Dear Arturo, please look at: A. Provata, C. Nicolis, G. Nicolis, PRE, 89, 052105 (2014). In the abstract the authors write: "To probe locally the spatial structure of the chain, we study the exit distances from a specific symbol, the distribution of recurrence distances, and the Hurst exponent, all of which show power law tails and long-range characteristics. These results suggest that human DNA can be viewed as a nonequilibrium structure maintained in its state through interactions with a constantly changing environment." I think that this may be a proper answer to your question