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Related Concept Videos

Genomic Imprinting and Inheritance02:30

Genomic Imprinting and Inheritance

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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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Inheritance of Chromatin Structures03:17

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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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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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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
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Inheritance01:25

Inheritance

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Gregor Mendel's pioneering work on the principles of inheritance fundamentally transformed our understanding of how traits are transmitted from generation to generation. His experiments with pea plants laid the groundwork for the discovery of genes, discrete units within organisms that control heredity.
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Position-effect Variegation02:32

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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Noncanonical imprinting: intergenerational epigenetic inheritance mediated by Polycomb complexes.

Azusa Inoue1

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Genomic imprinting involves epigenetic inheritance, where parental genomes gain modifications for monoallelic gene expression. Noncanonical imprinting, regulated by H3K27me3, offers insights into chromatin regulation and epigenetic anomalies.

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Area of Science:

  • Epigenetics and Developmental Biology
  • Genomics and Chromatin Regulation

Background:

  • Genomic imprinting is a key example of intergenerational epigenetic inheritance in mammals.
  • Epigenetic modifications during early development lead to imprinted monoallelic gene expression.
  • Noncanonical imprinting involves maternal inheritance of H3K27me3, a histone modification.

Purpose of the Study:

  • To summarize current knowledge on noncanonical imprinting.
  • To highlight the role of Polycomb repressive complexes in establishing and maintaining noncanonical imprints.
  • To discuss implications for chromatin regulation, X-chromosome inactivation, and cloned mouse anomalies.

Main Methods:

  • Review of recent studies on noncanonical imprinting.
  • Analysis of epigenetic modifications (H3K27me3) during oogenesis and early embryogenesis.
  • Comparative analysis with analogous mechanisms in other species.

Main Results:

  • Noncanonical imprinting is established by Polycomb repressive complexes during oogenesis.
  • This imprinting is maintained in preimplantation embryos and extraembryonic tissues like the placenta.
  • Recent research has advanced understanding of oocyte chromatin, early embryo development, and cloned mouse issues.

Conclusions:

  • Noncanonical imprinting provides a model for understanding epigenetic inheritance and chromatin regulation.
  • The mechanisms of noncanonical imprinting have parallels in invertebrates and plants.
  • Further research is crucial for understanding developmental anomalies and reproductive technologies.