Yeast-phase cell cycle of the polymorphic fungus Wangiella dermatitidis.

Abstract:

:The yeast-phase cell cycle of Wangiella dermatitidis was studied using flow microfluorimetry and the deoxyribonucleic acid (DNA) synthesis inhibitor hydroxyurea (HU). Exposure of exponential-phase yeastlike cells to 0.1 M HU for 3 to 6 h resulted in the arrest of the cells in DNA synthesis and produced a nearly homogeneous population of unbudded cells. Treatment of the yeast-phase cells with HU for 9 h or longer resulted in the accumulation of the cells predominantly as budded forms having either a single nucleus in the mother cell or a single nucleus arrested in the isthmus between the mother cell and the daughter bud. Exposure of unbudded stationary-phase cells to 0.1 M HU resulted in the accumulation of the cells in the same phenotypes. Analysis by flow microfluorimetry and cell counts of HU-inhibited mithramycin-stained cells indicated that the eventual progress of HU-inhibited cells from unbudded to the two budded forms was due to the limited continuation of the growth sequence of the cell cycle even in the absence of DNA synthesis, nuclear division, and in some cases nuclear migration. On the basis of these observations and the results of flow microfluorimetric analysis of exponential-phase cells, a map of the yeast-phase cell cycle was constructed. The cycle appears to consist of two independent sequences of events, a budding growth sequence and a DNA division sequence. The nuclear division cycle of yeast-phase cells growing exponentially with a 4.5-h generation time is composed of a G1 interval of 148 min, as S phase of 16 min, and a G2 plus M interval of 107 min.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Roberts RL,Szaniszlo PJ

doi

10.1128/JB.144.2.721-731.1980

subject

Has Abstract

pub_date

1980-11-01 00:00:00

pages

721-31

issue

2

eissn

0021-9193

issn

1098-5530

journal_volume

144

pub_type

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