Seminal fluid effects on uterine receptivity to embryo implantation: transcriptomic strategies to define molecular mechanisms
Hon Y. Chan
A * and Sarah A. Robertson A
A
Abstract
Embryo implantation requires both a developmentally competent embryo and a receptive uterus. Impaired uterine receptivity is a common constraint on implantation success and reproductive outcome. Ovarian steroid hormones oestrogen and progesterone play a central role in establishing uterine receptivity, but other factors also contribute. One additional regulating factor is male partner seminal fluid. However, the full physiological impacts of seminal fluid on uterine receptivity and the specific molecular pathways involved are not yet completely defined. New advances in RNA-sequencing technologies provide a powerful means to examine how uterine tissues and cells respond to seminal fluid contact. Findings utilising sequencing technology provide strong cellular and molecular evidence in humans and mice that seminal fluid contact around the time of ovulation drives immune and vascular changes with potential to affect endometrial receptivity in the peri-implantation phase. This approach has led to the discovery of novel mediators and regulatory factors subsequently shown to facilitate embryo implantation in genetic mouse models, enabling functional validation. Here, we summarise the evidence from recent microarray and RNA-sequencing findings that seminal fluid contact can directly and indirectly impact the transcriptional state of endometrial tissue during the implantation window in mice and also in humans. Progress in elucidating the female reproductive tract response to seminal fluid will improve understanding of male partner effects on endometrial receptivity, and the knowledge gained will have practical applications for achieving healthy pregnancy and offspring outcomes.
Keywords: embryo implantation, endometrium, immune system, pre-implantation, seminal fluid, seminal plasma, sperm, uterine receptivity, uterus, vascular system.
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