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Genetic Analysis of the Drosophila DNAprim Gene: The Function of the 60-kD Primase Subunit of DNA Polymerase Opposes the fat facets Signaling Pathway in the Developing Eye
Xin Chena, Qinghong Lia, and Janice A. Fischeraa Section of Molecular Cell and Developmental Biology, Institute for Cellular and Molecular Biology, University of Texas, Austin, Texas 78712
Corresponding author: Janice A. Fischer, University of Texas, Moffett Molecular Biology Bldg., 2500 Speedway, Austin, TX 78712., jaf{at}mail.utexas.edu (E-mail)
Communicating editor: K. ANDERSON
that synthesizes RNA primers during DNA replication. The precise function of the 60-kD subunit is unknown. In a mutagenesis screen for suppressors of the fat facets (faf) mutant eye phenotype, we identified mutations in DNAprim. The faf gene encodes a deubiquitinating enzyme required specifically for patterning the compound eye. The DNA sequences of four DNAprim alleles were determined and these define essential protein domains. We show that while flies lacking DNAprim activity are lethal, flies with reduced DNAprim activity display morphological defects in their eyes, and unlike faf mutants, cell cycle abnormalities in larval eye discs. Mechanisms by which DNA primase levels might influence the faf-dependent cell communication pathway are discussed.
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