Genetics, Vol 146, 1049-1060, Copyright © 1997


INVESTIGATIONS

The Mouse Clock Mutation Behaves as an Antimorph and Maps Within the W(19H) Deletion, Distal of Kit

D. P. King, M. H. Vitaterna, A. M. Chang, W. F. Dove, L. H. Pinto, F. W. Turek and J. S. Takahashi
National Science Foundation Center for Biological Timing, and Department of Neurobiology and Physiology, Northwestern University, Evanston, Illinois 60208-3520

Clock is a semidominant mutation identified from an N-ethyl-N-nitrosourea mutagenesis screen in mice. Mice carrying the Clock mutation exhibit abnormalities of circadian behavior, including lengthening of endogenous period and loss of rhythmicity. To identify the gene affected by this mutation, we have generated a high-resolution genetic map (>1800 meioses) of the Clock locus. We report that Clock is 0.7 cM distal of Kit on mouse chromosome 5. Mapping shows that Clock lies within the W(19H) deletion. Complementation analysis of different Clock and W(19H) compound genotypes indicates that the Clock mutation behaves as an antimorph. This antimorphic behavior of Clock strongly argues that Clock defines a gene centrally involved in the mammalian circadian system.


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