![]() ![]() First, maternally provided factors form anterior to posterior and posterior to anterior morphogen gradients, that then regulate the zygotically expressed gap genes (GGs) (e.g. In the dipteran fly Drosophila melanogaster, a hierarchic segmentation gene cascade almost synchronously controls the patterning of the early embryo along the anterior-posterior (AP) body axis into a defined number of single segments (reviewed in e.g. The previously reported differences between the function of slp in Drosophila and Tribolium may partially account for the function of the newly identified second slp paralog in Tribolium, and it may therefore be advised to conduct further studies on PRG function in the beetle. While the previously identified gene, slp, is expressed in a typical PRG pattern, expression of slp2 is more similar to that of the downstream-acting SPGs, and shows expression similarities to slp2 in Drosophila. In this study, I present the identification and the analysis of embryonic expression patterns of a second slp gene (called slp2) in Tribolium. ![]() In earlier studies, the interaction of PRGs and the role of the single slp ortholog in Tribolium have been investigated in some detail revealing conserved and diverged aspects of PRG function. While the complement of primary PRGs is different in Drosophila and the beetle Tribolium, another arthropod model organism, both paired ( prd) and sloppy-paired ( slp), acts as secondary PRGs. Within the PRG network, primary PRGs regulate secondary PRGs that are directly involved in the regulation of the next lower level, the segment-polarity genes (SPGs). Within this cascade, the pair-rule genes (PRGs) transform the more uniform patterning of the higher-level genes into a metameric pattern that first represents double-segmental units, and then, in a second step, represents a true segmental pattern. ![]() In the fly Drosophila melanogaster, a hierarchic segmentation gene cascade patterns the anterior-posterior body axis of the developing embryo. ![]()
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