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Epigenetic Regulation

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...

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Epigenetic Regulation

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.

Inheritance of Chromatin Structures

Inheritance of Chromatin Structures

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 DNA...

Histone Modification

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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...

Histone Modification

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.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...

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Three epigenetic information channels and their different roles in evolution.

N Shea¹, I Pen, T Uller

¹Faculty of Philosophy and Somerville College, University of Oxford, Oxford, UK.

Journal of Evolutionary Biology

|April 21, 2011

Summary

Epigenetic inheritance offers adaptive information through selection-based and detection-based effects. These mechanisms have different evolutionary implications for unicellular versus multicellular organisms, highlighting the need for distinction.

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Area of Science:

Evolutionary biology
Epigenetics
Genetics

Background:

Transgenerational epigenetic inheritance is increasingly recognized across diverse taxa.
The evolutionary consequences of these inheritance mechanisms are not fully understood.

Purpose of the Study:

To differentiate the functional roles of epigenetic mechanisms in transgenerational inheritance.
To explore the evolutionary implications of these distinct epigenetic functions in different organisms.

Main Methods:

Conceptual analysis of epigenetic inheritance mechanisms.
Distinguishing between selection-based and detection-based epigenetic effects.
Comparing implications for unicellular and multicellular organisms.

Main Results:

Epigenetic mechanisms serve dual functions: selection-based (adaptive information via reliable transmission) and detection-based (transgenerational plasticity).
Selection-based epigenetic information is more prone to conflict with somatic cell inheritance in multicellular organisms.
Detection-based epigenetic information exhibits less conflict with somatic cell inheritance.

Conclusions:

The evolutionary impact of epigenetic inheritance differs significantly between unicellular and multicellular life.
Distinguishing between selection-based and detection-based transgenerational epigenetic effects is crucial for both conceptual clarity and empirical research.