title: [Structural polymorphism of the heterochromatin region of human Y chromosome].
abstract: A comparison of sequential stained Y-chromosomes from 13 individuals has shown that Q- and C-blocks are not identical. Several polymorphic variants of positively stained regions were revealed. These data suggest the existence of no less than 4 types of structures in the heterochromatic region of Y-chromosome, that vary independently and reflect the localization of different satellite DNA sequences: 1) this region is positively stained using both Q- and C-methods; 2) the proximal Q-negative block, positively stained by C-method; 3) the distal Q-negative block, positively stained by C-method; 4) the distal Q-positive block not revealed by C-method. For the complete revealing of heterochromatic constitution of human Y-chromosome both Q- and C-methods are needed.
mesh_terms: D006570:Heterochromatin / Q000648:ultrastructure*; D006801:Humans; D007621:Karyotyping; D008297:Male; D011110:Polymorphism, Genetic; D012730:Sex Chromosomes / Q000648:ultrastructure*; D013194:Staining and Labeling / Q000379:methods; D014998:Y Chromosome / Q000648:ultrastructure*
chemical_list: D006570:Heterochromatin
vernacular_title: Polimorfizm struktury geterokhromatinovogo raĭona Y-khromosomy cheloveka.