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Gonadal dysgenesis with x monosomy in a cynomolgus monkey macaca fascicularis

, : Gonadal dysgenesis with x monosomy in a cynomolgus monkey macaca fascicularis. American Journal of Primatology 22(1): 51-60

A 3-year-old female cynomolgus monkey (Macaca fascicularis) was found to have inappropriately high circulating immunoassayable follicle-stimulating hormone (FSH) and luteinizing hormone (LH) levels compatible with primary gonadal failure. Hypergonadotropic hypogonadism was confirmed by the findings of persistently high serum gonadotropin levels by both LH bioassay and FSH and LH radioimmunoassays and low levels of serum estradiol. In addition, circhoral gonadotropin pulsatility and an exaggerated response to a gonadotropin-releasing hormone challenge were demonstrated. Both FSH and LH coeluted in a single peak on gel filtration column chromatography. Clinically, the animal showed the following features of Turner syndrome: small body size, sexual underdevelopment, gonadal streaks with absent follicles, and a chromosomal constitution of 41,X. A similar case has been reported previously in a rhesus monkey (Macacca mulatta). Considering the fetal and live birth prevalences in humans of aneuploidy in general and X-monosomy in particular, one would predict that this chromosomal aberration underlies a high number of pregnancy failures in nonhuman primates.


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