[No authors listed]
mdf-1/MAD1 is a conserved spindle assembly checkpoint component that is essential for the survival of Caenorhabditis elegans. Previously, using a dog-1(gk10)/FANCJ mutator strain, we have isolated a suppressor of mdf-1(gk2) sterility. This suppressor, named such-4, was demonstrated to be a tandem duplication that contained 62 putative protein coding genes. We apply here the recently developed Mos1-mediated single-copy insertion (MosSCI) method to study this copy number variation (CNV) in C. elegans and show that such-4 is caused by the duplication of a single gene cyb-3, illustrating the power of MosSCI-mediated single-gene duplications for uncovering gene dosage genetic interactions. Importantly, we show here, for the first time, that doubling the CYB-3 (Cyclin B3) dosage suppresses sterility in the absence of the essential spindle assembly checkpoint component MDF-1 without causing a delay in the onset of anaphase.
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