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Fig. 2. Early ventral and lateral Poxm expression complementary to dorsal high
Tin expression in somatic mesoderm precedes its expression in progenitors of
ventral and lateral somatic muscles and in a specific subset of muscle
founders. (A-C) Early Poxm expression is restricted to the ventral
and lateral somatic mesoderm. Poxm expression (B) and high levels of Twi (A),
which mark the somatic mesoderm (Dunin
Borkowski et al., 1995; Baylies
and Bate, 1996) can be seen to coincide in the ventral and lateral
regions of the somatic mesoderm (C), as observed by confocal microscopy. A
ventral view of four abdominal parasegments of a late stage 10/early stage 11
embryo, oriented with their anterior to the left. (D-F) Complementary
expression patterns of Poxm and high levels of Tin in the somatic mesoderm.
Poxm expression in the ventral and lateral regions (E) abuts high expression
levels of Tin in the dorsal region (D), but coincides with lower levels of Tin
(F) in an early stage 11 embryo shown in a ventral view. (G-I) Poxm is
expressed in cells of promuscular clusters and muscle progenitors. Poxm (G)
and L(1)sc (H) expression coincide in many ventral and lateral muscle
progenitors (I), as observed by double-labeling of Poxm and L(1)sc. Some cell
clusters and single progenitors that coexpress L(1)sc and Poxm are indicated
by arrows and arrowheads, respectively. Three abdominal parasegments, oriented
with their anterior to the left, are shown on both sides of the ventral
midline of a mid stage 11 embryo. (J-L) Poxm is expressed in specific
muscle founders and in the ventral adult precursor. Lateral views of four
abdominal hemisegments of a stage 12 embryo double-labeled for late Poxm (J)
and Slou (K) expression, oriented with its anterior to the left, revealed by
confocal microscopy. In the hemisegment where muscle founders are marked by
arrows, expression of late Poxm and Slou coincide (L) in the founders of
muscles DO3, DT1, VA2, VA3, and in the ventral adult muscle precursor VaP,
whereas Slou has disappeared from the VA1 founder that continues to express
Poxm (Carmena et al., 1995;
Dohrmann et al., 1990).
Expression of Slou in the founders of VT1 and LO1, which do not express Poxm,
is also clearly visible (Carmena et al.,
1995; Dohrmann et al.,
1990).
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