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GENETIC CONTROL OF PHOSPHATE-METABOLIZING ENZYMES IN NEUROSPORA CRASSA: RELATIONSHIPS AMONG REGULATORY MUTATIONS
Barbara S. Littlewood 1, William Chia 1, and Robert L. Metzenberg 1
1 Department of Physiological Chemistry, University of Wisconsin, Madison, Wisconsin 53706
In Neurospora crassa, the phosphate-metabolizing enzymes are made during phosphate starvation, but not under phosphate sufficiency. The synthesis of these enzymes is controlled by three regulatory genes: pcon-nuc-2, preg and nuc-1. pcon-nuc-2 and preg are closely linked. A model of the hierarchical relationships among these regulatory genes is presented. Studies of double mutants and revertants confirm several predictions of the model. It has been found that nuc-2 (null) and pconc (constitutive) mutations reside in the same cistron. pregc (constitutive) mutations are epistatic to nuc-2 mutations. nuc-1 (null) mutations are epistatic to all others.
Submitted on September 12, 1974
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