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Updated: Apr 2, 2026

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Human receptive endometrial assembloid for deciphering the implantation window.

Yu Zhang1,2,3,4, Rusong Zhao2,3,4,5, Chaoyan Yang2,3

  • 1Department of Obstetrics and Gynecology, Qilu Hospital of Shandong University, Jinan, China.

Elife
|April 1, 2026
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Summary

A new human endometrial assembloid model successfully mimics the receptive uterus, offering a powerful tool to study early pregnancy and related conditions. This breakthrough aids research into endometrial receptivity and maternal-fetal interactions.

Keywords:
assembloidcell biologyendometriumhumanimplantation window

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Area of Science:

  • Reproductive Biology
  • Developmental Biology
  • Cell Biology

Background:

  • Human endometrial receptivity is crucial for successful pregnancy.
  • In vivo studies are ethically restricted, necessitating advanced models.
  • Endometrial assembloids offer a promising in vitro approach.

Purpose of the Study:

  • To establish a human window-of-implantation (WOI) endometrial assembloid.
  • To mimic the in vivo receptive endometrium for research.
  • To investigate endometrial receptivity mechanisms.

Main Methods:

  • Development of a specialized human WOI endometrial assembloid system.
  • Characterization of structural and molecular features.
  • Assessment of hormone responsiveness and functional attributes.

Main Results:

  • The WOI assembloid replicated key features like pinopodes and cilia.
  • It demonstrated mid-secretory endometrium molecular characteristics.
  • The model showed hormone responsiveness, enhanced mitochondria, ciliary function, and EMT, with embryo implantation potential.

Conclusions:

  • WOI endometrial assembloids provide a robust model for studying endometrial receptivity.
  • This system facilitates research into maternal-fetal interactions and pathologies.
  • It holds potential for advancing reproductive medicine and understanding implantation.