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2017 ; 7
(ä): 46395
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Complex multifractal nature in Mycobacterium tuberculosis genome
#MMPMID28440326
Mandal S
; Roychowdhury T
; Chirom K
; Bhattacharya A
; Brojen Singh RK
Sci Rep
2017[Apr]; 7
(ä): 46395
PMID28440326
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The mutifractal and long range correlation (C(r)) properties of strings, such as
nucleotide sequence can be a useful parameter for identification of underlying
patterns and variations. In this study C(r) and multifractal singularity function
f(?) have been used to study variations in the genomes of a pathogenic bacteria
Mycobacterium tuberculosis. Genomic sequences of M. tuberculosis isolates
displayed significant variations in C(r) and f(?) reflecting inherent differences
in sequences among isolates. M. tuberculosis isolates can be categorised into
different subgroups based on sensitivity to drugs, these are DS (drug sensitive
isolates), MDR (multi-drug resistant isolates) and XDR (extremely drug resistant
isolates). C(r) follows significantly different scaling rules in different
subgroups of isolates, but all the isolates follow one parameter scaling law. The
richness in complexity of each subgroup can be quantified by the measures of
multifractal parameters displaying a pattern in which XDR isolates have highest
value and lowest for drug sensitive isolates. Therefore C(r) and multifractal
functions can be useful parameters for analysis of genomic sequences.