DNA from Ancient Viral Infections Helps Embryo Development
- A stretch of DNA in the mouse genome left by ancient viral infections is crucial for early development in the womb, new research shows.
- According to the study, published in December in the journal Science Advances, this viral DNA switches on genes that give cells in early-stage mouse embryos the potential to...
- Even though it's critically important in the womb, if Dux stays activated too long, it kills cells. The human version of Dux,called DUX4,causes a progressive muscle-wasting disorder when...
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A stretch of DNA in the mouse genome left by ancient viral infections is crucial for early development in the womb, new research shows.
According to the study, published in December in the journal Science Advances, this viral DNA switches on genes that give cells in early-stage mouse embryos the potential to become almost any cell type in the body. The viral DNA – known as MERVL – itself gets activated by a protein called the “Dux transcription factor,” which binds to the sequence and essentially kick-starts the embryo’s development.
The new study not only unravels the roles of MERVL and dux in the womb but also teases apart these harmful effects that can appear later in life. It’s an “important piece of work,” said Sherif Khodeer, a postdoctoral research fellow who focuses on stem cell and developmental biology at the university KU Leuven but was not involved in the study.
Ancient Viral DNA and Early Embryonic development
Table of Contents
Recent research suggests that ancient viral DNA plays a role in early embryonic development, particularly in regulating gene activity. This has been observed in mice, and scientists are investigating whether similar mechanisms occur in humans. The research focuses on repetitive elements derived from retroviruses.
Role of MERVL in Mouse Development
A study conducted at the Medical Research Council Laboratory of Medical Sciences (MRC LMS) revealed that MERVL (Murine Endogenous Retrovirus L), a type of ancient viral DNA present in the mouse genome, influences early embryonic development. Specifically, MERVL appears to control the activation of genes crucial for forming the body plan. MRC LMS Research details these findings.
DUX4 Activation and Muscle Cell Development
The activation of the DUX4 gene, linked to facioscapulohumeral muscular dystrophy (FSHD), is a key area of inquiry. While all cells in individuals with FSHD carry the genetic changes causing the disease, DUX4 is only activated in muscle cells. National Center for Biotechnology Information (NCBI) – DUX4 Gene provides detailed information on the DUX4 gene. Researchers, including Michelle Percharde, head of the chromatin and development group at the MRC LMS, are working to understand what triggers this selective activation.
Interestingly, MERVL is not present in the human genome. However, scientists hypothesize that other stretches of ancient viral DNA, remnants of past infections, may perform similar functions in human embryos. National Human Genome Research Institute – Endogenous Retroviruses explains the role and prevalence of these elements in the human genome. Researchers are attempting to identify these equivalent sequences and determine their impact on early development.
Ongoing Research and Future Directions
Further research will focus on comparing the function of mouse Dux and human DUX4, and on understanding precisely how these viral elements regulate nearby genes.Researchers also aim to determine when and how these viral sequences are deactivated during embryo development. according to Khodeer, answering these questions could clarify species-specific differences in early developmental regulation. As of January 12, 2026, there are no breaking news reports indicating notable changes to these research directions. Medical Research Council (MRC) continues to fund research in this area.
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