Pituitary response to GnRH stimulation tests in different FSHB-211 G/T genotypes

• Published in: Human reproduction (Oxford) 2021-04, Vol.36 (5), p.1376-1382
• Main Authors: Sansone, Andrea, Schubert, Maria, Tüttelmann, Frank, Krallmann, Claudia, Zitzmann, Michael, Kliesch, Sabine, Gromoll, Jörg
• Format: Article
• Language: English
• ISSN: 0268-1161; 1460-2350
• DOI: 10.1093/humrep/deab033

Does pituitary response to a GnRH stimulation test differ according to the different FSHB-211 G/T genotypes? The promoter polymorphism FSHB-211 G > T affects the pituitary response to exogenous GnRH stimulation by reducing FSH and increasing LH outputs. The FSHB-211 G > T single nucleotide polymorphism (SNP) is known to affect pituitary FSH output by impairing the transcriptional activity of FSHB. This was a cross-sectional, retrospective study on 67 male subjects (mean age: 24.6 ± 10.3 years) undergoing a GnRH stimulation test for diagnostic purposes in cases of secondary hypogonadism. A GnRH stimulation test was performed by administering an i.v. bolus of 100 µg of the GnRH-analogue gonadorelin acetate to all patients, with blood samples drawn from the cubital vein immediately prior to injection (T0) and 30 (T1) and 45 minutes (T2) after. Clinical and genetic data were retrieved from a computerized database. Linear longitudinal mixed-effect models were used to assess the effects of SNP genotype on FSH and LH levels over time via additive and recessive models. An overall marked increase in serum FSH and LH following administration i.v. of 100 µg of an LHRH-analogue was found (P T polymorphism might result in an impaired response to endogenous, as well as exogenous, GnRH stimulation. This finding might contribute to the clinical phenotype of reduced testicular volume and sperm count for patients carrying one or two T alleles. Parts of the study were supported by the German Research Foundation (CRU326 Male Germ Cells). On behalf of all authors, the corresponding author states that there is no con