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Genetics, Vol 120, 397-407, Copyright © 1988
INVESTIGATIONS |
Analysis of a Mutator Activity Necessary for Germline Transposition and Excision of Tc1 Transposable Elements in Caenorhabditis elegans
I. Mori, D. G. Moerman and R. H. Waterston
Department of Genetics, Washington University School of Medicine, St. Louis, Missouri 63110
The Tc1 transposable element family of the nematode Caenorhabditis elegans consists primarily of 1.6-kb size elements. This uniformity of size is in contrast to P in Drosophila and Ac/Ds in maize. Germline transposition and excision of Tc1 are detectable in the Bergerac (BO) strain, but not in the commonly used Bristol (N2) strain. A previous study suggested that multiple genetic components are responsible for the germline Tc1 activity of the BO strain. To analyze further this mutator activity, we derived hybrid strains between the BO strain and the N2 strain. One of the hybrid strains exhibits a single locus of mutator activity, designated mut-4, which maps to LGI. Two additional mutators, mut-5 II and mut-6 IV, arose spontaneously in mut-4 harboring strains. This spontaneous appearance of mutator activity at new sites suggests that the mutator itself transposes. The single mutator-harboring strains with low Tc1 copy number generated in this study should be useful in investigations of the molecular basis of mutator activity. As a first step toward this goal, we examined the Tc1 elements in these low copy number strains for elements consistently co-segregating with mutator activity. Three possible candidates were identified: none was larger than 1.6 kb.
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