C-banding of Peromyscus constitutive heterochromatin persists following histone hyperacetylation.

Abstract:

:Approx. 35% of the DNA of cultured cells from the cactus mouse, Peromuscus eremicus, is contained in highly condensed constitutive heterochromatin which can be visualized in metaphase chromosomes stained by the C-band technique. Previous studies have shown this constitutive heterochromatin to contain a large proportion of underacetylated, arginine-rich histones, the majority of which can be hyperacetylated when cells are treated with butyrate. In order to determine whether this simulation of the acetylated state of euchromatin alters the cytological properties of constitutive heterochromatin as well, chromosomes from butyrate-treated cells have been examined. Because of the paucity of cells in butyrate-treated cultures, prematurely condensed chromosomes (PCCs) were produced from butyrate-treated cells by fusion with mitotic cells. In these PCCs, both the highly condensed nature and the ability to C-band were preserved in the hyperacetylated constitutive heterochromatin, suggesting that the subset of arginine-rich histones which is refractory to acetylation in the presence of butyrate may be responsible for the maintenance of the heterochromatic state. In addition, PCC analyses indicated that butyrate arrests Peromyscus cells in both the G1 and G2 phases of the cell cycle and confirmed the late-replicating pattern of constitutive heterochromatin.

journal_name

Exp Cell Res

authors

Halleck MS,Schlegel RA

doi

10.1016/0014-4827(83)90209-4

subject

Has Abstract

pub_date

1983-09-01 00:00:00

pages

269-79

issue

2

eissn

0014-4827

issn

1090-2422

journal_volume

147

pub_type

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