Ref ID : 3926
Stephen F. NG; Interdependence of Cell Cycle Events in Tetrahymena thermophila: Formation of Contractile Vacuole Pores and Fission Gap in Ciliary Meridians. J.Protozool. 26(4):583-586, 1979
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The formation of the contractile vacuole pore (CVP) in Tetrahymena thermophila, genotype mol(b)/mol(b) is temporally and spatially associated with the formation of the fission gap in the CVP meridian. New CVPs arise when fission gaps appear in CVP meridians, the new pores being found anterior to the gaps. When, however, CVP meridians are rotated 180 degrees, the fission gaps develop late. In more than 1/3 of the 180 degrees-rotated CVP meridians, the new CVPs are formed before the appearance of the fission gap. Evidently, the appearance of the gap is not a prerequisite for CVP formation. Nevertheless, mutants exist in which the absence of fission gap and CVP are correlated in some cases and in which the presence of supernumerary fission gap and CVP are correlated in other instances. It is suggested that the 2 developmental events, although not causally related to each other, may be controlled by a common morphogenetic signal. This commits a certain site (mid-body) along a ciliary meridian to develop the fission gap as well as the CVP; however, after this step of commitment, the appearance of the fission gap is delayed in 180 degrees-rotated CVP meridians.