Smidlee
Veteran
ERVs insert pretty much randomly. They don't have to be anywhere particularly advantageous, just somewhere where they (if they were functional retroviral RNA) would be used by the cell to generate new virons. The surrounding DNA is, by and large, not that relevant to their purpose. Sometimes, when they mutate to not produce new virons and become ERVs, they might be advantageous to the host cell. Out of the many that have occurred in the history of life on Earth, there are almost definitely going to be a few that serve that purpose. Other than those few, though, they're mostly just non-coding strands of nucleic acid that get passed on randomly because they aren't harmful.
Richard Sternberg recently gave a speech about this subject on the junk DNA myth as in last few years it has been revealed how important on where the so called "junk DNA" are located. The more we learn the more we find purpose in all areas of the living cell including "junk DNA".
It's very hard to accept this since it another nail in the evolution coffin. Instead of finding design in nature is an illusion we are finding "junk DNA" is an illusion.
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