Distinguishing Functional DNA Words; A Method for Measuring Clustering Levels

Functional DNA sub-sequences and genome elements are spatially clustered through the genome just as keywords in literary texts. Therefore, some of the methods for ranking words in texts can also be used to compare different DNA sub-sequences. In analogy with the literary texts, here we claim that th...

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Bibliographic Details
Published in:Scientific reports 2017-01, Vol.7 (1), p.41543-41543, Article 41543
Main Authors: Moghaddasi, Hanieh, Khalifeh, Khosrow, Darooneh, Amir Hossein
Format: Article
Language:English
Subjects:
631/114/2164
639/766/747
Algorithms
Base Composition
Chromosome 18
Chromosomes
Cluster Analysis
Computational Biology - methods
Deoxyribonucleic acid
DNA
DNA - chemistry
DNA - genetics
DNA methylation
Exome
Genome
Genomes
Genomics - methods
Humanities and Social Sciences
multidisciplinary
Nucleotide sequence
Promoters
Science
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Summary:Functional DNA sub-sequences and genome elements are spatially clustered through the genome just as keywords in literary texts. Therefore, some of the methods for ranking words in texts can also be used to compare different DNA sub-sequences. In analogy with the literary texts, here we claim that the distribution of distances between the successive sub-sequences (words) is q -exponential which is the distribution function in non-extensive statistical mechanics. Thus the q -parameter can be used as a measure of words clustering levels. Here, we analyzed the distribution of distances between consecutive occurrences of 16 possible dinucleotides in human chromosomes to obtain their corresponding q -parameters. We found that CG as a biologically important two-letter word concerning its methylation, has the highest clustering level. This finding shows the predicting ability of the method in biology. We also proposed that chromosome 18 with the largest value of q -parameter for promoters of genes is more sensitive to dietary and lifestyle. We extended our study to compare the genome of some selected organisms and concluded that the clustering level of CGs increases in higher evolutionary organisms compared to lower ones.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep41543