The dynamic transmission of positional information in < i > stau < /i > -mutants during < i > Drosophila < /i > embryogenesis

It has been suggested that Staufen (Stau) is key in controlling the variability of the posterior boundary of the Hb anterior domain (xHb). However, its underlying mechanism is elusive. Here, we quantified the dynamic 3D expression of segmentation genes inDrosophila embryos. With improved control of measurement errors, we showxHb ofstau- mutants reproducibly moves posteriorly by 10% of the embryo length (EL) to the wild type (WT) position in the nuclear cycle (nc) 14, and its variability at short time windows is comparable as that of the WT. Moreover, forstau- mutants, the upstream Bicoid (Bcd) gradients show equivalent relative intensity noise to that of the WT in nc12-nc14, and the downstream Even-skipped (Eve) and cephalic furrow (CF) show the same positional errors as the WT. Our results indicate that threshold-dependent activation and self-organized filtering are not mutually exclusive but could both be implemented in earlyDrosophila embryogenesis.
Source: eLife - Category: Biomedical Science Tags: Computational and Systems Biology Developmental Biology Source Type: research