Abstract
Satellite DNA (satellite), presented by repeated tandem sequences, is a heterochromatin with dense nucleosome packaging. We searched for determining factors (among the context and conformational characteristics of DNA) that favored this packaging. We developed a statistics based on amount of DNA bending for determination of the type of preference of the nucleosome positioning in tandem repeats. A statistically significant difference of the bending profile in tandem repeats from a random model was detected. Using the Fourier transform, we clarified that at least 50% of monomers have a periodicity of DNA bending profile about 170 bp, which corresponds to the length of the DNA, wrapped around the nucleosome (when considering the two first harmonics in the DNA bending profile). We determined that, in plants, the scheme of nucleosome positioning in subtelomeric satellites significantly differs from the corresponding scheme in centromeric satellites.
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