A supercoiled DNA produced during the condensation of chromosomes in the nuclei of eukaryotes. This chromosome shortening is achieved by folding the linear array of nucleosomes into a helical fiber with six nucleosomes per turn. The molecules of histone 1 aggregate into a helical polymer along the center of the solenoid and stabilize it. A top view of the solenoid is shown. See Chronology, 1976, Finch and Klug; chromatin fibers, histones.
Drawing of solenoid structure by R. S. King.
Subjects: Genetics and Genomics.