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Impaired spermatogenesis: an unrecognized feature of cartilage-hair hypoplasia
O M Mäkitie1, P J Tapanainen, L Dunkel
1Hospital for Children and Adolescents, University of Helsinki, Finland. outi.makitie@helsinki.fi
Insights
Cartilage-hair hypoplasia (CHH) affects cell proliferation, impacting spermatogenesis in adult males. This study found impaired sperm production in CHH patients, indicating a broader cellular defect.
Area of Science:
- Genetics
- Reproductive Medicine
- Cell Biology
Background:
- Cartilage-hair hypoplasia (CHH) is an autosomal recessive disorder causing growth failure, hair hypoplasia, immune deficiency, and anemia.
- These symptoms suggest a potential generalized defect in cellular proliferation.
Purpose of the Study:
- To investigate if cell proliferation defects in CHH extend to spermatogenesis.
- To analyze the fertility and reproductive health of adult males with CHH.
Main Methods:
- Clinical examination of 11 adult males with CHH, assessing testicular volume and other characteristics.
- Analysis of serum hormone levels (testosterone, inhibin B, gonadotropins) and semen parameters (sperm concentration, motility, morphology).
Main Results:
- Some patients exhibited subnormal testicular size, though most hormone levels were normal.
- All patients showed abnormal semen analyses, including low sperm concentration, reduced motility, and/or morphological defects.
Conclusions:
- The cell proliferation defect in CHH affects spermatogenic cells.
- This impairment in spermatogenesis is a significant finding in adult males with CHH.
Background:
Cartilage-hair hypoplasia (CHH), an autosomal recessive chondrodysplasia, is characterized by severe growth failure, hypoplastic hair, impaired immunity, and deficient erythropoiesis. These features may result from a generalized defect in cell proliferation.
Aim:
In order to investigate whether an impairment of cell proliferation is present in spermatogenesis, we analysed fertility in a clinical and laboratory study of adult males with CHH.
Methods:
Eleven adult males (median age 29 years, range 21-49 years) with CHH were included in the study. The patients were examined clinically for testicular volume and other clinical characteristics. Blood samples were collected to determine serum concentrations of sex hormones, sex hormone-binding globulin, inhibin B and gonadotrophins (basal and gonadotrophin-releasing hormone-stimulated). Semen samples were analysed for volume, sperm concentration, motility, morphology, and antibody status.
Results:
The testicular size was subnormal in some patients, but the serum concentrations of testosterone, inhibin B and gonadotrophins were usually normal. The semen analyses were not within normal limits in any of the patients, as indicated by low sperm concentration, decreased motility and/or morphological changes.
Conclusions:
The defect in cell proliferation in men with CHH also involves the spermatogenic cells and is evident as an impairment of spermatogenesis.