Viruses helped create the placenta?

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In summary, the blog post discusses the concept of endogenous retroviruses and their role in the evolution of host genes. The post specifically focuses on the idea that these viruses have contributed to the development of important structures in mammals, such as the placenta. This theory is not new, as it has also been proposed for the origin of other organelles in organisms.
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At http://science-matters.blogspot.com/2006/05/endogenous-retroviruses-are-we-product.html , part of a carnival of animacules being celebrated, is an article on endoviruses. These are the descendents of retroviruses that inserted their code into the DNA, which have subsequently settled down as tru host genes.

And not just junk DNA either, as the article asserts that the mammalian placenta, among other structures, is built out of mutated versions of proteins from three separate endovirus genes!
 
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organelles

yes the same theories have existed for years in the production of organism's organelles. mitochondria and chloroplasts both contain ring DNa that is constistant with such an endo virus, yet exist in every single organism on the planet:confused:
 
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It is fascinating to think that viruses, often seen as harmful and destructive, may have played a crucial role in the evolution of complex organisms such as mammals. The idea that viruses have inserted their genetic code into the DNA of their host and have become an integral part of their biology is truly remarkable.

The fact that endoviruses have been found to contribute to the development of the placenta is particularly intriguing. The placenta is a vital organ in pregnancy, responsible for providing nutrients and oxygen to the developing fetus. The fact that it is built out of mutated versions of proteins from endoviruses highlights the important role these viruses may have played in the development of mammals.

This discovery also raises questions about the origins of the placenta and how it evolved. It is possible that without the contribution of endoviruses, the placenta as we know it may not have existed. This shows the complex and interconnected nature of evolution, where seemingly unrelated events can have a profound impact on the development of new traits and structures.

Overall, this article sheds light on the often overlooked positive effects of viruses in the natural world. While they can certainly be harmful, it is important to remember that they have also played a significant role in shaping the diversity of life on our planet.
 

1. How did viruses help create the placenta?

Scientists believe that viral DNA became incorporated into the DNA of our ancient ancestors, which led to the evolution of the placenta. This viral DNA provided the genetic material necessary for the development of the placenta and helped it become a critical feature in mammalian reproduction.

2. Did viruses play a role in the evolution of the placenta?

Yes, recent studies have shown that viruses played a significant role in the evolution of the placenta. Viral DNA has been found in the genomes of all placental mammals, indicating that it played a crucial role in the development of this reproductive organ.

3. How do scientists know that viruses helped create the placenta?

Scientists have found elements of viral DNA in the genomes of placental mammals, which suggests that these viruses played a role in the development of the placenta. Additionally, studies using animal models have shown that viral genes can influence the development of the placenta.

4. Did viruses have a positive or negative impact on the evolution of the placenta?

While viruses are typically seen as harmful, their role in the evolution of the placenta was likely beneficial. The incorporation of viral DNA into the genomes of our ancient ancestors provided the genetic material necessary for the development of the placenta, which is a critical reproductive organ for mammals.

5. Are viruses still playing a role in the development of the placenta?

No, the incorporation of viral DNA into the genomes of our ancestors happened millions of years ago. However, viruses continue to shape our evolution in other ways, such as through genetic mutations and natural selection.

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