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  1. ..., Queensland 4072, Australia Corresponding authors: faulknergj@gmail.com, sandra.richardson@mater.uq.edu.auAbstractMice harbor ∼2800 intact copies of the retrotransposon Long Interspersed Element 1 (L1). The in vivo retrotransposition capacity of an L1 copy is defined by both its sequence integrity...
  2. ...retrotransposon subfamily activation in the early embryo, followed by repression in adult tissues. These data highlight endogenous macaque L1 retrotransposition potential, provide prototypical evidence of L1-mediated somatic mosaicism in a nonhuman primate, and allude to L1 mobility in the brain over the past 30...
  3. ...MEI is inverted relative to the 3′ portion). These 5′ inversions have been proposed to be caused by a mechanism termed “twin priming,” whereby the TPRT process is initiated simultaneously from both strands of DNA at the genomic integration site (Ostertag and Kazazian 2001). Another feature of these 5′ inverted L1...
  4. ...) with the sequence 5′-CACTTGATAGTTTT-3′ (Fig. 1A; Supplemental Table S1). The insertion is truncated at the 5′ end and also contains a 5′ inversion and a small internal deletion at the inversion junction that presumably were caused by twin priming (Ostertag and Kazazian 2001). PCR validation assays confirmed...
  5. ...by the exclusion from that study of elements with deletions >51 nts. In our study, two of the elements contained a dual inverted fragment, likely generated by two consecutive twin priming attempts (see Extra Nucleotide Formation). These are distinct from previously reported multiple inversions comprised...
  6. ....M. , Kazazian, H.H. , Jr. ( 2001 ) Twin priming: A proposed mechanism for the creation of inversions in L1 retrotransposition . Genome Res. 11 : 2059 – 2065 . ↵ Roth, D.B. , Porter, T.N. , Wilson, J.H. ( 1985 ) Mechanisms of nonhomologous recombination in mammalian cells . Mol. Cell. Biol. 5 : 2599 – 2607...
  7. ..., Kazazian HH Jr. 2001. Twin priming: A proposed mechanism for the creation of inversions in L1 retrotransposition. Genome Res 11: 2059–2065. Quinlan AR, Clark RA, Sokolova S, Leibowitz ML, Zhang Y, Hurles ME, Mell JC, Hall IM. 2010. Genome-wide mapping and assembly of structural variant breakpoints...
  8. ...after the human–chimpanzee divergence (Hedges et al. 2004). For the 52 L1 insertions, in addition to the signatures of canonical retrotransposition, other typical structures associatedwith L1 insertions were identified: 11 insertions are inverted in the middle, presumably via the ‘‘twin-priming...
  9. ...—or otherwise noteworthy—phenotypic variation. Some of the most highly publicized discoveries of this nature are the species-specific restriction of HIV infection in owl monkeys ( Sayah et al. 2004 ), the generation of merle coat patterns in dogs ( Clark et al. 2006 ), and the creation of new varieties...
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  10. ...that such structures are the consequence of a twin-priming mechanism by which 59-inverted elements are formed (Ostertag and Kazazian 2001). Clearly, members of transduction group 4 are a consequence of 39-transducing transcription of source element H10_1 and subsequent 59 truncation occurring during reverse...
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