RRC ID 3355
著者 Kojima KK, Fujiwara H.
タイトル An extraordinary retrotransposon family encoding dual endonucleases.
ジャーナル Genome Res
Abstract Retrotransposons commonly encode a reverse transcriptase (RT), but other functional domains are variable. The acquisition of new domains is the dominant evolutionary force that brings structural variety to retrotransposons. Non-long-terminal-repeat (non-LTR) retrotransposons are classified into two groups by their structure. Early branched non-LTR retrotransposons encode a restriction-like endonuclease (RLE), and recently branched non-LTR retrotransposons encode an apurinic/apyrimidinic endonuclease-like endonuclease (APE). In this study, we report a novel non-LTR retrotransposon family Dualen, identified from the Chlamydomonas reinhardtii genome. Dualen encodes two endonucleases, RLE and APE, with RT, ribonuclease H, and cysteine protease. Phylogenetic analyses of the RT domains revealed that Dualen is positioned at the midpoint between the early-branched and the recently branched groups. In the APE tree, Dualen was branched earlier than the I group and the Jockey group. The ribonuclease H domains among the Dualen family and other non-LTR retrotransposons are monophyletic. Phylogenies of three domains revealed the monophyly of the Dualen family members. The domain structure and the phylogeny of each domain imply that Dualen is a retrotransposon conserving the domain structure just after the acquisition of APE. From these observations, we discuss the evolution of domain structure of non-LTR retrotransposons.
巻・号 15(8)
ページ 1106-17
公開日 2005-8-1
DOI 10.1101/gr.3271405
PII 15/8/1106
PMID 16077010
PMC PMC1182223
MeSH Amino Acid Sequence Animals Catalytic Domain Chlamydomonas reinhardtii / genetics Conserved Sequence Cysteine Endopeptidases / chemistry Endonucleases / chemistry Endonucleases / genetics Endonucleases / metabolism* Evolution, Molecular Molecular Sequence Data Multigene Family Phylogeny Protein Structure, Tertiary RNA Splicing RNA, Antisense / genetics Retroelements / genetics* Ribonuclease H / genetics Ribonuclease H / metabolism
IF 11.093
引用数 21
WOS 分野 BIOTECHNOLOGY & APPLIED MICROBIOLOGY GENETICS & HEREDITY BIOCHEMISTRY & MOLECULAR BIOLOGY
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