Transduction of 3'-flanking sequences is common in L1 retrotransposition - PubMed (original) (raw)
Comparative Study
doi: 10.1093/hmg/9.4.653.
Affiliations
- PMID: 10699189
- DOI: 10.1093/hmg/9.4.653
Comparative Study
Transduction of 3'-flanking sequences is common in L1 retrotransposition
J L Goodier et al. Hum Mol Genet. 2000.
Abstract
Active LINE-1 (L1) elements possess the ability to transduce non-L1 DNA flanking their 3' ends to new genomic locations. Occasionally, the 3' end processing machinery may bypass the L1 polyadenylation signal and instead utilize a second downstream polyadenylation site. To determine the frequency of L1-mediated transduction in the human genome, we selected 66 previously uncharacterized L1 sequences from the GenBank database. Fifteen (23%) of these L1s had transposed flanking DNA with an average transduction length of 207 nucleotides. Since there are approximately 400 000 L1 elements, we estimate that insertion of transduced sequences alone may have enlarged the diploid human genome as much as 19 Mb or 0.6%. We also examined 24 full-length mouse L1s and found two long transduced sequences. Thus, L1 retrotransposition in vivo commonly transduces sequence flanking the 3' end of the element.
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