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CHROMOSOME REARRANGEMENTS IN CAENORHABDITIS ELEGANS
Robert K. Herman 1, Donna G. Albertson 1, and Sydney Brenner 1
1 Medical Research Council Laboratory of Molecular Biology,
Hills Road, Cambridge, CB2 2QH, England
A method for selecting unlinked duplications of a part of the X chromosome of C. elegans is described. Five such duplications have been identified. One of them, Dp(X;V) 1, is translocated to linkage group V, where it suppresses crossing over along the left half of linkage group V. Dp(X;V )1 homozygotes grow slowly and are sterile. The other four duplications are associated with chromosome fragments, as observed cytologically by fluorescence microscopy, and tend to be lost. Their frequency of loss is higher in strains homozygous for a mutation that promotes nondisjunction of X chromosomes. The recombination frequencies between two of these duplications and the X have been measured: the frequencies are at least 50 times less than for X–X recombination in the same region. The duplications may prove useful as balancers of recessive lethal mutations.
Submitted on September 22, 1975Revised on January 5, 1976
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