title: An unusual transposon with long terminal inverted repeats in the sea urchin Strongylocentrotus purpuratus.
abstract: A 3-kilobase DNA segment characteristic of a transposable element was found within a histone H2B pseudogene in a higher eukaryote, the sea urchin Stronglyocentrotus purpuratus. The inserted segment (TU1) is flanked by 8-base pair (bp) direct repeats of the H2B sequence. TU1 has long terminal inverted repeats approximately 840 bp long with an outer domain of 15-bp tandem repeats and a non-repeating inner domain, and is a member of a heterogeneous family of transposable elements. TU1 differs from most previously characterized eukaryotic transposable elements with terminal direct repats, but resembles the foldback transposon family in Drosophila.
mesh_terms: D000818:Animals; D001483:Base Sequence; D004247:DNA / Q000235:genetics; D004251:DNA Transposable Elements; D005796:Genes; D006657:Histones / Q000235:genetics*; D009690:Nucleic Acid Conformation; D012091:Repetitive Sequences, Nucleic Acid; D012617:Sea Urchins / Q000235:genetics*
chemical_list: D004251:DNA Transposable Elements; D006657:Histones; D004247:DNA