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Issue:ISSN 1000-7083
          CN 51-1193/Q
Director:Sichuan Association for Science and Technology
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Analysis of repetitive sequences in Periplaneta americanana genome
Author of the article:MOU Biqin, YAN Chaochao, LI Wujiao, YUE Bisong
Author's Workplace:College of Life and Sciences, Sichuan University
Key Words:Periplaneta americana; genome; repetitive sequences;transposable elements; BovB retrotransposons; phylogenetic
Abstract:Repetitive sequences constitute a large fraction of a eukaryote genome. Some types of repetitive sequences, such as LINEs, a member of autonomous transposons, have been widely applied in molecular phylogenetic and genetic diversity studies of insects. Approaches of both de novo prediction and homology alignment were used to search the Periplaneta americana genome for repeatitive sequences, which were then proved to account for approximately 62% of the genome. In interspersed repetitive sequences, the DNA transposons constituted 16.18% of the whole genome. In retrotransposons, LINEs accounted for 13.64% of the genome while those were 3.52% and 1.32% for SINE and LTR retrotransposons respectively. The BovB superfamily in LINEs was the most abundant (6.73%) comparing to other types of transposons in the P. americana genome. All types of transposable element in P. americana were more in coverage than that of Blattella germanics except the LTR retrotransposons. According to the integrality of the reverse transcriptase from retrotransposons, similarities and genetic distance of the amino acid sequences within BovBs regions, BovB retrotransposons in P. americana genome were identified and named RTE-1_Pam. The phylogentic relationships based on the amino acid sequences of BovB reverse transcriptase indicates that the relationships of P. americana and Zootermopsis nevadensis share closer relationships than that of P. americana and B. germanica who both from Blattidae. The difference of relationships among these insects between result from BovB retrotransposons based phylogenetic inference and conclusion of the traditional taxonomy suggests that the TEs were somehow heterogeneous relative to the whole genome and are more or less independence.
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