Abstract
To report the clinical, hormonal, and molecular features of a female adolescent with selective FSH deficiency. In addition, a complete review of previous cases is provided, focusing on hormonal aspects. Clinical study. University hospital. A 16-year-old girl with primary amenorrhea and poor breast development due to isolated FSH deficiency. Blood drawing before and after GnRH stimulation and pelvic ultrasound examination. Gonadotropin and E(2) measurements and sequencing of the FSH beta-subunit gene. The patient was referred for primary amenorrhea and partial breast development (Tanner III). Her basal and GnRH-stimulated LH levels were elevated (31 IU/L and 98 IU/L, respectively), whereas her FSH levels were undetectable (<1 IU/L) in both conditions. Estradiol levels were low (<13 pg/mL). Automatic sequencing showed a nucleotide substitution of C for A in exon 3, resulting in a homozygous nonsense mutation in amino acid position 76 (Tyr76X) of the FSH beta-subunit. The Tyr76X mutation of the FSH beta-subunit was associated with a partial phenotype of FSH deficiency. To date, only four loss-of-function mutations of the FSH beta-subunit have been described in eight patients with undetectable serum FSH and high serum LH levels. Therefore, this unusual hormonal profile strongly suggests a defect in the FSH beta-subunit in both sexes.
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