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Critical Reviews™ in Eukaryotic Gene Expression

Erscheint 6 Ausgaben pro Jahr

ISSN Druckformat: 1045-4403

ISSN Online: 2162-6502

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.6 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 2.2 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00058 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.345 SNIP: 0.46 CiteScore™:: 2.5 H-Index: 67

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Regulation of the Chicken Lysozyme Locus in Transgenic Mice

Volumen 6, Ausgabe 2-3, 1996, pp. 285-297
DOI: 10.1615/CritRevEukarGeneExpr.v6.i2-3.90
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ABSTRAKT

The chicken lysozyme locus is transcriptionally activated during macrophage differentiation. Each cis-regulatory element has its unique activation stage during cell differentiation, whereby maximal transcriptional activity of the gene is only observed when all cis-elements are active. The complete chicken lysozyme locus is expressed position independently and at a high level in macrophages of transgenic mice. For correct transgene regulation, the cooperation of all cis-regulatory elements is required. These cis-regulatory elements specify the mode of regulation and we observe the same expression pattern of the transgene in the mouse and the endogenous gene in chicken macrophages. This indicates that the transcription factors responsible for chicken lysozyme regulation are highly conserved in evolution. The endogenous mouse lysozyme gene is regulated differently. The chromatin of the lysozyme locus is highly structured in the transcriptionally active, as well as in the inactive state. The transcriptional activation of the lysozyme locus is accompanied by extensive chromatin rearrangements, which are disturbed when one essential cis-regulatory element is deleted and the transgenes are subjects to genomic position effects. Based on these results, we propose that a distinct chromatin architecture of a gene locus is required for its correct activation.

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