Genetics, Vol 120, 159-171, Copyright © 1988


INVESTIGATIONS

Genetic Evidence That the sans fille Locus Is Involved in Drosophila Sex Determination

B. Oliver, N. Perrimon and A. P. Mahowald
Department of Genetics, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106

Females homozygous for sans fille(1621) (= fs(1)1621) have an abnormal germ line. Instead of producing eggs, the germ-line cells proliferate forming ovarian tumors or excessive numbers of nurse cells. The Sex-lethal gene product(s) regulate the branch point of the dosage compensation and sex determination pathways in the soma. The role of Sex-lethal in the germ line is not clear but the germ line of females homozygous for female sterile Sex-lethal alleles or germ-line clones of loss-of-function alleles are characterized by ovarian tumors. Females heterozygous for sans fille(1621) or Sex-lethal are phenotypically wild type with respect to viability and fertility but females trans-heterozygous for sans fille(1621) and Sex-lethal show ovarian tumors, somatic sexual transformations, and greatly reduced viability.


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