cdc2 promoters.
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Erythroid-specific inhibition of the tal-1 intragenic promoter is due to binding of a repressor to a novel silencer. J Biol Chem 2000; 275:949-58. [PMID: 10625632 DOI: 10.1074/jbc.275.2.949] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The basic helix-loop-helix tal-1 gene plays a key role in hematopoiesis, and its expression is tightly controlled through alternative promoters and complex interactions of cis-acting regulatory elements. tal-1 is not expressed in normal T cells, but its transcription is constitutive in a large proportion of human T cell leukemias. We have previously described a downstream initiation of tal-1 transcription specifically associated with a subset of T cell leukemias that leads to the production of NH(2)-truncated TAL-1 proteins. In this study, we characterize the human promoter (promoter IV), embedded within a GC-rich region in exon IV, responsible for this transcriptional activity. The restriction of promoter IV usage is assured by a novel silencer element in the 3'-untranslated region of the human gene that represses its activity in erythroid but not in T cells. The silencer activity is mediated through binding of a tissue-specific nuclear factor to a novel protein recognition motif (designated tal-RE) in the silencer. Mutation of a single residue within the tal-RE abolishes both specific protein binding and silencing activity. Altogether, our results demonstrate that the tal-1 promoter IV is actively repressed in cells of the erythro-megakaryocytic lineage and that this repression is released in leukemic T cells, resulting in the expression of the tal-1 truncated transcript.
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Inhibition of mammalian cell proliferation by genetically selected peptide aptamers that functionally antagonize E2F activity. Oncogene 1999; 18:4357-63. [PMID: 10439043 DOI: 10.1038/sj.onc.1202825] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The p16-cyclin D-pRB-E2F pathway is frequently deregulated in human tumors. This critical regulatory pathway controls the G1/S transition of the mammalian cell cycle by positive and negative regulation of E2F-responsive genes required for DNA replication. To assess the value of the transcription factors E2Fs as targets for antiproliferative strategies, we have initiated a program aiming to develop inhibitors targeting specifically these proteins in vitro and in vivo. The cellular activity of E2F is the result of the heterodimeric association of two families of proteins, E2Fs and DPs, which then bind DNA. Here, we use a two hybrid approach to isolate from combinatorial libraries peptide aptamers that specifically interact with E2Fs DNA binding and dimerization domains. One of these is a potent inhibitor of E2F binding activity in vitro and in mammalian fibroblasts, blocks cells in G1, and the free variable region from this aptamer has the same effect. Our experiments argue that the variable region of this aptamer is structured, and that it functions by binding E2F with a motif that resembles a DP heterodimerization region, and blocking E2F's association with DP. These results show that cell proliferation can be inhibited using genetically-selected synthetic peptides that specifically target protein-protein interaction motifs within cell cycle regulators. These results also emphasize the critical role of the E2F pathway for cell proliferation and might allow the design of novel antiproliferative agents targeting the cyclin/CDK-pRB-E2F pathway.
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Improved LM-PCR procedure for in vivo footprinting analysis of GC-rich promoters. Biotechniques 1999; 26:840-3. [PMID: 10337472 DOI: 10.2144/99265bm08] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Timing of cyclin E gene expression depends on the regulated association of a bipartite repressor element with a novel E2F complex. EMBO J 1999; 18:1878-90. [PMID: 10202151 PMCID: PMC1171273 DOI: 10.1093/emboj/18.7.1878] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Transient induction of the cyclin E gene in late G1 gates progression into S. We show that this event is controlled via a cyclin E repressor module (CERM), a novel bipartite repressor element located near the cyclin E transcription start site. CERM consists of a variant E2F-binding site and a contiguous upstream AT-rich sequence which cooperate during G0/G1 to delay cyclin E expression until late G1. CERM binds the protein complex CERC, which disappears upon progression through G0-G1 and reappears upon entry into the following G1. CERC disappearance correlates kinetically with the liberation of the CERM module in vivo and cyclin E transcriptional induction. CERC contains E2F4/DP1 and a pocket protein, and sediments faster than classical E2F complexes in a glycerol gradient, suggesting the presence of additional components in a novel high molecular weight complex. Affinity purified CERC binds to CERM but not to canonical E2F sites, thus displaying behavior different from known E2F complexes. In cells nullizygous for members of the Rb family, CERC is still detectable and CERM-dependent repression is functional. Thus p130, p107 and pRb function interchangeably in CERC. Notably, the CERC-CERM complex dissociates prematurely in pRb-/- cells in correspondence with the premature expression of cyclin E. Thus, we identify a new regulatory module that controls repression of G1-specific genes in G0/G1.
