title: Large-scale periodicity of nucleosome positioning signal in pericentric regions of chromosomes (Drosophila melanogaster).
abstract: Nucleosome positioning signal (NPS) in heterochromatin is not uniform. We suggest the analysis of its heterogeneity by correlation with periodic function (analog of Furrier analysis). It was established the periodical repetition of the nucleosome clusters of large size in pericentric regions in a discontinuous manner. In the 3L pericentric region, it was revealed the domination of 78-85 kbp wavelength in the correlation coefficient profile and also strong presentation of 50 kbp signal. In further to centromere position, the 69 kbp value strongly dominates as well as the 50 kbp value in the closest proximity. In addition to the long wavelength signals, there are plenty of short wavelengths signals especially in the closest vicinity to centromere. In some positions throughout pericentric region of 2L chromosome, there are two sizes of repeated intermingled correlation signals (50, and 75 kbp) with dominating value of 75 kbp in proximity and 50 kbp distantly to centromere, the situation for 2R is analogous. Some genes with long introns support these quantitative characteristics of NPSs and to some extent their dominating character in each region. The characteristic repeat periods for 3L pericentric region coincide with the distances between heterochromatin epigenetic mark clusters and their distribution throughout this region for fly embryos, larvae, and some cell lines.
authors.affiliation: a Institute of Molecular Genetics , Kurchatov Sq.2, Moscow 123182 , Russian Federation .
authors.forename: V B
authors.initials: VB
authors.lastname: Fedoseyeva
authors.forename: A A
authors.initials: AA
authors.lastname: Alexandrov
mesh_terms: D000818:Animals; D002503:Centromere / Q000378:metabolism; D002868:Chromosomal Proteins, Non-Histone / Q000378:metabolism; D059006:Chromosomes, Insect / Q000378:metabolism* / Q000648:ultrastructure; D029721:Drosophila Proteins / Q000378:metabolism; D004331:Drosophila melanogaster / Q000378:metabolism* / Q000648:ultrastructure; D044127:Epigenesis, Genetic; D005819:Genetic Markers; D007438:Introns; D009707:Nucleosomes / Q000378:metabolism* / Q000648:ultrastructure; D059372:Nucleotide Motifs
chemical_list: D002868:Chromosomal Proteins, Non-Histone; D029721:Drosophila Proteins; D005819:Genetic Markers; D009707:Nucleosomes; C452193:heterochromatin protein 1, Drosophila
keywords: heterochromatin; nucleosome positioning; peri-centromere