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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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Nondisjunction01:21

Nondisjunction

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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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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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Meiosis II01:57

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis I01:49

Meiosis I

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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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In Vitro Fertilization01:24

In Vitro Fertilization

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In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...
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Related Experiment Video

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Mouse Round Spermatid Injection
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Low birth defects by deselecting abnormal spermatozoa before ICSI.

Nino Guy Cassuto1, André Hazout1, Dominique Bouret1

  • 1Art Unit, Drouot Laboratory, Drouot Street, Paris 75009, France.

Reproductive Biomedicine Online
|November 26, 2013
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Summary

Intracytoplasmic sperm injection (ICSI) is linked to birth defects. Morphologically selected sperm injection (IMSI) significantly reduced major malformations in infants compared to standard ICSI, highlighting sperm selection benefits.

Keywords:
ICSIIMSIbirth defectshigh magnificationsperm head

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Area of Science:

  • Reproductive Medicine
  • Developmental Biology
  • Genetics

Background:

  • Assisted reproductive technologies, including intracytoplasmic sperm injection (ICSI), are associated with an elevated risk of major birth defects.
  • The specific impact of sperm morphology selection on these risks remains an area of investigation.

Purpose of the Study:

  • To compare the risk of major malformations in infants conceived via standard ICSI versus ICSI using morphologically selected spermatozoa (IMSI).

Main Methods:

  • A prospective, population-based study conducted between 2005 and 2010.
  • Inclusion of 1028 infants born after ICSI or IMSI procedures.
  • Independent physician assessment of major malformations over a 2-year follow-up period.

Main Results:

  • A significantly lower rate of major malformations was observed in the IMSI group (1.33%) compared to the ICSI group (3.80%).
  • The reduced risk with IMSI persisted after multivariate adjustment (adjusted odds ratio 0.35).
  • An increased risk of malformations was noted in boys conceived via ICSI.

Conclusions:

  • Intracytoplasmic injection of morphologically selected spermatozoa (IMSI) is associated with a significantly decreased risk of major birth defects compared to standard ICSI.
  • These findings underscore the beneficial impact of enhanced sperm selection prior to ICSI in reducing adverse outcomes.
  • Further research may elucidate the specific mechanisms underlying this protective effect.