Jumping genes discovery 'challenges current assumptions'

Jumping genes do most of their jumping, not during the development of sperm and egg cells, but during the development of the embryo itself. The research, published this month in Genes and Development, "challenges standard assumptions on the timing of when mobile DNA, so-called jumping genes, insert into the human genome," says senior author Haig H. Kazazian Jr., MD, Seymour Gray Professor of Molecular Medicine in Genetics at the University of Pennsylvania School of Medicine.

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