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- W2048134890 abstract "Abstract Nuclear differentiation is responsible for mating type determination in many ciliates. In Tetrahymena pyriformis, syngen 1, the focus of differentiation is the macronuclear subunit. We have analyzed mating type distribution within caryonides of these strains, in order to derive some insight into nuclear events. Cell lineages were established for the first two macronuclear divisions following conjugation. The resulting secondary subcaryonides were expanded 30-fold, and each subline was tested for mating type. Two kinds of caryonides were observed: monotypic caryonides yielded sublines all of the same mating type; polytypic caryonides produced sublines of different mating types. Most polytypic caryonides were ditypes, with one mating type (the majority type) in excess over the other (the minority type). No evidence was found for any systematic relationship between the mating types in a ditypic caryonide, except that mating type II appears primarily as a monotype. Thus, the mating type combinations and some aspects of the quantitative patterns involve indeterminate or random nuclear events. The nuclear events are not entirely random, however. Coordination among subunits being differentiated is indicated by the large numbers of monotypic caryonides, the rarity of high polytypes and the eccentricity of outputs in ditypes. The output ratios suggest that the most likely time for subunit differentiation is the 32-unit stage. The distribution of mating types among sublines indicates that subunit assortment is nonrandom for the first two macronuclear divisions. Finally, reexamination of an aberrant pair which might have indicated an exception to early macronuclear differentiation provides no unequivocal evidence for an exception to the rule of caryonidal inheritance in this syngen of T. pyriformis." @default.
- W2048134890 created "2016-06-24" @default.
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- W2048134890 date "1968-09-01" @default.
- W2048134890 modified "2023-09-27" @default.
- W2048134890 title "Clonal analysis of nuclear differentiation in Tetrahymena" @default.
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- W2048134890 doi "https://doi.org/10.1016/0012-1606(68)90033-x" @default.
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