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Genetics, Vol 136, 119-127, Copyright © 1994
INVESTIGATIONS |
Meiotic Mutants That Cause a Polar Decrease in Recombination on the X Chromosome in Caenorhabditis elegans
S. A. Broverman and P. M. Meneely
Current address: Department of Biochemistry and Cell Biology, State University of New York at Stony Brook, Stony Brook, New York 11794.
Recessive mutations in three autosomal genes, him-1, him-5 and him-8, cause high levels of X chromosome nondisjunction in hermaphrodites of Caenorhabditis elegans, with no comparable effect on autosomal disjunction. Each of the mutants has reduced levels of X chromosome recombination, correlating with the increase in nondisjunction. However, normal or elevated levels of recombination occur at the end of the X chromosome hypothesized to contain the pairing region (the left end), with recombination levels decreasing in regions approaching the right end. Thus, both the number and the distribution of X chromosome exchange events are altered in these mutants. As a result, the genetic map of the X chromosome in the him mutants exhibits a clustering of genes due to reduced recombination, a feature characteristic of the genetic map of the autosomes in non-mutant animals. We hypothesize that these him genes are needed for some processive event that initiates near the left end of the X chromosome.
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