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Deficit in oxygen causes G(2) budding and unbudded G(2) arrest in Cryptococcus neoformans
M Ohkusu1, V Raclavsky, K Takeo
1Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8673, Japan.
Abstract:
Cryptococcus neoformans exhibited diphasic growth when grown under limited aeration. First, it grew exponentially, but at OD 1, the concentration of dissolved oxygen in culture decreased to 1 mg l(-1) and a second phase of slow growth was started. This phase was characterized by a shift of budding from S to G(2), a sharp decrease in budding index and a sharp increase in the proportion of unbudded G(2) cells to 80%. Thus, a deficit in oxygen was demonstrated to delay the timing of budding, prolong the G(2) phase and cause accumulation of cells after DNA synthesis, but before commitment to budding.