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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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Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
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Men's health issues are increasingly recognized as significant, with several conditions posing common threats. Among these, testicular cancer is especially prevalent in younger men, particularly those aged 20 to 35 years. The disease often manifests as a painless mass in the testicles, sometimes accompanied by a sensation of heaviness or a dull ache.
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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.
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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Azoospermia factor and male infertility.

Eitetsu Koh1, Ho-Su Sin1, Masato Fukushima1

  • 1Department of Integrated Cancer Therapy and Urology, Andrology Unit Kanazawa University Graduate School of Medical Science 13-1 Takara-machi 920-8641 Kanazawa Japan.

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Azoospermia factor (AZF) microdeletions on the Y chromosome cause male infertility. This review details updated AZF deletion categories and their diagnostic implications for infertile men.

Keywords:
AZFIntrachromosomal recombinationMale infertilityPalindromeY chromosome

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Area of Science:

  • Genetics
  • Reproductive Biology
  • Human Molecular Genetics

Background:

  • Azoospermia factor (AZF) microdeletions are a primary genetic cause of male infertility.
  • These deletions arise from homologous recombination within specific Y chromosome gene regions.

Purpose of the Study:

  • To review the complexity of the Y chromosome and its impact on AZF deletions.
  • To discuss the modified classification of AZF deletion regions.
  • To highlight the clinical significance of Y chromosome deletions in male infertility.

Main Methods:

  • Review of existing scientific literature on Y chromosome structure and AZF deletions.
  • Analysis of updated classifications based on Y chromosome sequencing.
  • Examination of the association between deletions, haplogroups, and infertility.

Main Results:

  • Y chromosome structure determination led to a revised AZF deletion classification into five regions.
  • Partial AZFc deletions, linked to sub-ampliconic recombination, have been identified.
  • A potential association between Y chromosome deletions and haplogroups is noted.

Conclusions:

  • Understanding Y chromosomal complexity and AZF deletion categories is crucial for diagnosing male infertility.
  • These findings impact genetic counseling and treatment strategies, especially for intracytoplasmic sperm injection candidates.