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Related Concept Videos

Spermatogenesis01:41

Spermatogenesis

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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
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Fertilization01:38

Fertilization

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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
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Infertility in Males01:23

Infertility in Males

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Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
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Spermatogenesis01:22

Spermatogenesis

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Spermatogenesis is a complex process that involves the development of sperm cells from undifferentiated stem cells in the seminiferous tubules of the testes. The process is essential for the production of mature and functional sperm cells that are capable of fertilizing an egg.
The process of spermatogenesis can be divided into mitosis, meiosis, and spermiogenesis. During mitosis, the spermatogonia or stem cells divide to produce two identical daughter cells, type A and B spermatogonia. Type-A...
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Sperm Structure and Semen Composition01:22

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During ejaculation, males release around 2-5 milliliters of semen, which is a complex mixture of mature sperm and various fluids produced by accessory glands. The mature sperm cells measure approximately 60 micrometers in length and consist of a head, neck, midpiece, and tail. The head is flattened and tapered, measuring about 4 to 5 micrometers in length. It contains a nucleus with condensed chromosomes and an acrosome, a cap-like structure filled with enzymes essential for penetrating the...
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The Y Chromosome Determines Maleness02:19

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The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
Evolution
Around 300 million years ago, the two sex chromosomes diverged from two identical autosomal chromosomes. Over time, the Y chromosome has lost most of its genes, shrinking in size....
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Sperm nuclear stability and male infertility.

S Jager1

  • 1Department of Obstetrics and Gynaecology, University Hospital, Groningen, The Netherlands.

Archives of Andrology
|January 1, 1990
PubMed
Summary

Human sperm chromatin stability varies due to protein composition, impacting DNA integrity. Abnormalities in sperm chromatin and morphology are linked to male infertility and reduced fertilization success.

Area of Science:

  • Reproductive Biology
  • Spermatozoa Research
  • Chromatin Structure

Background:

  • Human sperm nuclei exhibit unique variability compared to other Eutherian mammals.
  • This variability stems from differences in chromatin stabilizing disulfide bridges and basic protein composition (protamines, histones).
  • Abnormal chromatin states, including altered DNA configuration or content (diploidy), are associated with sperm morphological defects.

Purpose of the Study:

  • To investigate the relationship between human sperm nuclear chromatin variability and male infertility.
  • To explore the impact of abnormal chromatin on sperm morphology and fertilization capacity.
  • To understand the consequences of abnormal chromatin on subsequent embryonal development.

Main Methods:

  • Comparative analysis of sperm nuclear chromatin stability across mammalian species.

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  • Assessment of disulfide bridge content and basic protein composition in human sperm.
  • Evaluation of DNA content (haploid vs. diploid) and morphological aberrations in spermatozoa.
  • Correlation analysis between chromatin abnormalities, sperm morphology, and in vitro fertilization outcomes (implied).

    • Main Results:

    • Human sperm chromatin stability is exceptionally variable, influenced by protamine and histone variations.
    • Abnormal chromatin states, including altered DNA content and configuration, correlate with sperm head morphology.
    • Evidence suggests a strong link between abnormal sperm chromatin, reduced fertilization capacity, and impaired embryonic development.

    Conclusions:

    • Variability in human sperm chromatin structure is a significant factor in male reproductive health.
    • Abnormalities in sperm chromatin and morphology are key contributors to male infertility.
    • Compromised sperm chromatin negatively impacts fertilization potential and embryonic development, highlighting the need for further research into diagnostic and therapeutic strategies.