Study of the effect of CAG polymorphism of the androgen receptor (AR) gene on spermatological parameters in Russian men

Полиморфизм CAG-повторов в экзоне 1 гена андрогенового рецептора (AR/HUMARA) ассоциирован с патозооспермией и нарушением мужской фертильности, однако его влияние на сперматогенез и показатели семенной жидкости недостаточно изучено. В статье представлены результаты исследования влияния количества CAG-повторов гена AR на показатели спермограммы у российских мужчин с бесплодием в браке, связанным с патозооспермией (n=451), и у мужчин с нормозооспермией - контрольная группа (n=131). Не выявлено зависимости концентрации и общего количества сперматозоидов в эякуляте, доли (%) прогрессивно подвижных (PR), морфологически нормальных и живых сперматозоидов от количества CAG-повторов гена андрогенового рецептора. У пациентов с тератозооспермией количество CAG-повторов статистически значимо выше, чем у мужчин без тератозооспермии (22,37±3,20 против 22,15±3,12; р=0,02). Polymorphism of CAG repeats in exon 1 of the androgen receptor gene (AR/HUMARA) is associated with pathozoospermia and male sub-/infertility, but its effect on spermatogenesis and seminal fluid parameters is under evaluated. The article presents the results of a study of CAG repeats in AR gene on semen parameters in Russian male patients from infertile couples with pathozoospermia (n = 451), and in normozoospermic men, a control group (n = 131). The analysis of the groups revealed no dependence of the concentration indices, the total amount and amount (%) of progressively motile («PR»), morphologically normal and live spermatozoa from the number of CAG repeats of the AR gene. Teratozoospermic patients have statistically significantly higher number of CAG repeats, than men without teratozoospermia (22.37 ± 3.20 versus 22.15 ± 3.12; p = 0.02).

Influence of Androgen Receptor Gene CAG and GGC Polymorphisms on Male Sexual Function: A Cross-Sectional Study

Background. No study has assessed the possible involvement of GGC androgen receptor (AR) polymorphism in sexual function. Our aim is to evaluate the association between CAG and GGC AR polymorphisms in this function.Methods. We retrospectively examined eighty-five outpatients. Clinical, biochemical, and genetic parameters were considered. Sexual assessment was performed using the International Index of Erectile Function (IIEF) which evaluates erectile function (EF), orgasmic function (OF), sexual desire (SD), intercourse satisfaction (IS), and overall satisfaction (OS).Results. In the whole sample, CAG repeats were inversely correlated with EF, OF, and total IIEF-15 score, whereas GGC tracts did not show any significant correlation with sexual function. CAG relationship with IIEF items retained significance only in the eugonadal but not in the hypogonadal cohort. On the other hand, GGC tracts were not found to be significantly correlated with IIEF variables in either eugonadal or hypogonadal subjects. In eugonadal subjects, logistic regression pointed out that a higher number of CAG triplets were associated with lower values of EF, OF, SD, OS, and total IIEF independently from other confounders.Conclusions. GGC polymorphism seems not to exert any influence on sexual function, whereas CAG polymorphism appears to affect sexual parameters only in eugonadal subjects.