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Genetics, Vol. 168, 1307-1322, November 2004, Copyright © 2004
doi:10.1534/genetics.104.031724
Genetic Analysis of the Caenorhabditis elegans pax-6 Locus
Roles of Paired Domain-Containing and Nonpaired Domain-Containing Isoforms
Hediye Nese Cinar and Andrew D. Chisholm1
Sinsheimer Laboratories, Department of Molecular, Cellular and Developmental Biology, University of California, Santa Cruz, California 95064
1 Corresponding author: 351 Sinsheimer Laboratories, Department of Molecular, Cellular and Developmental Biology, University of California, Santa Cruz, CA 95064.
E-mail: chisholm{at}biology.ucsc.edu
PAX-6 proteins are involved in eye and brain development in many animals. In the nematode Caenorhabditis elegans the pax-6 locus encodes multiple PAX-6 isoforms both with and without a paired domain. Mutations in the C. elegans pax-6 locus can be grouped into three classes. Mutations that affect paired domain-containing isoforms cause defects in epidermal morphogenesis, epidermal cell fates, and gonad cell migration and define the class I (vab-3) complementation group. The class II mutation mab-18(bx23) affects nonpaired domain-containing isoforms and transforms the fate of a sensory organ in the male tail. Class III mutations affect both paired domain and nonpaired domain isoforms; the most severe class III mutations are candidate null mutations in pax-6. Class III mutant phenotypes do not resemble a simple sum of class I and class II phenotypes. A comparison of class I and class III phenotypes indicates that PAX-6 isoforms can interact additively, synergistically, or antagonistically, depending on the cellular context.
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