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Genomic Imprinting and Inheritance02:30

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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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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
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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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Single Oocyte Bisulfite Mutagenesis
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Multilocus methylation defects in imprinting disorders.

Deborah J G Mackay, Thomas Eggermann, Karin Buiting

    Biomolecular Concepts
    |January 13, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Mammals have two sets of chromosomes, but imprinted genes are expressed only from the mother or father. DNA methylation is key to regulating these genes and preventing congenital imprinting disorders.

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    Area of Science:

    • Genetics
    • Epigenetics
    • Developmental Biology

    Background:

    • Mammals inherit autosomal genes from both parents, typically expressed from both alleles.
    • Imprinted genes, however, show parent-of-origin-specific expression, crucial for normal development.
    • Defects in imprinted gene regulation are linked to several human genetic diseases.

    Purpose of the Study:

    • To understand the functions of DNA methylation in mammalian development.
    • To identify epigenetic mechanisms regulating imprinted genes.
    • To investigate common mechanisms in human congenital imprinting disorders.

    Main Methods:

    • Analysis of DNA methylation patterns.
    • Investigation of gene expression from parental alleles.
    • Comparative analysis of epigenetic mechanisms across imprinting disorders.

    Main Results:

    • Identified DNA methylation as a primary regulator of imprinted gene expression.
    • Characterized parent-of-origin-specific allele expression.
    • Found common epigenetic mechanisms underlying eight human congenital imprinting disorders.

    Conclusions:

    • DNA methylation is essential for regulating imprinted genes critical for mammalian development.
    • Understanding these mechanisms provides insights into congenital imprinting disorders.
    • Identified shared (epi)genetic pathways involved in human imprinting diseases.