Abstract
The human genome is under constant invasion by retrotransposable elements. The most successful of these are the Alu elements; with a copy number of over a million, they occupy about 10 % of the entire genome. Interestingly, the vast majority of these Alu insertions are located in gene-rich regions, and one-third of all human genes contains an Alu insertion. Alu sequences are often embedded in gene sequence encoding pre-mRNAs and mature mRNAs, usually as part of their intron or UTRs. Once transcribed, they can regulate gene expression as well as increase the number of RNA isoforms expressed in a tissue or a species. They also regulate the function of other RNAs, like microRNAs, circular RNAs, and potentially long non-coding RNAs. Mechanistically, Alu elements exert their effects by influencing diverse processes, such as RNA editing, exonization, and RNA processing. In so doing, they have undoubtedly had a profound effect on human evolution.
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We would like to thank Joshua Rosenthal, Lars Wieslander, and Petra Björk for their input and for critically reading the paper. This work was supported by the Swedish Research Council, grant K2013-66X-20702-06-4.
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Daniel, C., Behm, M. & Öhman, M. The role of Alu elements in the cis-regulation of RNA processing. Cell. Mol. Life Sci. 72, 4063–4076 (2015). https://doi.org/10.1007/s00018-015-1990-3
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DOI: https://doi.org/10.1007/s00018-015-1990-3