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Epigenetic Regulation01:37

Epigenetic Regulation

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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.
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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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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Chromatin modification alters gene expression; therefore, scientists can add histone-modifying enzymes, histone variants, and chromatin remodeling complexes to somatic cells to aid reprogramming into pluripotent stem (iPS) cells.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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[Epigenetic abnormalities in non-Hodgkin lymphomas].

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[Rinsho Ketsueki] the Japanese Journal of Clinical Hematology
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Epigenetic alterations, including DNA methylation and histone modifications, drive hematological malignancies. Targeting these epigenetic changes offers promising therapeutic strategies for cancers like T-cell lymphomas.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cancer Research

Background:

  • Epigenetics regulates gene expression via DNA sequence-independent mechanisms.
  • Key epigenetic processes include histone modifications (acetylation, methylation) and DNA methylation.
  • These modifications influence chromatin structure, impacting gene transcription.

Purpose of the Study:

  • To explore the role of epigenetic abnormalities in hematological malignancies.
  • To highlight specific epigenetic alterations in T-cell lymphomas.
  • To discuss the therapeutic potential of targeting epigenetic mechanisms.

Main Methods:

  • Review of epigenetic mechanisms.
  • Analysis of mutations in DNA methyltransferase (DNMT3A) and DNA demethylase (TET2).
  • Examination of epigenetic alterations in preleukemic stem cells and T-cell lymphomas.

Main Results:

  • Mutations in DNMT3A or TET2 can lead to preleukemic stem cells.
  • These preleukemic cells can develop into T-cell lymphomas.
  • Histone acetylation generally activates transcription, while DNA methylation typically represses it.

Conclusions:

  • Epigenetic dysregulation is a critical factor in hematological cancer development.
  • Epigenetic alterations represent viable therapeutic targets.
  • Existing epigenetic drugs (HDAC inhibitors, demethylating agents) show efficacy in treating peripheral T-cell lymphomas, with more anticipated.