Homogeneity in the structure of the medaka fish transposable element Tol2

AKIHIKO KOGA; HIROSHI HORI

doi:10.1017/S0016672398003620

Abstract

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The hAT family is a group of transposable elements of the terminal inverted repeat class, which includes Ac of maize, hobo of Drosophila and Tam3 of Antirrhinum (snapdragon). All the members of this family so far examined are known to comprise complete and defective copies, with a good correspondence to autonomous and non-autonomous elements, respectively. Internal deletion is the most common cause of defective copies. Tol2, a transposable element of the medaka fish Oryzias latipes, is a member of the hAT family. We examined, mainly by the genomic Southern blot analysis, variation in the structure of copies of this element, and revealed that there are few or no internally deleted copies. This situation is unusual in a member of the hAT family. Possible causes of this anomaly are discussed.

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Homogeneity in the structure of the medaka fish transposable element Tol2

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