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

TL;DR

This study used atomic force microscopy to analyze the topography of early metaphase human chromosomes, revealing a central ridge and symmetry patterns that suggest interchromatidal interactions before disjunction.

Contribution

It provides novel high-resolution topographic insights into early metaphase chromosome structure, highlighting the central ridge and symmetry as indicators of transitional chromosomal arrangements.

Findings

Heterochromatic regions show high transversal symmetry.

Euchromatic regions display multiple peaks in height measurements.

Central ridge indicates interchromatidal interactions.

Abstract

The topographic structure of Giemsa banded (G-banded) early metaphase human chromosomes adsorbed on glass was analyzed by atomic force microscope using amplitude modulation mode [AM-AFM]. Longitudinal height measurements for early metaphasic human chromosomes showed a central ridge that was further characterized by transversal height measurements. The heterochromatic regions displayed a high level of transversal symmetry, while the euchromatic ones presented several peaks across the transversal height measurements. We suggest that this central ridge and symmetry patterns point out a transitional arrangement of the early metaphase chromosome and support evidence for interchromatidal interactions prior to disjunction.