The lmx1b gene is pivotal in glomus development in Xenopus laevis.
| Title: | The lmx1b gene is pivotal in glomus development in Xenopus laevis. |
|---|---|
| Authors: | Haldin CE; Department of Biological Sciences, Warwick University, Coventry, CV4 7AL, UK.; Massé KL; Bhamra S; Simrick S; Kyuno J; Jones EA |
| Source: | Developmental biology [Dev Biol] 2008 Oct 01; Vol. 322 (1), pp. 74-85. Date of Electronic Publication: 2008 Jul 21. |
| Publication Type: | Journal Article; Research Support, Non-U.S. Gov't |
| Language: | English |
| Journal Info: | Publisher: Elsevier Country of Publication: United States NLM ID: 0372762 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1095-564X (Electronic) Linking ISSN: 00121606 NLM ISO Abbreviation: Dev Biol Subsets: MEDLINE |
| Imprint Name(s): | Publication: San Diego, CA : Elsevier; Original Publication: New York. |
| MeSH Terms: | Homeodomain Proteins/*physiology ; Kidney/*embryology ; Kidney/*metabolism ; Transcription Factors/*physiology ; Xenopus laevis/*embryology; DNA-Binding Proteins/genetics ; DNA-Binding Proteins/metabolism ; Gene Expression Regulation, Developmental/drug effects ; Gene Expression Regulation, Developmental/genetics ; Homeodomain Proteins/biosynthesis ; Homeodomain Proteins/genetics ; Homeodomain Proteins/metabolism ; Kidney/cytology ; RNA, Messenger/metabolism ; RNA, Messenger/pharmacology ; Transcription Factors/biosynthesis ; Transcription Factors/genetics ; Xenopus Proteins/genetics ; Xenopus Proteins/metabolism ; Xenopus laevis/genetics ; Animals ; Cell Culture Techniques ; Embryo, Nonmammalian ; Gene Targeting ; In Situ Hybridization ; LIM-Homeodomain Proteins ; Microinjections ; RNA Interference ; Reverse Transcriptase Polymerase Chain Reaction |
| Abstract: | We have previously shown that lmx1b, a LIM homeodomain protein, is expressed in the pronephric glomus. We now show temporal and spatial expression patterns of lmx1b and its potential binding partners in both dissected pronephric anlagen and in individual dissected components of stage 42 pronephroi. Morpholino oligonucleotide knock-down of lmx1b establishes a role for lmx1b in the development of the pronephric components. Depletion of lmx1b results in the formation of a glomus with reduced size. Pronephric tubules were also shown to be reduced in structure and/or coiling whereas more distal tubule structure was unaffected. Over-expression of lmx1b mRNA resulted in no significant phenotype. Given that lmx1b protein is known to function as a heterodimer, we have over-expressed lmx1b mRNA alone or in combination with potential interacting molecules and analysed the effects on kidney structures. Phenotypes observed by over-expression of lim1 and ldb1 are partially rescued by co-injection with lmx1b mRNA. Animal cap experiments confirm that co-injection of lmx1b with potential binding partners can up-regulate pronephric molecular markers suggesting that lmx1b lies upstream of wt1 in the gene network controlling glomus differentiation. This places lmx1b in a genetic hierarchy involved in pronephros development and suggests that it is the balance in levels of binding partners together with restricted expression domains of lmx1b and lim1 which influences differentiation into glomus or tubule derivatives in vivo. |
| Grant Information: | G19888 United Kingdom BB_ Biotechnology and Biological Sciences Research Council; G19888 United Kingdom MRC_ Medical Research Council |
| Substance Nomenclature: | 0 (DNA-Binding Proteins); 0 (Homeodomain Proteins); 0 (LIM homeobox transcription factor 1 beta); 0 (LIM-Homeodomain Proteins); 0 (Lhx1 protein, Xenopus); 0 (RNA, Messenger); 0 (Transcription Factors); 0 (XLdb1 protein, Xenopus); 0 (Xenopus Proteins) |
| Entry Date(s): | Date Created: 20080809 Date Completed: 20081118 Latest Revision: 20250529 |
| Update Code: | 20260130 |
| DOI: | 10.1016/j.ydbio.2008.07.012 |
| PMID: | 18687324 |
| Database: | MEDLINE |
Journal Article; Research Support, Non-U.S. Gov't