Editing Retroposon (section)

== Difference between retroposons and retrotransposons ==
In contrast to [[retrotransposon]]s, retroposons never encode [[reverse transcriptase]] (RT) (but see below). Therefore, they are non-autonomous elements with regard to [[transposition (genetics)|transposition]] activity (as opposed to [[transposon]]s).
Non-long terminal repeat (LTR) retrotransposons such as the human [[LINE1]] elements are sometimes falsely referred to as retroposons. However, this depends on the author. For example, [[Howard Temin]] published the following definition: Retroposons encode RT but are devoid of [[long terminal repeat]]s (LTRs), for example [[Long interspersed nuclear element|long interspersed elements]] (LINEs). Retrotransposons also feature LTRs and [[retroviruses]], in addition, are packaged as viral particles (virions). Retrosequences are non-autonomous elements devoid of RT. They are retroposed with the aid of the machinery of autonomous elements, such as LINEs; examples are [[short interspersed nuclear element]]s (SINEs) or mRNA-derived [[Pseudogene#Processed|retro(pseudo)genes]].<ref name=Temin1989>{{cite journal |author=Temin HM |title=Retrons in bacteria |journal=Nature |volume=339 |issue=6222 |pages=254–5 |date=1989 |pmid=2471077 |doi=10.1038/339254a0|bibcode=1989Natur.339..254T |s2cid=29368479 |doi-access=free }}</ref><ref name="Makałowski_2007">{{cite book | vauthors = Makałowski W, Toda Y | chapter = Modulation of Host Genes by Mammalian Transposable Elements |veditors = Volff JN, Schmid M |title=Gene and Protein Evolution |publisher=S. Karger |location=Basel |isbn= 978-3-8055-8341-1 |edition=3rd | series = Genome Dynamics | oclc = 729848415 | page = 166 | doi = 10.1159/000107610 | date = 2007 | volume = 3 | pmid = 18753791 }}</ref><ref name="Makałowski_2019">{{cite book | vauthors = Makałowski W, Gotea V, Pande A, Makałowska I | chapter = Transposable Elements: Classification, Identification, and Their Use as a Tool for Comparative Genomics | title = Evolutionary Genomics | veditors = Anisimova M | series = Methods in Molecular Biology | location = Clifton, NJ | volume = 1910 | pages = 185–86 | date = 2019 | pmid = 31278665 | doi = 10.1007/978-1-4939-9074-0_6 | isbn = 978-3-8055-8341-1 | oclc = 145014779 | doi-access = free }}</ref>