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Updated: Mar 26, 2026
05:22
Ex vivo Culture of Human Placental Explants for the Study of Viral Transmission Across the Maternal-Fetal Interface
Published on: December 30, 2025
337
Viruses and the placenta: the essential virus first view.
1Center for Virus Research, Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA.
Summary
A novel virus-first hypothesis suggests endogenous retroviruses (ERVs) were crucial for mammalian placenta evolution. These ERVs directly influenced virus-host persistence, a key factor in host survival.
Area of Science:
- Evolutionary biology
- Virology
- Reproductive biology
Background:
- The origin of the mammalian placenta remains a complex evolutionary question.
- Endogenous retroviruses (ERVs) are remnants of ancient viral infections integrated into host genomes.
- Their role in mammalian evolution, particularly placentation, is increasingly recognized.
Purpose of the Study:
- To propose an alternative hypothesis for the origin of the mammalian placenta.
- To explore the role of endogenous retroviruses (ERVs) from a virus-first perspective.
- To investigate the link between virus-host persistence and placental evolution.
Main Methods:
- Hypothesis-driven theoretical framework.
- Review of existing literature on ERVs and mammalian evolution.
- Comparative genomics analysis (implied).
Main Results:
- Presents a virus-first perspective as an alternative to traditional hypotheses.
- Highlights virus-host persistence as a critical determinant of host survival.
- Suggests specific ERVs have directly impacted virus-host persistence dynamics.
Conclusions:
- Endogenous retroviruses may have played a direct, causative role in the evolution of the mammalian placenta.
- Virus-host persistence is a fundamental evolutionary force shaping mammalian reproduction.
- This perspective offers new avenues for research into retroviral-host interactions and evolutionary innovations.
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