From link:
https://letterstocreationists.wordpress.com/2015/11/
"The genetic signature of a retrovirus in the genome is very distinctive. ERVs have common features such as the genes that code for the viral coat protein and for the reverse transcriptase that copies the viral RNA genome into DNA. The ERV DNA codes for three groups of proteins, known as “
gag” (matrix, capsid, nucleoproteins), “
pol“ (protease, reverse transcriptase, RNaseH, dUTPase, integrase) and “
env” (subunit and transmembrane). This genetic core is flanked by long terminal repeats (LTR) sections. Finally, when the retrovirus tears open the host genome for insertion, some of the torn original host DNA is recopied on either side of the viral insert.
Here is what all this looks like for the insertion of a particular retrovirus from the CERV 30 family into the chimpanzee genome:
Insertion of a member of the CERV 30 (HERVK10) family in chimps. The insertion occurred in the LINE element present in chromosome 10 of the chimpanzee genome. The orthologous LINE element is present in chromosome 12 in humans. In chimpanzees target site duplications (ATTAT) are identified. A single copy of TSD (ATTAT, the pre-integration site) is found inside the LINE element in humans. The LTRs of the element are 99.4% identical.
Source: Nalini Polavarapu, Nathan J Bowen, and John F McDonald, Identification, characterization and comparative genomics of chimpanzee endogenous retroviruses, Genome Biol. 2006; 7(6): R51"
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1779541/