Skip to main content
Figure 3 | EvoDevo

Figure 3

From: Molecular conservation of metazoan gut formation: evidence from expression of endomesoderm genes in Capitella teleta (Annelida)

Figure 3

Expression of Otx, Blimp1, Bra, Nkx2.1a, FoxAB and Gsc during larval development in Capitella teleta . Each row shows expression (blue color) for the single gene listed at the left margin. The stage of development for the larvae in each column is listed at the top margin. The orientation of each larva is listed at the bottom right corner of every panel (vent, ventral view; lat, lateral view). For each row, columns 1 and 2 are different views of the same stage 4 larva; columns 3 and 4 are different views of the same stage 6 larva. Anterior is to the left in all panels; ventral is down for each lateral view. A black or white asterisk marks the position of the mouth. (A-B) Ct-otx is expressed in anterior ectoderm, including the brain (white arrowheads), in the stomodeum (white arrows) endoderm (black arrows) and hindgut primordia (black arrowheads) at stage 4. (C-D) Ct-otx is expressed in the brain (white arrowheads) foregut (white arrows) posterior segments (dashed black arrows) and surface cells on the ventral midline (dashed white arrow) at stage 6. (E-H) Ct-blimp1 is expressed in endoderm (black arrow) at stage 4, and in the brain (white arrowheads) foregut (white arrows) most segments of the trunk (black arrows) and the posterior growth zone (dashed black arrows) at stage 6. (I-L) Ct-bra is expressed on the posterior side of the foregut (white arrows) and in ectoderm at the posterior-most end of the body (black arrowheads) of stage 4 larvae, and in the brain (white arrowheads) foregut (white arrows) and anus (black arrowheads) at stage 6. (M-P) Ct-nkx2.1a is expressed in the brain (white arrowheads) foregut (white arrows) endoderm (black arrow) and hindgut (black arrowheads) in stage 4 and stage 6 larvae. (Q-T) Ct-foxAB is expressed primarily in surface cells around the mouth (white arrows) and also lateral to the mouth (black arrows, S) at stage 4 and stage 6. (U-V) Ct-gsc is expressed in surface cells around the mouth (white arrows) at stage 4. (W-X) Ct-gsc is expressed in ectoderm cells anterior to the brain (white arrowheads) and in several anterior cells flanking each side of the brain and foregut (white arrows) in stage 6 larvae. The image in each panel was created by combining micrographs from a series of focal planes.

Back to article page