AI Article Synopsis
- The implantation of embryos into the uterus is a key process in mammalian reproduction, linked to the development of live births and placentation.
- This review highlights the different signals that recognize pregnancy and the various ways implantation occurs in eutherian mammals, emphasizing evolutionary diversity.
- While we have learned a lot about these processes, especially in rodents and bats, more research is needed on understudied species to better understand how implantation modes and pregnancy signaling have evolved.
Article Abstract
The implantation of the embryo into the maternal endometrium is a complex process associated with the evolution of viviparity and placentation in mammals. In this review, we provide an overview of maternal recognition of pregnancy signals and implantation modes in eutherians, focusing on their diverse mechanisms and evolutionary patterns. Different pregnancy recognition signals and implantation modes have evolved in eutherian mammals, reflecting the remarkable diversity of specializations in mammals following the evolution of viviparity. Superficial implantation is the ancestral implantation mode in Eutheria and its major clades. The other modes, secondary, partially, and primary interstitial implantation have each independently evolved multiple times in the evolutionary history of eutherians. Although significant progress has been made in understanding pregnancy recognition signals and implantation modes, there is still much to uncover. Rodents and chiropterans (especially Phyllostomidae) offer valuable opportunities for studying the transitions among implantation modes, but data is still scarce for these diverse orders. Further research should focus on unstudied taxa so we can establish robust patterns of evolutionary changes in pregnancy recognition signaling and implantation modes.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11274353 | PMC |
| http://dx.doi.org/10.3390/ani14142077 | DOI Listing |
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