Expression pattern inferred from unspecified enhancer trap line.
esg transcript is detected in stage 14 of embryogenesis, in presumptive wing, leg, and haltere discs, as well as in the histoblast nests, head, trachea, and the central nervous system. At stage 16,
esg transcript is still present in imaginal cells and in the presumptive head. In third instar larvae,
esg transcript is expressed in the the central nervous system and in the imaginal discs.
esg expression is strongest in the dorsal section of the leg, wing, haltere and eye-antennal discs of third instar larvae.
esg transcripts are expressed throughout embryogenesis and are again detected in pupal stages. In embryos, expression is primarily ectodermal and the pattern is very dynamic. Expression is detected in patches along the dorsal surface in the syncytial blastoderm and at the cellular blastoderm stage. Just prior to gastrulation, the dorsal expression disappears and a grid-like pattern of expression is seen in the neurogenic region of the ventral ectoderm. As germband extension begins, this develops into a pattern of longitudinal stripes in the neurogenic ectoderm. At the beginning of germband retraction, expression is most prominent in the cells of the ventral midline. During germband retraction the pattern is very dynamic including transient expression in cells of the peripheral nervous system. After germband retraction, expression is strong in the leg discs, wing disc, haltere disc and genital disc. Strong expression is also observed in the head region in cells outlining the site of head involution, in the dorsal ridge and in the frontal sac. Staining is also observed in histoblast cells of the abdominal segments.
