28S junctions and chimeric elements of the rDNA targeting non-LTR retrotransposon R2 in crustacean living fossils (Branchiopoda, Notostraca)
نویسندگان
چکیده
منابع مشابه
Long-term inheritance of the 28S rDNA-specific retrotransposon R2.
R2 is a non-long-terminal-repeat (LTR) retrotransposon that inserts specifically into 28S rDNA. R2 has been identified in many species of arthropods and three species of chordates. R2 may be even more widely distributed in animals, and its origin may be traceable to early animal evolution. In this study, we identified R2 elements in medaka fish, White Cloud Mountain minnow, Reeves' turtle, hagf...
متن کاملAnalysis of the 5' junctions of R2 insertions with the 28S gene: implications for non-LTR retrotransposition.
R2 elements are non-long terminal repeat retrotransposable elements that insert into 28S rRNA genes of most insect species. The single open reading frame of R2 encodes a protein with both endonuclease activity, which cleaves the target site, and reverse transcriptase activity, which uses this cleavage to prime reverse transcription. This target-primed reverse transcription mechanism is also use...
متن کاملIdentification of rDNA-specific non-LTR retrotransposons in Cnidaria.
Ribosomal RNA genes are abundant repetitive sequences in most eukaryotes. Ribosomal DNA (rDNA) contains many insertions derived from mobile elements including non-long terminal repeat (non-LTR) retrotransposons. R2 is the well-characterized 28S rDNA-specific non-LTR retrotransposon family that is distributed over at least 4 bilaterian phyla. R2 is a large family sharing the same insertion speci...
متن کاملEndonuclease domain of the Drosophila melanogaster R2 non-LTR retrotransposon and related retroelements: a new model for transposition
The molecular mechanisms of the transposition of non-long terminal repeat (non-LTR) retrotransposons are not well understood; the key questions of how the 3'-ends of cDNA copies integrate and how site-specific integration occurs remain unresolved. Integration depends on properties of the endonuclease (EN) domain of retrotransposons. Using the EN domain of the Drosophila R2 retrotransposon as a ...
متن کاملHybridogenesis and a potential case of R2 non-LTR retrotransposon horizontal transmission in Bacillus stick insects (Insecta Phasmida)
Horizontal transfer (HT) is an event in which the genetic material is transferred from one species to another, even if distantly related, and it has been demonstrated as a possible essential part of the lifecycle of transposable elements (TEs). However, previous studies on the non-LTR R2 retrotransposon, a metazoan-wide distributed element, indicated its vertical transmission since the Radiata-...
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ژورنال
عنوان ژورنال: Genomics
سال: 2012
ISSN: 0888-7543
DOI: 10.1016/j.ygeno.2012.04.005