Transposable elements ( Alu s, LTRs , LINEs , SINEs )

Transposable elements play a key role in the evolution of most genomes. Class 1 transposable elements, which include Alu elements, long terminal repeats (LTRs), long interspersed elements (LINEs), and short interspersed elements (SINEs), have risen to a high copy number in the genomes of primates and other mammals. In humans, an estimated 42 percent of the genome is composed of LINEs, SINEs, and L…