The Tol2 transposable element of the medaka fish: An active DNA-based element naturally occurring in a vertebrate genome.

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Abstract
Several DNA-based transposable elements are known to be present in vertebrate genomes, but few of them have been demonstrated to be active. The Tol2 element of the medaka fish is one such element and, therefore, is potentially useful for developing a gene tagging system and other molecular biological tools applicable to vertebrates. Towards this goal, analyses of the element at the molecular, cellular and population levels are in progress. Results so far obtained are described here.