Objective: To analyze the transcriptomic profile of endometrial gene alterations during the window of implantation in infertile obese patients.
Design: Multicenter, prospective, case-control study.
Setting: Three academic medical centers for reproductive medicine.
Patient(s): Infertile patients, stratified into body mass index (BMI) categories according to the World Health Organization guidelines, were included in the study.
Intervention(s): Endometrial samples were obtained from women undergoing standardized estrogen and P replacement cycles after 5 days of vaginal P supplementation.
Main outcome measure(s): To identify endometrial gene expression alterations that occur during the window of implantation in infertile obese patients as compared with infertile normal-weight controls using a microarray analysis.
Result(s): XCL1, XCL2, HMHA1, S100A1, KLRC1, COTL1, COL16A1, KRT7, and MFAP5 are significantly dysregulated during the window of implantation in the receptive endometrium of obese patients. COL16A1, COTL1, HMHA1, KRCL1, XCL1, and XCL2 were down-regulated and KRT7, MFAP5, and S100A1 were up-regulated in the endometrium of obese patients. These genes are mainly involved in chemokine, cytokine, and immune system activity and in the structural extracellular matrix and protein-binding molecular functions.
Conclusion(s): Obesity is associated with significant endometrial transcriptomic differences as compared with non-obese subjects. Altered endometrial gene expression in obese patients may contribute to the lower implantation rates and increased miscarriage rates seen in obese infertile patients.
Clinical trial registration number: NCT02205866.
Keywords: Endometrial gene expression; endometrial receptivity; infertility; metabolic syndrome; obesity.
Copyright © 2016 American Society for Reproductive Medicine. Published by Elsevier Inc. All rights reserved.