Effect of C-banded heterochromatin on centromere separation.
The present study is to determine the effects of centromeric heterochromatin on centromere separation. Amniotic cell cultures in which the centromeric heterochromatin of one chromosome was at least twice as large (qh+) as the heterochromatin (qh) in the homologous chromosome were selected. Fifteen amniotic cell samples with 1qh+, 9qh+ or 16qh+ were studied. The size of the centromeric heterochromatin was directly correlated with the delay in centromere separation. The chromosome with the smaller centromeric heterochromatin tended to show earlier centromere separation than the homologue with the larger heterochromatin. Our results suggest that the quantity of centromeric heterochromatin may influence the genetic control of centromere separation.
Zhang
A
A
Department of Pediatrics, Los Angeles County-University of Southern California Medical Center, Los Angeles.
Lin
M S
MS
Wilson
M G
MG
D000650:Amnion / Q000648:ultrastructure; D002478:Cells, Cultured; D002503:Centromere / Q000648:ultrastructure*; D002871:Chromosome Banding; D002875:Chromosomes / Q000648:ultrastructure*; D002877:Chromosomes, Human / Q000648:ultrastructure*; D002878:Chromosomes, Human, Pair 1 / Q000648:ultrastructure; D002885:Chromosomes, Human, Pair 16 / Q000648:ultrastructure; D002899:Chromosomes, Human, Pair 9 / Q000648:ultrastructure; D006570:Heterochromatin / Q000648:ultrastructure*; D006801:Humans
D006570:Heterochromatin