Normal and defective mariner-like elements in Rhynchosciara species (Sciaridae, Diptera).
Genet Mol Res
; 9(2): 849-57, 2010 May 04.
Article
em En
| MEDLINE
| ID: mdl-20449818
ABSTRACT
Mariner-like elements are widely present in diverse organisms. These elements constitute a large fraction of the eukaryotic genome; they transpose by a "cut-and-paste" mechanism with their own transposase protein. We found two groups of mobile elements in the genus Rhynchosciara. PCR using primers designed from R. americana transposons (Ramar1 and Ramar2) were the starting point for this comparative study. Genomic DNA templates of four species R. hollaenderi, R. millerii, R. baschanti, and Rhynchosciara sp were used and genomic sequences were amplified, sequenced and the molecular structures of the elements characterized as being putative mariner-like elements. The first group included the putative full-length elements. The second group was composed of defective mariner elements that contain a deletion overlapping most of the internal region of the transposase open reading frame. They were named Rmar1 (type 1) and Rmar2 (type 2), respectively. Many conserved amino acid blocks were identified, as well as a specific D,D(34)D signature motif that was defective in some elements. Based on predicted transposase sequences, these elements encode truncated proteins and are phylogenetically very close to mariner-like elements of the mauritiana subfamily. The inverted terminal repeat sequences that flanked the mariner-like elements are responsible for their mobility. These inverted terminal repeat sequences were identified by inverse PCR.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Elementos de DNA Transponíveis
/
Transposases
/
Dípteros
/
Proteínas de Ligação a DNA
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article