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Related Concept Videos

Nondisjunction01:29

Nondisjunction

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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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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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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Meiosis I01:49

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Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by...
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Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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Manipulation of Ploidy in Caenorhabditis elegans
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Functional consequences of somatic polyploidy in development.

Gabriella S Darmasaputra1, Lotte M van Rijnberk1, Matilde Galli1

  • 1Hubrecht Institute, Royal Netherlands Academy of Arts and Sciences and University Medical Center Utrecht, Uppsalalaan 8, 3584 CT, Utrecht, the Netherlands.

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Summary
This summary is machine-generated.

Polyploid cells, with multiple genome copies, are vital for development and tissue function. This review explores their diverse roles, comparing programmed and stress-induced polyploidy.

Keywords:
CancerCell sizeGene expressionPolyploidy

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Polyploid cells, containing multiple copies of their genome, are a natural occurrence in many animal tissues during development.
  • While essential for tissue integrity and function, polyploidy can also result from cell division errors, DNA damage, or tissue injury.
  • The consequences of polyploidization at cellular and tissue levels are varied, yet functional similarities exist across different polyploid cell types.

Approach:

  • This review synthesizes existing research on polyploid cells within developmental contexts.
  • It highlights convergent functional roles observed in distinct polyploid cell populations.
  • The study differentiates between polyploidy that is developmentally programmed and that which is induced by stress.

Key Points:

  • Polyploidy plays a regulated role in normal development across various animal tissues.
  • Stress-induced polyploidy can arise from events like DNA damage or tissue injury.
  • Despite diverse origins and consequences, common functional themes emerge among different polyploid cells and tissues.

Conclusions:

  • Understanding polyploidy's contribution to cell and tissue function is crucial.
  • Comparing developmentally programmed and stress-induced polyploidy reveals important distinctions and parallels.
  • Further research into polyploid cell biology can illuminate fundamental processes in development and tissue homeostasis.