Recombinant SINEs are formed at high frequency during induced retrotransposition in vivo

Vijay Pal Yadav, Prabhat Kumar Mandal, Alok Bhattacharya and Sudha Bhattacharya ()
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Vijay Pal Yadav: School of Environmental Sciences, Jawaharlal Nehru University
Prabhat Kumar Mandal: School of Life Sciences, Jawaharlal Nehru University
Alok Bhattacharya: School of Life Sciences, Jawaharlal Nehru University
Sudha Bhattacharya: School of Environmental Sciences, Jawaharlal Nehru University

Nature Communications, 2012, vol. 3, issue 1, 1-9

Abstract: Abstract Non-long terminal repeat Retrotransposons are referred to as long interspersed nuclear elements (LINEs) and their non-autonomous partners are short interspersed nuclear elements (SINEs). It is believed that an active SINE copy, upon retrotransposition, generates near identical copies of itself, which subsequently accumulate mutations resulting in sequence polymorphism. Here we show that when a retrotransposition-competent cell line of the parasitic protist Entamoeba histolytica, transfected with a marked SINE copy, is induced to retrotranspose, >20% of the newly retrotransposed copies are neither identical to the marked SINE nor to the mobilized resident SINEs. Rather they are recombinants of resident SINEs and the marked SINE. They are a consequence of retrotransposition and not DNA recombination, as they are absent in cells not expressing the retrotransposition functions. This high-frequency recombination provides a new explanation for the existence of mosaic SINEs, which may impact on genetic analysis of SINE lineages, and measurement of phylogenetic distances.

Date: 2012
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DOI: 10.1038/ncomms1855

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