Furthermore, ChIP-Seq identifies exact locations of TFBSs only indirectly and cannot discriminate between closely spaced multiple sites within DNA segments of hundreds of base pairs [ 4].
Comparative analyses of Buchnera, the primary mutualist of aphids, suggest that ongoing genome reduction proceeds primarily as a gradual erosion of individual genes, rather than by punctuated losses of large DNA segments encoding multiple genes [ 11].
For example the ordered sequence of TRAV12-11-10-9 genes recurs 6 times in the UMD3.1 assembly (Additional file 1), suggesting that replication of DNA segments containing multiple TRAV/TRDV genes has led to the formation of 'homology units'.
As high-resolution whole genome sequences are not yet available for Malacostraca or Decapoda species, it is difficult to make any conclusion if multiple copies of peculiar large DNA segments (Mj024A04-sequence) found in kuruma shrimp are also present in other species.
We performed a multiple sequence alignment of the seven DNA segments of the LCB 1047 using the CLUSTALW program [ 25] with the default settings.
Such vectors permitted the multiple and stable implantation of long DNA segments in desired hosts, avoided the use of antibiotics, decreased the chances of horizontal gene transfer [39] and avoided the unpredictability of having the transgenes cloned in plasmids.
Two of the three projects relied on newly developed technologies capable of deep-coverage sequencing, in which DNA segments were read rapidly multiple times to ensure that the determined order of bases was accurate.
The NAs also cause an unusual reiteration of DNA segments, which results in multiple copies of limited portions of DNA and increases the possibility of recombination, crossover, gaps and breaks [54].
Multiple DNA sequence alignments were inspected and any ambiguously aligned segments were removed prior to phylogenetic analysis.
This dynamic genomic organization permits some single DNA segments in the germline to contribute to multiple, distinct somatic genes via alternative processing.
