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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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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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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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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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Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
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Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
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Human inversions and their functional consequences.

Marta Puig, Sònia Casillas, Sergi Villatoro

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    |May 23, 2015
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    Summary
    This summary is machine-generated.

    Polymorphic inversions, though hard to study, impact human health and evolution. Understanding these structural variants is crucial for genetic research and disease association studies.

    Keywords:
    diseaseevolutiongene expressionhuman genomeinversionsphenotypic effects

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    Area of Science:

    • Genomics
    • Human Genetics
    • Structural Variation Analysis

    Background:

    • Polymorphic inversions are challenging structural variants due to their balanced nature and complex breakpoint regions.
    • Limited detailed studies exist on human inversions, with restricted knowledge of their functional impacts.
    • Inversions are linked to phenotypic changes and adaptation across various species.

    Purpose of the Study:

    • To review and summarize evidence for the functional impact of inversions in the human genome.
    • To highlight the significance of inversions in human health, evolution, and genetic studies.

    Main Methods:

    • Review of existing literature on polymorphic inversions in the human genome.
    • Analysis of studies demonstrating the functional consequences of inversions.
    • Examination of evidence for recombination inhibition, disease association, and natural selection.

    Main Results:

    • Inversions inhibit recombination, potentially leading to independent evolution of chromosomes and distinct gene expression patterns.
    • Inversions act as disease-causing mutations by altering gene structure/regulation and predisposing carriers to secondary rearrangements.
    • Several human inversions exhibit signals of positive selection during evolutionary history.

    Conclusions:

    • Polymorphic inversions possess significant potential for phenotypic consequences in humans.
    • The inclusion of inversions in genome-wide association studies is essential for comprehensive genetic analysis.
    • Further research into human inversions is critical for understanding genetic diversity and disease etiology.