Chemicals and energy are needed to create DNA, so eliminating these free-riders, known technically as transposable elements, ought to make evolutionary sense.
Excluding families found in one of the 14 more distantly-related eukaryotes as well as transposable elements and retroviruses leaves 1,317 gene families that appear within the past 93 million years.
It is likely that whatever limited molecular diversity observed in HERV-W env is a consequence of HERV proliferation within the genome, perhaps as transposable elements but not likely as repeated super-infections; hence, the diversity observed herein was limited despite the multiplicity of genomic loci involved.
This observation, combined with recent findings on the composition of W chromosomes in B. mori, C. pomonella, and several pyralids [57], [60], [63], [64], suggests that the B. anynana W chromosome is probably gene-poor and rich in interspersed repetitive sequences, such as transposable elements, which are known to be abundant in B. anynana in general [65].
High sequence homogeneity is expected in repeats arising by copying, such as transposable elements and telomeres, and Smith et al. [13] suggested that the unexpectedly low frequency of singly-mismatched DUESs relative to the non-mismatched one could be due to a balance between mutation away from the latter and its restoration by preferential uptake.
These sequences were not identified as transposable elements by RepeatMasker.
Proteins in the SwissProt dataset annotated as transposable elements were removed prior to alignment.
Repetitive DNA sequences, also known as transposable elements (TE) are abundantly found in the genome.
Intergenic regions of bacterial chromosomes carry important functional units such as transposable elements [ 1].
Most of these CNV were classified mainly as transposable elements and subtelomeric regions.
These can involve genes [ 3- 6] as well as transposable elements [ 7- 9].
