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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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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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The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
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Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
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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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Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
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Long-term Behavioral and Reproductive Consequences of Embryonic Exposure to Low-dose Toxicants
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Exposure to phthalates: germline dysfunction and aneuploidy.

Ayana L Henderson1, Monica P Colaiácovo1

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This summary is machine-generated.

Phthalate exposure, common in the environment, harms reproductive health by causing germline dysfunction and aneuploidy (genetic disorders). Research highlights its impact across species, emphasizing the need for risk assessment.

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Area of Science:

  • Reproductive Toxicology
  • Environmental Health
  • Genetics

Background:

  • Environmental chemicals, such as phthalates, are pervasive and impact human physiology, particularly reproductive health.
  • Phthalates are endocrine-disrupting chemicals widely used as plasticizers.
  • Exposure to phthalates is linked to increased rates of human aneuploidy, a cause of genetic disorders.

Purpose of the Study:

  • To review epidemiological and experimental studies on phthalates' role in germline dysfunction.
  • To discuss factors influencing susceptibility, such as diet and genetic polymorphisms.
  • To explore sex-specific effects and conserved mechanisms across species.

Main Methods:

  • Review of recent epidemiological studies.
  • Analysis of experimental research investigating phthalate effects.
  • Comparative analysis across human, mammalian, and nonmammalian models.

Main Results:

  • Phthalate exposure is associated with increased apoptosis, oxidative stress, DNA damage, and impaired genomic integrity, leading to aneuploidy.
  • Subject variability, influenced by diet and genetic polymorphisms, affects phthalate toxicity.
  • Sex-specific effects and conserved mechanisms of phthalate-induced reproductive issues are observed.

Conclusions:

  • Phthalates pose a significant risk to reproductive health by disrupting germline function and causing aneuploidy.
  • Understanding subject variability and sex-specific effects is crucial for accurate risk assessment.
  • Model organisms are valuable tools for elucidating mechanisms of phthalate toxicity and informing chemical risk assessment.