title: The role of eyg Pax gene in the development of the head vertex in Drosophila.
abstract: The Drosophila head vertex is composed of three ocelli, stereotypic bristle patterns and characteristic cuticles. It is derived from the fusion of two eye-antenna discs. The head vertex primordium is located at the anterior-dorsal region of the eye disc. The orthodenticle (otd) homeobox gene is expressed in the primordium and is functionally required for its development and patterning. Here we show that the Pax gene eye gone (eyg) is expressed adjacent to the otd expression domain in the eye disc. otd is required and sufficient to repress eyg transcription, thereby preventing eyg from expressing in the head vertex primordium. In otd mutant, eyg expression is derepressed in the head vertex primordium and is a major negative effector to block head vertex development. Therefore, otd not only needs to induce downstream effector genes to execute the development and patterning of the head vertex development, but also needs to actively repress the negative regulator eyg. In addition, eyg is required for the development of the lateral bristles in the head vertex. So eyg plays both positive and negative roles in head vertex development.
authors.affiliation: Graduate Institute of Life Sciences, National Defense Medical Center, Neihu, Taipei, Taiwan, Republic of China.
authors.forename: Lan-Hsin
authors.initials: LH
authors.lastname: Wang
authors.forename: Yu-Ting
authors.initials: YT
authors.lastname: Huang
authors.forename: Yu-Chen
authors.initials: YC
authors.lastname: Tsai
authors.forename: Y Henry
authors.initials: YH
authors.lastname: Sun
mesh_terms: D000818:Animals; D004268:DNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism*; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000166:cytology / Q000196:embryology* / Q000235:genetics*; D004742:Enhancer Elements, Genetic / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect / Q000235:genetics*; D006257:Head / Q000196:embryology; D053823:Hedgehog Proteins / Q000235:genetics / Q000378:metabolism; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D008957:Models, Genetic; D009928:Organ Specificity / Q000235:genetics; D010641:Phenotype; D015398:Signal Transduction / Q000235:genetics; D014158:Transcription, Genetic; D051155:Wnt1 Protein / Q000235:genetics / Q000378:metabolism
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D053823:Hedgehog Proteins; D018398:Homeodomain Proteins; D051155:Wnt1 Protein; C477040:eyg protein, Drosophila; C093053:oc protein, Drosophila; C074622:wg protein, Drosophila