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Related Concept Videos

Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Nondisjunction01:29

Nondisjunction

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.
Nondisjunction01:29

Nondisjunction

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.
Nondisjunction01:21

Nondisjunction

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 sister...
Sex-linked Disorders01:43

Sex-linked Disorders

Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.

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Spectral Karyotyping to Study Chromosome Abnormalities in Humans and Mice with Polycystic Kidney Disease
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Published on: February 3, 2012

Klinefelter syndrome.

Anne M Wikström1, Leo Dunkel

  • 1HUCH, Hospital for Children and Adolescents, Helsinki University Central Hospital, P.O. Box 281, FI-00029 Helsinki, Finland. anne.wikstrom@hus.fi

Best Practice & Research. Clinical Endocrinology & Metabolism
|March 15, 2011
PubMed
Summary
This summary is machine-generated.

Klinefelter syndrome (KS), the most common genetic cause of male hypogonadism, presents subtle symptoms in childhood. Adult males with KS often require testosterone therapy due to hypergonadotropism and androgen deficiency.

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Area of Science:

  • Endocrinology
  • Genetics
  • Reproductive Medicine

Background:

  • Klinefelter syndrome (KS) is the most common genetic cause of male hypogonadism.
  • Overt symptoms of KS typically manifest after puberty, with pituitary-gonadal function changes occurring from midpuberty onwards.

Purpose of the Study:

  • To describe the progression of pituitary-gonadal function and testicular histology in Klinefelter syndrome.
  • To highlight the implications for hormone replacement therapy and fertility treatments in KS patients.

Main Methods:

  • Review of pituitary-gonadal hormone levels (FSH, LH, inhibin B, testosterone) at different pubertal stages.
  • Analysis of testicular biopsy findings in prepubertal and adult KS males.
  • Discussion of reproductive technologies like testicular sperm extraction (TESE) and intracytoplasmic sperm injection (ICSI).

Main Results:

  • In childhood and early puberty, pituitary-gonadal function is relatively normal.
  • From midpuberty, KS subjects exhibit hypergonadotropism (elevated FSH and LH), decreased inhibin B, and plateauing testosterone levels.
  • Adult testes show fibrosis, hyalinization of seminiferous tubules, and interstitial hyperplasia, though residual spermatogenesis may be present.

Conclusions:

  • Adult Klinefelter syndrome is characterized by hypergonadotropism and potential androgen deficiency, necessitating testosterone substitution therapy.
  • Despite testicular changes, assisted reproductive technologies like TESE/ICSI enable fertility in non-mosaic KS males.