Editing Gene duplication (section)

===Retrotransposition===
[[Retrotransposon]]s, mainly [[LINE1|L1]], can occasionally act on cellular mRNA. Transcripts are reverse transcribed to DNA and inserted into random place in the genome, creating retrogenes.  Resulting sequence usually lack introns and often contain poly(A) sequences that are also integrated into the genome. Many retrogenes display changes in gene regulation in comparison to their parental gene sequences, which sometimes results in novel functions. Retrogenes can move between different chromosomes to shape chromosomal evolution.<ref>{{Cite journal |last1=Miller |first1=Duncan |last2=Chen |first2=Jianhai |last3=Liang |first3=Jiangtao |last4=Betrán |first4=Esther |last5=Long |first5=Manyuan |last6=Sharakhov |first6=Igor V. |date=2022-05-28 |title=Retrogene Duplication and Expression Patterns Shaped by the Evolution of Sex Chromosomes in Malaria Mosquitoes |journal=Genes |volume=13 |issue=6 |pages=968 |doi=10.3390/genes13060968 |issn=2073-4425 |pmc=9222922 |pmid=35741730 |doi-access=free }}</ref>