Inhomogeneous DNA: conducting exons and insulating introns

Details Inhomogeneous DNA: conducting exons and insulating introns Inhomogeneous DNA: conducting exons and insulating introns

2009-11-16

arxiv.org/abs/0911.2953v1

Phys. Rev. B 80 (2009) 085420

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 6 figures

Scientific paper

Parts of DNA sequences known as exons and introns play very different role in coding and storage of genetic information. Here we show that their conducting properties are also very different. Taking into account long-range correlations among four basic nucleotides that form double-stranded DNA sequence, we calculate electron localization length for exon and intron regions. Analyzing different DNA molecules, we obtain that the exons have narrow bands of extended states, unlike the introns where all the states are well localized. The band of extended states is due to a specific form of the binary correlation function of the sequence of basic DNA nucleotides.

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