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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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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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[Trisomy 18: how lethal is 'lethal'?]

M A Brouwer1, E L M Maeckelberghe, M A F B M van der Hoeven

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Summary
This summary is machine-generated.

Active treatment for children with trisomy 18 may be viable. A case study challenges the standard Dutch approach of termination or passive care, suggesting a need to reconsider treatment options for this condition.

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Area of Science:

  • Medical ethics
  • Genetics
  • Pediatrics

Background:

  • Trisomy 18 is often considered a lethal condition in the Netherlands.
  • Current Dutch guidelines recommend pregnancy termination or passive care for trisomy 18.
  • This approach has historically led to limited medical intervention for affected children.

Observation:

  • A specific case involving a child with trisomy 18 is presented.
  • This case prompted a re-evaluation of the condition's prognosis by medical professionals and parents.
  • The case highlighted potential limitations in the established clinical pathway.

Findings:

  • The presented case suggests that active treatment might be a feasible option for children with trisomy 18.
  • Rethinking the perception of trisomy 18 is crucial for improving patient care.
  • Challenging the assumption of lethality can open doors to new therapeutic strategies.

Implications:

  • This case study advocates for a shift in the Dutch approach to trisomy 18 management.
  • It encourages a broader discussion on the ethical and medical considerations of active treatment for genetic disorders.
  • Further research into the outcomes of active interventions for trisomy 18 is warranted.