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Genetics, Vol 145, 173-183, Copyright © 1997
INVESTIGATIONS |
The Mutation masculinizer (man) Defines a Sex-Determining Gene With Maternal and Zygotic Functions in Musca domestica L
R. Schmidt, M. Hediger, R. Nothiger and A. Dubendorfer
Institute of Zoology, University of Zurich, 8057 Zurich, Switzerland
In Musca domestica, the primary signal for sex determination is the dominant factor M, which is assumed to regulate a postulated female-determining gene F. Presence of M prevents expression of F so that male development ensues. In the absence of M, F can become active, which dictates the female pathway. The existence of F is inferred from F(D), a dominant factor that is epistatic to M. We describe a new mutation masculinizer, which has all the properties expected for a null or strongly hypomorphic allele of F: (1) it maps to the same chromosomal location as F(D), (2) homozygous man/man animals develop as males, (3) homozygous man/man clones generated in man/+ female larvae differentiate male structures, (4) man has a sex-determining maternal effect. About a third of the morphological males synthesize yolk proteins, which indicates that they are intersexual in internal structures. The maternal effect of man is complete in offspring that derive from homozygous man/man pole cells transplanted into female hosts. In this case, all man/+ progeny become fertile males that do not produce yolk proteins. A sex-determining maternal effect has previously been demonstrated for F(D). Like F, maternal man(+) is needed for zygotic man(+) to become active, providing further evidence that man is a loss-of-function allele of F.
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