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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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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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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Related Experiment Video

Updated: Jun 7, 2025

Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues
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Microsatellite DNA Genotyping and Flow Cytometry Ploidy Analyses of Formalin-fixed Paraffin-embedded Hydatidiform Molar Tissues

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Trisomy 16 mimicking hydatidiform mole.

Lajos Gergely, Miroslav Korbeľ, Ľudovít Danihel

    Ceska Gynekologie
    |November 13, 2024
    PubMed
    Summary

    Early miscarriage diagnosis can be challenging. Genetic analysis is crucial to differentiate between a partial hydatidiform mole and trisomy 16, which mimics abnormal placental morphology.

    Keywords:
    AneuploidyDNA analysisplacental histomorphologytrisomy 16

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    Area of Science:

    • Reproductive Medicine
    • Genetics
    • Pathology

    Background:

    • Clinical suspicion of complete hydatidiform mole in a first-trimester miscarriage.
    • Initial histopathological and immunohistochemical analyses suggested a partial hydatidiform mole.

    Purpose of the Study:

    • To investigate the accurate diagnosis of a suspected hydatidiform mole in early miscarriage.
    • To determine the role of genetic analysis in differentiating placental abnormalities.

    Main Methods:

    • Histopathological and immunohistochemical analyses.
    • Genetic analysis including biparental genome composition assessment.
    • Karyotyping for chromosomal abnormalities.

    Main Results:

    • Histomorphology was consistent with a partial hydatidiform mole.
    • Genetic analysis excluded partial hydatidiform mole due to biparental genome.
    • Trisomy of chromosome 16 was detected, a known cause of early abortion with abnormal placental morphology.

    Conclusions:

    • Trisomy 16 can present with placental histomorphology mimicking a partial hydatidiform mole.
    • Genetic analysis is essential for accurate diagnosis and appropriate management of early pregnancy loss.
    • Correct diagnosis impacts follow-up and prognosis for future pregnancies.