Exact(3)
Finally, the distance between these recent TE insertions and genes showed that most of the recently inserted copies of LTR elements were located close to genes (Table 3).
Our results showed that the recently inserted Alu elements are heavily methylated, with an average methylation level of 90.7%; this is similar to the average methylation level observed for evolutionarily young non-polymorphic Alu elements [ 31, 32].
When the match threshold was relaxed to 80% to find the number of copies that may have been related to the recently inserted copy, 19 elements had more than one related copy (ranging from 2 to 17 copies); from these, 18 were again Copia elements and one (with six copies) was an undetermined LTR element.
Similar(57)
The 3' flanking sequences from these recently inserted CR1 were evaluated for GC content.
The Ji-5 and Fasu from the r1 region, the Prem-1 and Ji in the c1 region, and the Yemi in the tb1 region (all from maize) are the most recently inserted LTR retrotransposons.
These criteria are likely to identify the most recently inserted and potentially active member of the family.
It is worth noting that the most recently inserted L1s in O. palustris and S. hispidus are subject to very different evolutionary forces.
The lone, recently inserted Gypsy element had no related ESTs.
Based on LTR divergence, the most recently inserted families are from Class II.
Together, our sequence-based data and PCR-based confirmation of the absence of SPIN elements in the python (Feschotte C, unpublished data), in contrast to the abundance of recently inserted SPIN elements in the copperhead, provide compelling new evidence that, as with mammalian genomes (Pace et al. 2008; Gilbert et al. 2010), reptilian genomes have been differentially invaded by these elements.
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