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Cell cycle-regulated expression of mammalian CDC6 is dependent on E2F. Mol Cell Biol 1998; 18:6679-97. [PMID: 9774682 PMCID: PMC109252 DOI: 10.1128/mcb.18.11.6679] [Citation(s) in RCA: 150] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/1998] [Accepted: 08/18/1998] [Indexed: 11/20/2022] Open
Abstract
The E2F transcription factors are essential regulators of cell growth in multicellular organisms, controlling the expression of a number of genes whose products are involved in DNA replication and cell proliferation. In Saccharomyces cerevisiae, the MBF and SBF transcription complexes have functions similar to those of E2F proteins in higher eukaryotes, by regulating the timed expression of genes implicated in cell cycle progression and DNA synthesis. The CDC6 gene is a target for MBF and SBF-regulated transcription. S. cerevisiae Cdc6p induces the formation of the prereplication complex and is essential for initiation of DNA replication. Interestingly, the Cdc6p homolog in Schizosaccharomyces pombe, Cdc18p, is regulated by DSC1, the S. pombe homolog of MBF. By cloning the promoter for the human homolog of Cdc6p and Cdc18p, we demonstrate here that the cell cycle-regulated transcription of this gene is dependent on E2F. In vivo footprinting data demonstrate that the identified E2F sites are occupied in resting cells and in exponentially growing cells, suggesting that E2F is responsible for downregulating the promoter in early phases of the cell cycle and the subsequent upregulation when cells enter S phase. Our data also demonstrate that the human CDC6 protein (hCDC6) is essential and limiting for DNA synthesis, since microinjection of an anti-CDC6 rabbit antiserum blocks DNA synthesis and CDC6 cooperates with cyclin E to induce entry into S phase in cotransfection experiments. Furthermore, E2F is sufficient to induce expression of the endogenous CDC6 gene even in the absence of de novo protein synthesis. In conclusion, our results provide a direct link between regulated progression through G1 controlled by the pRB pathway and the expression of proteins essential for the initiation of DNA replication.
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Abstract
E2F-1 is the prototype of a family of transcription factors playing a central role in the control of cell proliferation and apoptosis. E2F DNA binding activity is down-regulated during cellular differentiation, which is correlated with cell division arrest. We report here that the expression of E2F-1 itself is down-regulated in the developing quail neural retina between embryonic days E8-E10. This event occurs just after the massive arrest of the quail neuroretina cell division (E7-E8). To gain further insight into the regulatory mechanisms monitoring E2F-1 expression in differentiating neurons, we have cloned the quail E2F-1 promoter. In vivo DNA footprintings of this promoter have shown that a number of potential SP-1 and C/EBP response elements are constitutively occupied in the entire quail neuroretina of E5 and E14, whereas the two consensus palindromic E2F binding sites are only protected at E5. This suggests that these E2F elements participate in down-regulation of E2F-1 gene expression during avian neuroretina development. CAT reporter assays have shown that E2F-1 in association with its partner DP-1 transactivates its own promoter, whereas p105Rb inhibits the E2F-1 promoter. Both E2F-1/DP-1 and p105Rh require the presence of the E2F binding sites to mediate their effects. However, experiments performed with deletion mutants of the promoter strongly suggest that other regions located upstream of the E2F binding sites also mediate part of the E2F-1 transactivating effect on its own promoter. Altogether, these results suggest that the down-regulation of E2F-1 gene expression in differentiating neurons could be due, in part, to the E2F/Rb complexes binding to the E2F-1 promoter.
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Abstract
Cyclin A is a positive regulatory component of kinases required for the progression through S phase and for the transition between the G2 and M phases of the cell division cycle. Previous studies have demonstrated that the promoter of its gene is under transcriptional repression in quiescent cells. Whereas the DNA sequences mediating this effect have been clearly delineated, the nature of the proteins acting in trans is still debated. Indirect observations suggest the involvement of proteins related to the retinoblastoma tumor suppressor protein (pRb). However, the precise role of these proteins has been difficult to assess, since most experiments designed to analyse their function have been carried out in transformed cell lines. Nevertheless, a current model has emerged whereby the role of the p130 protein would be restricted to resting and early G1 cells and p107, absent in quiescent cells, would be involved later in the control of the G1/S transition, whilst pRb would be effective throughout the cell cycle. We show here that cyclin A transcriptional inhibition is relieved in primary fibroblasts from pRb(-/-) embryos and not in fibroblasts from p13O(-/-), p107(-/-) or even p130(-/-)/p107(-/-) double mutant embryos. This suggests a unique role for pRb in controlling the extinction of specific genes in G0, providing thus the first example of non-overlapping functions achieved by the different pocket proteins.
