PMID- 10579975 OWN - NLM STAT- MEDLINE DCOM- 19991222 LR - 20190707 IS - 0016-5085 (Print) IS - 0016-5085 (Linking) VI - 117 IP - 6 DP - 1999 Dec TI - Coordinated expression of 3' hox genes during murine embryonal gut development: an enteric Hox code. PG - 1339-51 AB - BACKGROUND & AIMS: Hox genes are highly conserved developmental control genes that may be organized and expressed in the form of a code required for correct morphogenesis. Little is known about their control of the embryonal gut. However, Hox paralogues 4 and 5, which are expressed at the sites of origin of vagal neural crest cells and splanchnic mesoderm, are likely to be important. We have studied the expression domains of these genes in the gut both spatially and temporally. METHODS: CD1 mice embryos of embryonic days E8.5-E17.5 were studied. The spatial and temporal expression patterns of messenger RNA of Hoxa4, b4, c4, d4, a5, c5, and b5 homeoprotein were determined by in situ hybridization and immunohistochemistry in whole embryos, whole gastrointestinal tracts, and vibratome sections. RESULTS: There were different spatial, temporal, and combinatorial expression patterns in different morphological regions: foregut, prececal gut, cecum, and postcecal gut. Two dynamic gradients, rostral and caudal, were coordinated with nested expression domains along the gut primordium. Region-specific domains were present in the stomach and cecum. CONCLUSIONS: The expression patterns of genes in paralogous groups 4 and 5 suggest that they are organized to form a specific enteric Hox code required for correct enteric development. FAU - Pitera, J E AU - Pitera JE AD - Gastroenterology Unit, Institute of Child Health, University College London, London, England. J.Pitera@ich.ucl.ac.uk FAU - Smith, V V AU - Smith VV FAU - Thorogood, P AU - Thorogood P FAU - Milla, P J AU - Milla PJ LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Gastroenterology JT - Gastroenterology JID - 0374630 RN - 0 (DNA-Binding Proteins) RN - 0 (HOXA5 protein, human) RN - 0 (HOXB5 protein, human) RN - 0 (HOXC5 protein, human) RN - 0 (Homeodomain Proteins) RN - 0 (Hoxa4 protein, mouse) RN - 0 (Hoxa5 protein, mouse) RN - 0 (Hoxb4 protein, mouse) RN - 0 (Hoxb5 protein, mouse) RN - 0 (Hoxc4 protein, mouse) RN - 0 (Hoxd3 protein, mouse) RN - 0 (Hoxd4 protein, mouse) RN - 0 (Phosphoproteins) RN - 0 (Transcription Factors) SB - AIM SB - IM MH - Animals MH - DNA-Binding Proteins/biosynthesis/genetics/metabolism MH - Embryonic and Fetal Development MH - Female MH - *Gene Expression MH - Gene Expression Profiling MH - *Genes, Homeobox MH - Homeodomain Proteins/biosynthesis/genetics/metabolism MH - Intestinal Mucosa/metabolism MH - Intestines/*embryology MH - Mice MH - Muscles/metabolism MH - Neurons/metabolism MH - *Phosphoproteins MH - Pregnancy MH - Transcription Factors/biosynthesis/genetics/metabolism EDAT- 1999/12/02 00:00 MHDA- 1999/12/02 00:01 CRDT- 1999/12/02 00:00 PHST- 1999/12/02 00:00 [pubmed] PHST- 1999/12/02 00:01 [medline] PHST- 1999/12/02 00:00 [entrez] AID - S0016508599005478 [pii] AID - 10.1016/s0016-5085(99)70284-2 [doi] PST - ppublish SO - Gastroenterology. 1999 Dec;117(6):1339-51. doi: 10.1016/s0016-5085(99)70284-2.