Expression pattern inferred from unspecified enhancer trap line.
is expressed in lateral stripes in the presumptive neurogenic ectoderm.
In wing and leg imaginal discs, sog
transcript is expressed in stripes running parallel to the dpp
stripe along the compartment border. sog
transcripts are expressed in complementary patterns during pupal wing vein development. sog
transcript is first detected in 18-20 hr pupae, in the center of the intervein domains. By 25-30 hr, sog
is expressed in most of the intervein cells. Double labeling experiments with sog
transcripts show that sog
are expressed in a strictly complementary pattern in most of the pupal wing, with the exception of the L5 vein, where there is a one-cell-wide gap between sog
During cycle 14, sog
is expressed in a broad lateral stripe 14-16 cells wide. The dorsal boundary of the sog
expression domain abuts the ventral boundary of the dpp
domain as early as cycle 13. Later, sog
expression fades from its dorsal limits and there is a gap between the sog
expression domains. The ventral border of the sog
expression domain is marked by the mesectoderm and includes the single row of mesectodermal cells. sog
expression is progressively lost dorsally during late blastoderm and early gastrulation. By germ band extension, the transcripts are confined to the ventral midline. Transcripts are localized apically within the cells. At full germ band extension, sog
is expressed in a pattern of lateral patches dorsal to the tracheal pits that fuse to form a lateral stripe running between the two stripes of dpp
expression. After germ band retraction, sog
is expressed in ventral epidermal cells in a pattern resembling the outline of future denticle belts. Internally, sog
is expressed in a series of bands in the endoderm of the gut and in the esophagus. While generally out of phase, endodermal cells expressing sog
and visceral mesoderm cells expressing dpp
are in contact at the junction of the gut with the esophagus.