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Related Concept Videos

Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

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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.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
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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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Nondisjunction01:21

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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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Pleiotropy01:33

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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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Meiosis I03:09

Meiosis I

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Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
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Mosaic Zebrafish Transgenesis for Functional Genomic Analysis of Candidate Cooperative Genes in Tumor Pathogenesis
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Somatic mosaicism and disease.

Steven A Frank1

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697-2525, USA.

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Summary
This summary is machine-generated.

Somatic mutations accumulate with cell division, creating mosaicism. This variability in mutant cell frequency between individuals may explain diverse disease risks, particularly for cancer and neurodegenerative diseases.

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Area of Science:

  • Genetics
  • Genomics
  • Cell Biology

Background:

  • Human development involves numerous cell divisions, leading to the accumulation of somatic mutations.
  • These mutations result in individuals being somatic mosaics, with varying proportions of cells carrying genetic alterations.
  • Genomic technologies enable the measurement of somatic diversity, confirming high mutation levels within individuals.

Purpose of the Study:

  • To investigate the extent of somatic mosaicism variability between individuals.
  • To determine the relationship between the fraction of cells with predisposing mutations and disease risk.
  • To explore non-DNA mutation heritable somatic changes and their molecular links to disease.

Main Methods:

  • Leveraging recent advances in genomic technology to measure somatic diversity.
  • Analyzing the frequency of somatic mutations within and between individuals.
  • Correlating somatic mutation levels with disease incidence and progression.

Main Results:

  • Initial studies confirm significant levels of somatic mutations within individuals.
  • Theoretical predictions suggest substantial inter-individual variation in mutant cell frequency.
  • This variability is hypothesized to underlie differences in disease risk.

Conclusions:

  • Somatic mosaicism is a significant factor in individual health.
  • Variability in somatic mutation burden may explain differential susceptibility to diseases like cancer and neurodegeneration.
  • Early life somatic mutations could establish risk for late-life diseases.