Characterisation of transposable elements containing internal tandem repeats in the pacific oyster Crassostrea gigas (Thunberg, 1793)

Vojvoda Zeljko, Tanja (2015) Characterisation of transposable elements containing internal tandem repeats in the pacific oyster Crassostrea gigas (Thunberg, 1793). Doctoral thesis, Faculty of Science > Department of Biology.

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Abstract

Tandem and interspersed repetitive DNA sequences make up a large part of eukaryotic genomes, being present also in bivalve molluscs (class Bivalvia). Recently sequenced genome of Crassostrea gigas shows high abundance of repetitive sequences (36 %). In this work, using bioinformatic approach, 10 most abundant types of tandemly repeated sequences were found. Taking into account monomer lengths typical for satellite DNA and the ability of forming long arrays, these tandem repetas are potentially new satellite DNAs. On the other hand, they are quite special in being inserted into transposons. In fact, a detailed analysis of their flanking regions showed that they bear structural characteristics typical for non – autonomous mobile genetic elements of the Helitron superfamily. The presence of such elements was investigated in the related species Ostrea edulis. A close connection between Helitrons and tandem repeats has been identified and two models for satellite spreading from transposable elements are discussed. The results presented here show that mobile genetic elements and tandem repeats together contribute to a complex and dynamic organization of eukaryotic genomes.

Item Type: Thesis (Doctoral thesis)
Keywords: Crassostrea gigas, tandem repeats, satellite DNA, transposable elements, Helitron
Supervisor: Plohl, Miroslav
Date: 2015
Number of Pages: 134
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Silvana Šehić
Date Deposited: 06 Jul 2015 10:02
Last Modified: 06 Jul 2015 10:02
URI: http://digre.pmf.unizg.hr/id/eprint/4093

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