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Karakatsanis, L.P.; Pavlos, G.P.; Iliopoulos, A.C.; Pavlos, E.G.; Clark, P.M.; Duke, J.L.; Monos, D.S.
Physica A, 09/2018, Letnik: 505Journal Article
This study combines two independent domains of science, the high throughput DNA sequencing capabilities of Genomics and complexity theory from Physics, to assess the information encoded by the different genomic segments of exonic, intronic and intergenic regions of the Major Histocompatibility Complex (MHC) and identify possible interactive relationships. The dynamic and non-extensive statistical characteristics of two well characterized MHC sequences from the homozygous cell lines, PGF and COX, in addition to two other genomic regions of comparable size, used as controls, have been studied using the reconstructed phase space theorem and the non-extensive statistical theory of Tsallis. The results reveal similar non-linear dynamical behavior as far as complexity and self-organization features. In particular, the low-dimensional deterministic nonlinear chaotic and non-extensive statistical character of the DNA sequences was verified with strong multifractal characteristics and long-range correlations. The nonlinear indices repeatedly verified that MHC sequences, whether exonic, intronic or intergenic include varying levels of information and reveal an interaction of the genes with intergenic regions, whereby the lower the number of genes in a region, the less the complexity and information content of the intergenic region. Finally we showed the significance of the intergenic region in the production of the DNA dynamics. The findings reveal interesting content information in all three genomic elements and interactive relationships of the genes with the intergenic regions. The results most likely are relevant to the whole genome and not only to the MHC. These findings are consistent with the ENCODE project, which has now established that the non-coding regions of the genome remain to be of relevance, as they are functionally important and play a significant role in the regulation of expression of genes and coordination of the many biological processes of the cell. •The estimation of Tsallis q-triplet were found to deviate from unity in both cases indicating non-Gaussian Boltzmann–Gibbs statistics.•Our results indicate the usability of Tsallis theory for the discrimination of DNA regions.•We find that the information of the number of genes/exonic regions is interacting with the information level of the intergenic regions.•MHC sequences, whether exonic, intronic or intergenic include varying levels of information. These regions most likely interact with each other.•We showed the Long-range correlations and the memory character of the DNA sequence.
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