Xenbase Image ID: 1831

Fig. 2. Spatial expression pattern of Xisl-1. (A) Xisl-1 is expressed in the anteriormost region of the embryo (shown from an anterior view, dorsal is up) including the cement gland anlage (asterisk) and the cardiac crescent (arrow). (B) During early neurula stages Xisl-1 expression extends dorsally adjacent to the neural folds (cephalic placodal area) (arrows). (C) Xisl-1 mRNA additionally marks the profundal–trigeminal placodal area. (D) A parasagittal section (anterior is to the left, dorsal is up) shows the expression of Xisl-1 in the anterior mesendoderm (arrow). (E) At neural tube stages Xisl-1 transcripts are present in the cardiac crescent (arrow) and are also detected in the stomodeum abutting the cement gland on the dorsal side (arrowhead). Xisl-1 expression is maintained in the cephalic placodes and their associated ganglia at least until st. 36 (E–K and data not shown). (F) Xisl-1 is expressed in the heart region (arrow). Punctate expression is seen in precursor cells of the developing vascular system (arrowheads). (G) Xisl-1 transcripts are abundant in the foregut endoderm and pharyngeal mesoderm and expression in the heart region has become restricted to an anterior domain (arrow); arrowhead points to pineal gland. (H) Co-staining for Xisl-1 (light blue) and Nkx2.5 (dark blue) shows that Xisl-1 is expressed more anteriorly compared to Nkx2.5. (I–K) Expression of Xisl-1 in the developing heart (asterisk) decreases and becomes restricted to a dorsolateral domain. aa: aortic arches; IFT: inflow tract; lpm: lateral plate mesoderm; np: neural plate; pPrV: profundal–trigeminal placodal area; gPr: profundal ganglion; gV: trigeminal ganglion; gVII: ganglia of facial nerve VII. Image published in: Brade T et al. (2007) Copyright © 2007. Image reproduced with permission of the Publisher, Elsevier B. V. Gene Synonyms Species Stage(s) Tissue isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 13 cement gland primordium nkx2-5.L AR2, csx, Nkx-2.5, nkx-2.5, nkx2-5-a, nkx2-5-b, nkx2.5, tinman, XNkx-2.5, XNkx2-5 X. laevis Throughout NF stage 28 heart primordium isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 14 cement gland primordium anterior neural fold isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 15 cement gland primordium profundus ganglion mesoderm anterior cardiac mesoderm isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 19 cement gland primordium cardiac mesoderm profundus ganglion isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 25 facial nerve cardiac mesoderm profundus ganglion trigeminal ganglion isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 28 pineal gland facial nerve cardiac mesoderm trigeminal ganglion isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 29 and 30 pineal gland facial nerve cardiac mesoderm trigeminal ganglion spinal cord isl1.S islet-1, islet1, Xisl-1, Xislet-1 X. laevis Throughout NF stage 32 pineal gland facial nerve cardiac mesoderm retina olfactory placode lateral plate mesoderm spinal cord Image source: Published Larger Image Printer Friendly View

Return to previous page