Squid hnRNP protein promotes apical cytoplasmic transport and localization of Drosophila pair-rule transcripts

Sabbi Lall, Helen Francis-Lang, Antonin Flament, Amanda Norvell, Trudi Schüpbach, David Ish-Horowicz

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72 Scopus citations

Abstract

Drosophila melanogaster pair-rule segmentation gene transcripts localize apically of nuclei in blastoderm embryos. This might occur by asymmetric (vectorial) export from one side of the nucleus or by transport within the cytoplasm. We have followed fluorescently labeled pair-rule transcripts postinjection into Drosophila embryos. Naked, microinjected fushi tarazu (ftz) transcripts do not localize in blastoderm embryos, indicating that cytoplasmic mechanisms alone are insufficient for apical targeting. However, prior exposure of ftz to Drosophila or human embryonic nuclear extract leads to rapid, specific, microtubule-dependent transport, arguing against vectorial export. We present evidence that ftz transcript localization involves the Squid (Hrp40) hnRNP protein and that the activity of hnRNP proteins in promoting transcript localization is evolutionarily conserved. We propose that cytoplasmic localization machineries recognize transcripts in the context of nuclear partner proteins.

Original languageEnglish (US)
Pages (from-to)171-180
Number of pages10
JournalCell
Volume98
Issue number2
DOIs
StatePublished - Jul 23 1999

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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    Lall, S., Francis-Lang, H., Flament, A., Norvell, A., Schüpbach, T., & Ish-Horowicz, D. (1999). Squid hnRNP protein promotes apical cytoplasmic transport and localization of Drosophila pair-rule transcripts. Cell, 98(2), 171-180. https://doi.org/10.1016/S0092-8674(00)81012-0