Endogenous Retroviruses (ERVs) have been described as occurring in surprisingly large numbers in the human genome (up to 8%).
I have read reviews describing the proliferation of these once-RNA sequences as relating to their relative inactivity allowing them to survive the germ cell proliferation without being detected and eradicated during the endogenous ‘proof-reading' phase.
Is it possible that retroviral RNA sequences are still being integrated into human genomes as part of the explanation behind the extent of ERV section, so that some of these ERVs stem from contemporary integration of RNA, rather than ancient sources?