Abstract
We describe here Tdr2, a new class of Tc1-like transposons in zebrafish. Tdr2 was identified from the genomic sequence of a zebrafish PAC (P1 artificial chromosome) clone, and fragments of Tdr2 were found in several zebrafish EST (expressed sequence tag) sequences. Predicted translation of the Tdr2 transposase gene showed that it was most closely related to Caenorhabditis elegans Tc3A, suggesting an ancient origin of the Tdr2 transposon. Tdr2 spans 1. 1kb and is flanked by inverted repeats of approx. 100bp. The 5' repeat is itself composed of an inverted repeat, raising the possibility of the formation of a cruciform DNA structure. Tdr2 transposons may facilitate the development of novel transposon-based tools for the genetic analysis of zebrafish.
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