Abstract
The human genome contains a large number of repetitive elements derived from transposable elements (TEs). In addition to active Alu and long interspersed element (LINE or L1) interspersed repeats, the human genome comprises a large number of ancient TEs. These include fossil germ-line insertions of DNA transposons, fossil short interspersed elements (SINEs), L2, and L3 LINEs. Processed pseudogenes and human endogenous retroviruses (HERVs) have amplified more recently in evolutionary history and some of them are still well preserved. Copies of some of the recently extinct TEs continue to contribute to genomic rearrangements by homologous recombination. In this chapter, we review ancient SINE and LINE repeats, processed pseudogenes, HERVs, and DNA transposons. We briefly introduce the genomic structure and replication strategy of these elements, their expression competence, and focus on the contribution of these repeats to human diseases. We also discuss some of the TE-derived genes and regulatory elements.
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