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Related Concept Videos

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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Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
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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.
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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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Genome Copying Errors02:46

Genome Copying Errors

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DNA replication is a well-evolved process that copies millions of base pairs with high fidelity during each cell division. Occasionally a wrong base or a long stretch of wrong bases may get added to the daughter strands. If the errors are left unchecked, cells might accumulate several mutations that might endanger their  survival. Therefore, the copying errors are checked and repaired at three levels.
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Chromosomal Spread Preparation of Human Embryonic Stem Cells for Karyotyping
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Chromosomal Aberrations As a Biological Phenomenon in Human Embryonic Development.

A D Ivanova1, M L Semenova1

  • 1Lomonosov Moscow State University, Biological Faculty, Moscow, 119991 Russian Federation.

Acta Naturae
|November 1, 2023
PubMed
Summary

Chromosomal abnormalities are common in early mammalian embryo development, impacting embryo viability. This review explores biological causes of these errors, including oocyte meiosis and early cell divisions, and potential self-correction mechanisms.

Keywords:
aneuploidychromosomal mosaicismpreimplantation development

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Genetics

Background:

  • Chromosomal abnormalities, including aneuploidy and mosaicism, are frequent in early mammalian embryonic development.
  • These abnormalities are linked to reproductive challenges such as failed implantation and spontaneous abortions.
  • While clinical factors are implicated, biological mechanisms underlying chromosomal errors require further investigation.

Purpose of the Study:

  • To review the biological mechanisms contributing to chromosomal abnormalities during early embryonic development.
  • To analyze the impact of oocyte meiosis and early cleavage divisions on embryo genetic integrity and viability.
  • To discuss the potential for self-correction of chromosomal status in early embryos.

Main Methods:

  • Literature review focusing on biological mechanisms of chromosomal abnormalities.
  • Analysis of events during oocyte meiosis and first embryonic cleavage divisions.
  • Synthesis of current data on early embryo chromosomal status and self-correction.

Main Results:

  • Oocyte meiosis and early cleavage divisions are critical stages prone to chromosomal errors.
  • These errors can significantly affect oocyte and subsequent embryo viability.
  • Early embryos may possess mechanisms for self-correction of chromosomal abnormalities.

Conclusions:

  • Biological factors during oocyte maturation and early embryonic cell division are key drivers of chromosomal abnormalities.
  • Understanding these mechanisms is crucial for assessing embryo viability and addressing reproductive failures.
  • The potential for self-correction warrants further research into early embryonic development.