Abstract
Nuclear reorganization, which results in the differentiation between macronuclear anlagen and micronuclei during autogamy or conjugation in Paramecium tetraurelia, was compared in wild-type cells and in two mutants, mic44 and kin241, which form abnormal numbers of macronuclear anlagen and micronuclei. Our observations show that all macronuclear anlagen derive from the nuclei positioned at the posterior pole of the cell at the second postzygotic division. This posterior localization is transient and correlated with a marked change in cell shape and decrease of cell length. These results suggest that cytoplasmic or cortical factors precisely located in the posterior pole are essential to trigger macronuclear differentiation and that the control of nuclear positioning is dependent upon precise modifications of cell shape.
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