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Fig. 6. Interspecific comparisons of zygotic cell cycle checkpoints.
(A) Summary model suggested by the data in
Fig. 5. Regulatory processes
are represented by magenta circles and broken magenta arrows (see text for
details). (B) The present study suggests that regulation of zygotic
development in F. serratus is accomplished by a system of checkpoints
that lie intermediate between those of the tightly coupled budding yeast (C)
and the loosely coupled Drosophila embryo (D). Zygotic polarization
and cell cycle progression in F. serratus are coordinated by
Ca2+ dependent processes, but there is no dependence of the cell
cycle on polarization. (C) In budding yeast, cell cycle progression and
polarization are made interdependent by the G1/S checkpoint and the
morphogenesis checkpoint. (D) In Drosophila embryos, cell
cycle progression and zygotic polarization are independent, run in parallel
and may be uncoupled from each other by inhibitor treatments.
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