The relevance of the individual screening for genetic variants in predicting ovarian response

Objective To investigate if polymorphisms of some genes involved in folliculogenesis predict ovarian response. Methods This prospective randomized study includes 124 egg donors genotyped for six SNPs ESR1 (rs2234693), AMHR2 (rs2002555), GDF-9 (rs10491279 and rs254286), AMH (rs10407022) and LHCBR (rs229327) genes and four STRs in ESR1 rs3138774), SHBG (rs6761), CYP19A1 (rs60271534) and AR genes (CAG repeats in exon 1). All donors followed standard ovarian stimulation protocol using a daily dose of 225 UI. The genotypes obtained were compared with the ovarian stimulation outcome. Results Regarding the number of retrieved oocytes, we found statistical differences for the ESR1 SNP and STR (19.3 +/- 8.9 for TT vs 15.3 +/- 6.2 for CC/CT, P = 0.027; 19.1 +/- 8.3 for 17repeats, P = 0.020). Moreover, women carrying TT in the ESR1 at position c.-397T>C with ESR1 (TA)n=17 retrieved the highest number of oocytes (20.4 +/- 9.3) (P = 0.001). Concerning AMHR2, we observed an association with the length of stimulation (9.1 +/- 1.4 d for AA vs 9.7 +/- 1.3 d for AG/GG, P = 0.021) and gonadotropin received (2050 +/- 319 for AA vs 2188 +/- 299 for AG/GG, P = 0.017). No significant differences were observed for the other polymorphisms (P > 0.05). Conclusion The polymorphisms in ESR1 and AMHR2 genes showed a clear association with the number of retrieved oocytes and the stimulation data, respectively. Our results suggest that polymorphisms in the genes for key reproductive hormones receptors could be used to predict the ovarian response and to personalize the stimulation prior the treatment.