Abstract
Two mariner-like elements, Ramar1 and Ramar2, are described in the genome of Rhynchosciara americana, whose nucleotide consensus sequences were derived from multiple defective copies containing deletions, frame shifts and stop codons. Ramar1 contains several conserved amino acid blocks which were identified, including a specific D,D(34)D signature motif. Ramar2 is a defective mariner-like element, which contains a deletion overlapping in most of the internal region of the transposase ORF while its extremities remain intact. Predicted transposase sequences demonstrated that Ramar1 and Ramar2 phylogenetically present high identity to mariner-like elements of mauritiana subfamily. Southern blot analysis indicated that Ramar1 is widely represented in the genome of Rhynchosciara americana. In situ hybridizations showed Ramar1 localized in several chromosome regions, mainly in pericentromeric heterochromatin and their boundaries, while Ramar2 appeared as a single band in chromosome A.
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Acknowledgments
We thank the Dr. Paolo M.A. Zanotto and Juliana Velasco for the sequencing support and Roberto Cabado for preparing confocal images. We thank the FAPESP and CNPq by financial support and fellowship.
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Rezende-Teixeira, P., Siviero, F., Andrade, A. et al. Mariner-like elements in Rhynchosciara americana (Sciaridae) genome: molecular and cytological aspects. Genetica 133, 137–145 (2008). https://doi.org/10.1007/s10709-007-9193-y
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DOI: https://doi.org/10.1007/s10709-007-9193-y