Abstract
Genetic material has been traditionally envisioned as relatively static with the exception of occasional, often deleterious mutations. The sequence DNA-to-RNA-to-protein represented for many years the central dogma relating gene structure and function. Recently, the field of molecular genetics has provided revolutionary information on the dynamic role of repetitive elements in the function of the genetic material and the evolution of humans and other organisms. Alu sequences represent the largest family of short interspersed repetitive elements (SINEs) in humans, being present in an excess of 500,000 copies per haploid genome. Alu elements, as well as the other repetitive elements, were once considered to be useless. Today, the biology of Alu transposable elements is being widely examined in order to determine the molecular basis of a growing number of identified diseases and to provide new directions in genome mapping and biomedical research. 66 refs., 5 figs.
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