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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.

Cancers Originate from Somatic Mutations in a Single Cell

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...

Cancers Originate from Somatic Mutations in a Single Cell

Cancers Originate from Somatic Mutations in a Single Cell

Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...

Mitogens and the Cell Cycle

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...

Cancer-Critical Genes II: Tumor Suppressor Genes

Cancer-Critical Genes II: Tumor Suppressor Genes

Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...

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Related Experiment Video

Updated: Jun 18, 2026

Methylated DNA Immunoprecipitation

Methylated DNA Immunoprecipitation

Published on: January 2, 2009

[Germ-line epimutations and human cancer].

Pu-Yuan Wu¹, Yi-Mei Fan, Ya-Ping Wang

¹Department of Medical Genetics,Medical School, Nanjing University,Nanjing, Jiangsu 210093, P. R. China.

AI Zheng = Aizheng = Chinese Journal of Cancer

|December 5, 2009

Summary

Germ-line epimutations, errors in epigenetic regulation, can occur during early development and impact human diseases. These findings suggest their importance is comparable to germ-line mutations.

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Transmitochondrial Cybrid Generation Using Cancer Cell Lines

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Published on: March 17, 2023

Area of Science:

Epigenetics
Genetics
Cancer Biology

Background:

Epimutations are epigenetic regulation errors, typically somatic.
Recent studies reveal MLH1 gene hypermethylation in hereditary nonpolyposis colorectal cancer (HNPCC) patients across all tissues.
Germ-line epimutations in tumor suppressor genes (TSGs) like MSH2 and BRCA1 have been identified.

Purpose of the Study:

To review current understanding of germ-line epimutations in tumor suppressor genes.
To explore mechanisms, transgenerational inheritance, and disease implications of germ-line epimutations.

Main Methods:

Literature review of recent studies on germ-line epimutations.
Analysis of epigenetic alterations in hereditary cancer syndromes.
Examination of evidence for germ-line origin and inheritance of epimutations.

Main Results:

Epimutations can arise in the germ-line, affecting TSGs.
Allele-specific hypermethylation of MLH1 promoter CpG islands observed in HNPCC patients' tissues.
Germ-line epimutations may play a significant role in human diseases.

Conclusions:

Germ-line epimutations are a crucial factor in human disease, potentially as significant as germ-line mutations.
Understanding germ-line epimutations offers new insights into disease etiology and inheritance.
Further research into mechanisms and inheritance patterns of germ-line epimutations is warranted.