First published online April 22, 2004
Development 131, 902e (2004)
© The Company of Biologists Limited
Squid and gurken: a complex interaction
During Drosophila oogenesis, two different isoforms of Squid (Sqd)
a heterogeneous nuclear ribonucleoprotein (hnRNP) regulate the
localisation and translation of gurken (grk) mRNA, whose
restriction to the dorsal anterior region of the oocyte is crucial for
establishing the dorsoventral axis. On
p. 1949, Goodrich and
colleagues investigate the mechanism by which Sqd regulates grk
expression. They show that another hnRNP, Hrb27C, together with the protein
Ovarian tumour (Otu), interacts with Sqd to localise grk mRNA.
Unexpectedly, hrb27C, sqd and otu mutants also have
defective nurse-cell polytene chromosome dispersion. Normally, the visible
polytene chromosomes of nurse cells disperse during early oogenesis, possibly
to facilitate rapid ribosome synthesis. The researchers go on to propose a
model in which Sqd, Hrb27C and Otu function in a single RNP complex that
spatially and temporally regulates different RNA targets in different cell
types.
Related articles in Development:
- Hrb27C, Sqd and Otu cooperatively regulate gurken RNA localization and mediate nurse cell chromosome dispersion in Drosophila oogenesis
- Jennifer S. Goodrich, K. Nicole Clouse, and Trudi Schüpbach
Development 2004 131: 1949-1958.
[Abstract]
[Full Text]