Genomic islands or pathogenicity islands (PAI) are chromosomal or episomal regions in pathogenic bacteria, associated with (i) virulence associated genes (VAGs),(ii) varying G+C contents compared with the host chromosome, (iii) flanking mobility and insertion elements, such as IS elements, integrases, transposases, direct repeats, and (iv) tRNA genes [52], [53], [54].
For instance, SIGI-HMM [ 38] identifies regions of codon usage dissimilar from comparator species and IslandPath-DIMOB [ 39] examines query sequence for the presence of flanking repeats, mobility genes, nearby tRNAs, and atypical dinucleotide sequence to identify genomic regions that were potentially acquired by horizontal transfer.
Large genomic islands which are flanked by mobility elements are known as large mobile elements (LMEs), and include prophages or phage-like elements (pLEs) [ 54].
She has also developed more elaborate implementations, including a modified qTOF containing two SID cells flanking Waters' ion mobility separation unit, for performing multiple surface collision events.
IS elements, which can contribute to gene mobility, flank the toxin gene clusters within the BoNT/A1 and BoNT/A3 strains, and are found downstream of the clusters in the BoNT/B strains.
This discrepancy could be due to the nature of the gel matrix, or to slightly biased flanking sequences or differences in mobility patterns of specific repeat units as previously mentioned by other investigators [ 12, 13].
Again for all T4SS regions flanking repeats are found suggesting mobility, and protein identity values and GC-content values of the tra- trb genes are higher than the genomic average (38%), supporting again horizontal and not vertical transmission.
In addition, insertions usually were located adjacent to tRNA genes, flanking direct repeats or insertion sequence (IS) elements, or mobility genes such as integrases or transposases.
Moreover, the regions flanking RGP76 also contained CDSs potentially involved in gene mobility, that is, ORFs similar to the typical plasmid replicon genes parA, parB, parD, parE, mobB, mobC, repB, korC, and klcA.
The sex gene is a member of the high mobility genes (HMG) family and is located between two flanking genes that code for a triose-phosphate transporter homolog (TPT) and an RNA helicase [16].
Furthermore, basic residues flanking the zinc binding region on either side have been demonstrated, by Electrophoretic Mobility Shift Assay (EMSA) experiments, to be essential for Ros DNA binding.
