Human endogenous retroviruses make up 8 percent of the human genome. Researchers are studying how active they are
The following essay is reprinted with permission from The Conversation, an online publication covering the latest research.
Like modern HIV, these ancient retroviruses had to insert their genetic material into their host’s genome to replicate. Usually this kind of viral genetic material isn’t passed down from generation to generation. But some ancient retroviruses gained the ability to infect germ cells, such as egg or sperm, that do pass their DNA down to future generations.
To answer this question, our lab decided to focus on one group of HERVs known as HML-2. This group is the most recently active of the HERVs, having gone extinct less than 5 million years ago. Even now, some of its proviruses within the human genome still retain the ability to make viral proteins. Whether the genetic remnants of human endogenous retroviruses can cause disease in people is still under study. Researchers have spotted viruslike particles from HML-2 in cancer cells, and the presence of HERV genetic material in diseased tissue has been associated with conditions such as Lou Gehrig’s disease, or amyotrophic lateral sclerosis, as well as multiple sclerosis and even schizophrenia.
On the other hand, our research also suggests that HERVs could even be beneficial to people. The most famous HERV embedded in human and animal genomes, syncytin, is a gene derived from an ancient retrovirus that plays an important role in the formation of the placenta. Pregnancy in all mammals is dependent on the virus-derived protein coded in this gene.
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