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Polytene Chromosomes02:04

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Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also...
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The seminal work of Ohno in 1970 popularized the idea of gene duplication and divergence. DNA sequence comparison studies reveal that a large portion of the genes in bacteria, archaebacteria, and eukaryotes was  generated by gene duplication and divergence, indicating its critical role in evolution.
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Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold...
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During meiosis, chromosomes occasionally separate improperly. This occurs due to failure of homologous chromosome separation during meiosis I or failed sister chromatid separation during meiosis II. In some species, notably plants, nondisjunction can result in an organism with an entire additional set of chromosomes, which is called polyploidy. In humans, nondisjunction can occur during male or female gametogenesis and the resulting gametes possess one too many or one too few chromosomes.
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Manipulation of Ploidy in Caenorhabditis elegans
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Polyploidy: adaptation to the genomic environment.

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    The New Phytologist
    |March 3, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Whole genome duplication (WGD) provides raw material for adaptation, but polyploidy challenges cellular functions. Recent studies reveal mechanisms stabilizing genome transmission in new polyploids, offering insights into WGD adaptation.

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    Area of Science:

    • Genomics
    • Evolutionary Biology
    • Plant Science

    Background:

    • Whole genome duplication (WGD) and polyploidy are common in eukaryotes, particularly plants.
    • Polyploidy offers adaptive advantages through gene duplication and buffering effects.
    • However, polyploidy significantly disrupts cellular functions, posing a genomic challenge.

    Purpose of the Study:

    • To review recent advancements in understanding stable meiosis re-establishment in newly evolved polyploids.
    • To explore the mechanisms enabling stable genome transmission in polyploid species.
    • To provide a framework for studying polyploid responses to WGD.

    Main Methods:

    • Review of recent research on polyploid plant species.
    • Focus on studies investigating the stabilization of meiosis.
    • Comparative analysis across diverse taxa.

    Main Results:

    • Identified key mechanisms underlying the stabilization of genome transmission in polyploids.
    • Revealed significant parallels in these stabilization mechanisms across different plant species.
    • Provided insights into how polyploids overcome genomic challenges post-WGD.

    Conclusions:

    • Stable meiosis is re-established through conserved mechanisms in diverse polyploids.
    • Understanding these mechanisms is crucial for comprehending polyploid adaptation.
    • This research offers a roadmap for future investigations into WGD responses.