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The topographic structure of Giemsa banded (G-banded) early metaphase humanchromosomes adsorbed on glass was analyzed by atomic force microscope usingamplitude modulation mode [AM-AFM]. Longitudinal height measurements for earlymetaphasic human chromosomes showed a central ridge that was furthercharacterized by transversal height measurements. The heterochromatic regionsdisplayed a high level of transversal symmetry, while the euchromatic onespresented several peaks across the transversal height measurements. We suggestthat this central ridge and symmetry patterns point out a transitionalarrangement of the early metaphase chromosome and support evidence forinterchromatidal interactions prior to disjunction.

Interchromatidal central ridge and transversal symmetry in early metaphasic human chromosome one