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Updated: Jun 1, 2025

Immunostaining for DNA Modifications: Computational Analysis of Confocal Images
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Immunostaining for DNA Modifications: Computational Analysis of Confocal Images

Published on: September 7, 2017

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基因甲基化影响基因表达,但不影响大肠杆菌中的全球染色质结构

Willow Jay Morgan1, Haley M Amemiya2,3, Lydia Freddolino1,2,4

  • 1Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor, MI 48109, USA.

bioRxiv : the preprint server for biology
|January 20, 2025
PubMed
概括

大肠杆菌中Dam和Dcm酶的DNA甲基化不会改变全球色素结构. 虽然局部甲基化影响蛋白质占用,但它不会改变转录,基因表达的变化是间接产生的.

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Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
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Histone Modification

The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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