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First published online 31 March 2004
doi: 10.1242/dev.01078

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Hrb27C, Sqd and Otu cooperatively regulate gurken RNA localization and mediate nurse cell chromosome dispersion in Drosophila oogenesis

Howard Hughes Medical Institute, Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA

^* Author for correspondence (e-mail: gschupbach{at}molbio.princeton.edu)

Accepted 15 January 2004

Heterogeneous nuclear ribonucleoproteins, hnRNPs, are RNA-binding proteins that play crucial roles in controlling gene expression. In Drosophila oogenesis, the hnRNP Squid (Sqd) functions in the localization and translational regulation of gurken (grk) mRNA. We show that Sqd interacts with Hrb27C, an hnRNP previously implicated in splicing. Like sqd, hrb27C mutants lay eggs with dorsoventral defects and Hrb27C can directly bind to grk RNA. Our data demonstrate a novel role for Hrb27C in promoting grk localization. We also observe a direct physical interaction between Hrb27C and Ovarian tumor (Otu), a cytoplasmic protein implicated in RNA localization. We find that some otu alleles produce dorsalized eggs and it appears that Otu cooperates with Hrb27C and Sqd in the oocyte to mediate proper grk localization. All three mutants share another phenotype, persistent polytene nurse cell chromosomes. Our analyses support dual cooperative roles for Sqd, Hrb27C and Otu during Drosophila oogenesis.

Key words: Drosophila, Oogenesis, hnRNP, Gurken, mRNA localization, Nurse cell nuclear morphology, Hrp48

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