By A.A. Moscona and Alberto Monroy (Eds.)
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B) N, Noncompetent cells (cells that are not competent to switch mating types in their next cell division); C, competent cells (cells that are competent to switch mating types in their next cell division). Ifall experienced cells are competent to switch, the lineage on the left is obtained. If not all experienced cells are competent to switch (such as t h e N cell a t the four-cell stage), the lineage on the right is obtained. Whether all experienced cells are competent is not known. 10 IRA HERSKOWITZ tribution of DNA strands do not provide an explanation consistent with the switching pattern (Williamson and Fennell, 1981).
45,961-981. Rine, J. D. (1979). D. thesis, University of Oregon, Eugene, Orgeon. , Strathern, J. , Hicks, J . , and Herskowitz, I. (1979). Genetics 93, 877-901. , and Herskowitz, I. (1981a). Cold Spring Harbor Symp. Quant. Biol. 45, 951-960. , Sprague, G. , and Herskowitz, I. (1981b). Mol. Cell. Bwl. 1, 958-960. Sprague, G. , and Herskowitz, I. J. Mol. B w l . 153, 305-321. Sprague, G. , and Herskowitz, I. (1981). J. Mol. Biol. 153, 323-335. Sprague, G. , and Herskowitz, I. (1982). Cell, in press.
1982). One way for such a discrimination to occur would be for a product of the mating type locus, for example, a2 product, to prevent transposition of the cassette at H M L or to stimulate transposition of the cassette at H M R. Although the molecular bases for the switching pattern are not understood, several perturbations of the switching pattern and of the switching process have recently been observed. , 1981b): (1)The cassettes at M A T and H M L or H M R no longer behave properly in the cassette substitution processdften the cassette at M A T donates its information to H M L or H M R and thereby replaces the cassettes residing at these loci.