Genetics, Vol. 162, 273-284, September 2002, Copyright © 2002

Identification of X-Linked Genes Required for Migration and Programmed Cell Death of Drosophila melanogaster Germ Cells

Clark R. Coffmana, Rachel C. Strohma, Fredrick D. Oakleya, Yukiko Yamadaa, Danielle Przychodzinb, and Robert E. Boswellb
a Department of Zoology and Genetics, Iowa State University, Ames, Iowa 50011-3260
b Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, Colorado 80309

Corresponding author: Clark R. Coffman, 3258 Molecular Biology Bldg., Iowa State University, Ames, IA 50011-3260., ccoffman{at}iastate.edu (E-mail)

Communicating editor: T. SCHÜPBACH

Drosophila germ cells form at the posterior pole of the embryo and migrate to the somatic gonad. Approximately 50% of the germ cells that form reach their target. The errant cells within the embryo undergo developmentally regulated cell death. Prior studies have identified some autosomal genes that regulate germ cell migration, but the genes that control germ cell death are not known. To identify X-linked genes required for germ cell migration and/or death, we performed a screen for mutations that disrupt these processes. Here we report the identification of scattershot and outsiders, two genes that regulate the programmed death of germ cells. The scattershot gene is defined by a mutation that disrupts both germ cell migration and the death of germ cells ectopic to the gonad. Maternal and zygotic expression of scattershot is required, but the migration and cell death functions can be genetically uncoupled. Zygotic expression of wild-type scattershot rescues germ cell pathfinding, but does not restore the programmed death of errant cells. The outsiders gene is required zygotically. In outsiders mutant embryos, the appropriate number of germ cells is incorporated into the gonad, but germ cells ectopic to the gonad persist.




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