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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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Spermatogenesis01:41

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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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Related Experiment Video

Updated: Sep 16, 2025

Using Mouse Oocytes to Assess Human Gene Function During Meiosis I
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Sperm-Derived Dysfunction of Human Embryos: Molecular Mechanisms and Clinical Resolution.

Jan Tesarik1, Raquel Mendoza Tesarik1

  • 1MARGen (Molecular Assisted Reproductiona and Genetics) Clinic, 18006 Granada, Spain.

International Journal of Molecular Sciences
|July 12, 2025
PubMed
Summary

Sperm factors like PLCζ, centrioles, DNA, and RNA are crucial for embryo development. Deficiencies can lead to infertility and developmental issues, with some problems being difficult to diagnose or treat.

Keywords:
DNARNAcentriolediagnosisembryo developmentoocyte activationsperm factortreatment

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Area of Science:

  • Reproductive biology
  • Spermatozoa function
  • Embryonic development

Background:

  • Spermatozoa deliver essential factors beyond the male genome to the oocyte.
  • Deficiencies in these factors, including phospholipase C zeta (PLCζ), centrioles, DNA, and RNA, can cause embryo dysfunction and developmental abnormalities.

Purpose of the Study:

  • To review the critical roles of sperm factors in oocyte activation and early embryonic development.
  • To highlight the consequences of sperm factor dysfunction on reproductive outcomes.
  • To discuss current diagnostic and therapeutic approaches for sperm-related issues.

Main Methods:

  • Review of existing literature on sperm factors and their impact on fertilization and development.
  • Discussion of diagnostic methods such as heterologous ICSI, genetic testing for PLCZ1 mutations, and sperm transcriptome sequencing.
  • Overview of current treatment strategies for sperm DNA fragmentation and oocyte activation defects.

Main Results:

  • Sperm PLCζ regulates oocyte activation via calcium oscillations.
  • Sperm centrioles are vital for centrosome formation and early embryonic divisions.
  • Sperm DNA fragmentation and epigenetic dysregulation (histone methylation, non-coding RNAs) contribute to aneuploidy and developmental arrest.
  • Dysfunction in these sperm components can lead to implantation failure, miscarriage, and offspring diseases.

Conclusions:

  • Sperm factors play a multifaceted role in successful reproduction.
  • While some sperm issues are diagnosable and treatable (e.g., DNA fragmentation), others, particularly RNA-related problems, lack effective clinical therapies.
  • Further research is needed to develop diagnostic tools and treatments for a wider range of sperm dysfunctions.