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Nicotine does not modulate IL-4 and interferon-gamma release from peripheral blood mononuclear cells and T cell clones activated by phorbol myristate acetate and calcium ionophore. Int Arch Allergy Immunol 1996; 111:372-5. [PMID: 8957111 DOI: 10.1159/000237395] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Tobacco smoking induces an increased nonspecific IgE response. IgE synthesis is controlled by IL-4 and IFN-gamma. The effect of nicotine (10(-10) to 10(-5) M), one of the major components of tobacco smoke, were studied on IL-4 and IFN-gamma release by peripheral blood mononuclear cells from 12 allergic patients and 12 nonallergic subjects and 16 T cell clones stimulated by nonspecific agonists (phorbol myristate acetate and calcium ionophore). The release of IL-4 and IFN-gamma was measured by ELISA in supernatants after a 48-hour culture. Nicotine did not modify IL-4 and IFN-gamma release by peripheral blood mononuclear cells or T cell clones. The effects of tobacco smoke on IgE production are unlikely to change in the T cell phenotype by nicotine.
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Binding characteristics of seven inhibitors of human aromatase: a site-directed mutagenesis study. Cancer Res 1996; 56:3451-60. [PMID: 8758911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Aromatase, a cytochrome P450, catalyzes three consecutive hydroxylation reactions converting C19 androgens to aromatic C18 estrogenic steroids. In this study, eight human aromatase mutants (I133Y, I133W, F235L, I395F, I474Y, I474W, I474M, and I474N) were prepared to evaluate the active site and a proposed hydrophobic pocket of the enzyme that exists in an aromatase model based on the X-ray structure of cytochrome P450cam. In addition, the binding characteristics of three steroidal inhibitors [4-hydroxyandrostenedione, 7alpha-(4'-amino)phenylthio-1,4-androstandiene-3,17-dione, and bridge (2,19-methyleneoxy)androstene-3,17-dione (MDL 101,003)] and four nonsteroidal inhibitors [aminoglutethimide, CGS 20267, ICI D1033, and vorozole (R83842)] were investigated through inhibitory profile studies on the eight new and three previously generated mutants (P308F, D309A, and T310S). The latter analyses have provided a molecular basis regarding how seven aromatase inhibitors with different structures bind to the active site of aromatase.
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Mutagenesis study at a postulated hydrophobic region near the active site of aromatase cytochrome P450. J Biol Chem 1994; 269:19501-8. [PMID: 8034720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Aromatase, a cytochrome P450, catalyzes three consecutive hydroxylation reactions converting C19 androgens to aromatic C18 estrogenic steroids. On the basis of a recent computer modeling of the active site of aromatase, a hydrophobic pocket, thought to be important for the binding of some aromatase inhibitors, was predicted to extend roughly in the plane of the steroid substrate, from the position that would be occupied by its C4 and C7 atoms. Four mutants, G121A, I125N, F235N, and I474F, were generated to test this model. Although the mutagenesis results have shown that the current model for the active site of aromatase almost certainly contains a number of errors, the results are in general very satisfactory in that they suggest how the model should be altered by local realignments of the aromatase sequence with that of cytochrome P450cam. Among the mutants, I474F is the most interesting one. Its Km value for androstenedione was found to be lower than the wild type enzyme, and the kinetic analysis exhibited a substrate inhibition-like kinetic profile through an "in-cell" assay. In addition, this mutation reduces the binding affinity of an aromatase inhibitor, 4-hydroxyandrostenedione, and increases the binding affinity of two aromatase inhibitors, aminoglutethimide and CGS 16949. This study demonstrates a useful approach, by a combination of computer modeling, site-directed mutagenesis, and inhibitor binding studies, to examine the structure of the active site of aromatase and the binding nature of various aromatase inhibitors.
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Abstract
In the past decade several stochastic models for the effects of radiation on cell survival have been proposed. We survey them briefly and consider their possible application to some experimental results of Frankenberg-Schwager and co-authors on irradiated yeast. One possible model is a slight modification of the model proposed by Yang and Swenberg. It is shown that the modified model does not actually fit well and that the repair mechanism requires additional complications for adequate description.
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Discussion: On the Consistency of Bayes Estimates. Ann Stat 1986. [DOI: 10.1214/aos/1176349840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Probability Models and Cancer. Biometrics 1984. [DOI: 10.2307/2530947] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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A NOTE ON THE DISTRIBUTION OF SUMS OF INDEPENDENT RANDOM VARIABLES. Proc Natl Acad Sci U S A 1963; 50:601-3. [PMID: 16578550 PMCID: PMC221232 DOI: 10.1073/pnas.50.4.601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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