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Ovarian differentiation in Turner's syndrome
Journal De Genetique Humaine
|March 1, 1978
Summary
This study examines gonadal development in Turner syndrome (45,X) patients, revealing ovarian dysgenesis. Findings suggest an inability of oogonia to complete meiosis contributes to this condition.
Area of Science:
- Reproductive Biology
- Human Genetics
- Developmental Biology
Background:
- Turner syndrome (45,X) is associated with gonadal abnormalities.
- Understanding gonadal histogenesis in Turner syndrome is crucial for reproductive health.
Purpose of the Study:
- To investigate gonadal histogenesis and the impact of sexual chromosome complements on ovarian development in Turner syndrome.
- To identify specific sexual differentiation structures and their presence in relation to varying karyotypes.
Main Methods:
- Histological examination of gonads from 17 patients with diverse 45,X mosaic and non-mosaic karyotypes.
- Assessment of structures including coelomic epithelium, stroma, follicles, sexual cords, medullary tubules, rete ovarii, hilar cells, and mesonephric remnants.
Main Results:
- All studied gonads exhibited rudimentary ovarian stroma with varying degrees of hyalinization.
- Primordial follicles were observed in two patients (45,X/46,XX and 45,X/46,XXqi/47,XXqiXqi), and a cystic follicle in one (45,X/46,XXp--).
- Sexual cords were present in 6 patients, medullary tubules in 9, and varying amounts of hilar cells were detected.
Conclusions:
- Turner syndrome is characterized by ovarian dysgenesis, likely due to premature involution.
- The genetic inability of oogonia to complete meiotic prophase is implicated as a cause of ovarian immaturity.