• PMID: 16396937
• Gene Name: ESR1
• Condition: Male infertility
• Association: Although the (TA)n polymorphism failed to show a significant association with male infertility, a significant effect of this polymorphism on sperm count observed.
• Mutation: (TA)n repeat polymorphism
• Population size: 347
• Population details: 347 (infertile and normospermic men)
• Sex: Male
• Infertility type: Male infertility
• Other associated phenotypes: Male infertility

Estrogen receptor alpha promoter polymorphism: stronger estrogen action is coupled with lower sperm count

Guarducci E, Nuti F, Becherini L, Rotondi M, Balercia G, Forti G, Krausz C.

BACKGROUND: Although the importance of estrogens in male reproduction is indisputable, little attention has been paid to the role of estrogen receptor (ER) gene mutations in male infertility. Significant correlation between (TA)n repeat allelic variants and lumbar bone mineral density was previously observed in the promoter region of the ERalpha gene, indicating that allelic combinations with higher number of (TA)n repeats are functionally more active genetic variants. METHODS: We studied the (TA)n repeat polymorphism situated in the promoter region of the ERalpha gene in a large group of infertile and normospermic men (n = 347). RESULTS: Although the (TA)n polymorphism failed to show a significant association with male infertility, we found a significant effect of this polymorphism on sperm count. In the group of infertile men, the mean TA repeat number and sperm concentration (P = 0.022) and total sperm number (P = 0.043) were inversely correlated, showing an association between higher TA repeat number (genotype A) and lower sperm production. In line with this observation, normospermic subjects with genotype A had a significantly lower mean sperm concentration with respect to men bearing genotype B with shorter TA alleles (P < 0.05) and a lower total sperm count (P < 0.01). CONCLUSIONS: Our data indicate that specific allelic combinations of the ERalpha, which confer a stronger estrogen effect, may negatively influence human spermatogenesis. FAU - Guarducci, Elena AU - Guarducci E AD - Department of Clinical Physiopathology, Andrology Unit, University of Florence, Florence, Italy. FAU - Nuti, Francesca AU - Nuti F FAU - Becherini, Lucia AU - Becherini L FAU - Rotondi, Mario AU - Rotondi M FAU - Balercia, Giancarlo AU - Balercia G FAU - Forti, Gianni AU - Forti G