Genetic regulation of CNC expression in the pharnygeal primordia ofDrosophila blastoderm embryos.

摘要: Genetic controls regulating the establishment of pharyngeal primordia in anterior region Drosophila embryo were investigated through analysis expression thecnc gene, which is continuously expressed specificially three segments. The spatial regulation ofcnc gene transcription was analyzed by situ hybridization CNC transcript-specific probes to embryos mutant for other cephalic patterning genes. domain (corresponding labral segment primordium) found be activated bybicoid andtorso maternal pathways, independently known zygotic gap genes, and sequentially constricted its final size repression from neighboring region-specific Control posterior intercalary mandibular primordia) involved combinatorial genes: activation thebtd theotd anteriorly thesna ventrally. Surprisingly, shifted relative segmentation plan mutants theems gene. These regulatory establishing limits suggest that one mechanism within terminal may involve direct gene(s) factors over a relatively broad followed constriction adjacently