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Epigenetic Regulation01:37

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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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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
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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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Human genetics provides a profound framework for understanding the interplay between genetic predispositions and human psychology. At the heart of this discipline lies the study of how genes influence physical traits, behaviors, and susceptibility to diseases. Each person carries a unique genetic code that subtly or significantly shapes their psychological and behavioral landscape.
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Transgenerational Epigenetic DNA Methylation Editing and Human Disease.

Joshua D Tompkins1

  • 1Department of Diabetes Complications and Metabolism, Arthur Riggs Diabetes and Metabolism Research Institute, City of Hope, Duarte, CA 91010, USA.

Biomolecules
|December 23, 2023
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Summary

Environmental exposures during pregnancy can alter DNA methylation patterns, potentially affecting future generations. This research explores transgenerational epigenetics and methods for correcting heritable epigenetic changes.

Keywords:
DNA methylationcytosinedCasdevelopmentepigenetic editingepigeneticsepimutationgermlineheritabletransgenerational

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Area of Science:

  • Epigenetics
  • Developmental Biology
  • Genomics

Background:

  • Maternal, embryonic, and germ cell genomes can be exposed to environmental factors during gestation.
  • Environmental insults can lead to DNA methylation (DNAme) changes that escape normal erasure and influence disease propensity transgenerationally.
  • Mammalian development involves significant genomic reorganization and widespread DNA demethylation.

Purpose of the Study:

  • To review concepts of transgenerational epigenetics.
  • To discuss recent advancements in programming transgenerational DNA methylation.
  • To explore a framework for editing heritable DNA methylation patterns and associated challenges.

Main Methods:

  • Review of existing literature on transgenerational epigenetics.
  • Discussion of experimental approaches for manipulating DNA methylation.
  • Analysis of the heritability and potential correction of epigenetic marks.

Main Results:

  • Evidence suggests that DNA methylation patterns can be inherited across generations.
  • Some environmentally induced DNA methylation changes may persist despite germline erasure.
  • The study highlights the potential for targeted interventions to modify heritable epigenetic patterns.

Conclusions:

  • Transgenerational epigenetic inheritance is a significant factor in disease predisposition.
  • Developing methods to edit heritable DNA methylation is crucial for therapeutic applications.
  • Ethical considerations are paramount in human transgenerational epigenetic research.