PMID- 9389449 OWN - NLM STAT- MEDLINE DCOM- 19980210 LR - 20090929 IS - 1058-8388 (Print) IS - 1058-8388 (Linking) VI - 210 IP - 3 DP - 1997 Nov TI - Differential expression of the rat retinoid X receptor gamma gene during skeletal muscle differentiation suggests a role in myogenesis. PG - 227-35 AB - Even though previous studies have shown that transcripts encoding the murine retinoid X receptor gamma (RXRgamma) are present in skeletal muscle of mouse embryos and that cultured myoblasts are induced to differentiate upon retinoid treatment, a function for RXRgamma and retinoids in mammalian myogenesis has not yet been identified. To begin to understand the possible role of RXRgamma during mammalian myogenesis we isolated novel rat RXRgamma cDNA sequences and examined in detail the spatio-temporal expression pattern of RXRgamma transcripts in relation to skeletal muscle differentiation in rat embryos and cultured myoblasts. We show that the onset of RXRgamma expression coincides with the differentiation of limb myoblasts in vivo. In vitro, RXRgamma is expressed in differentiating myoblasts, but not in proliferating myoblasts. In the myotome, however, RXRgamma is first expressed after myoblast differentiation, with RXRgamma transcripts being confined initially to its ventral region. Subsequently, RXRgamma becomes expressed throughout limb and myotome-derived muscle masses, and by the end of the primary myogenic wave, RXRgamma transcripts are mainly confined to their periphery. This dynamic expression pattern of RXRgamma during myogenesis suggests its possible involvement in the differentiation of limb myoblasts but excludes a role in the differentiation of early myotomal myoblasts. FAU - Georgiades, P AU - Georgiades P AD - Department of Molecular Pathology, University College London Medical School, England. FAU - Brickell, P M AU - Brickell PM LA - eng SI - GENBANK/AF016387 GR - Wellcome Trust/United Kingdom PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Dev Dyn JT - Developmental dynamics : an official publication of the American Association of Anatomists JID - 9201927 RN - 0 (DNA, Complementary) RN - 0 (DNA-Binding Proteins) RN - 0 (Nuclear Proteins) RN - 0 (Receptors, Retinoic Acid) RN - 0 (Retinoid X Receptors) RN - 0 (Transcription Factors) SB - IM MH - Amino Acid Sequence MH - Animals MH - Base Sequence MH - Cell Differentiation MH - Cells, Cultured MH - DNA, Complementary/chemistry MH - DNA-Binding Proteins/*genetics MH - Gene Expression Regulation MH - Mice MH - Molecular Sequence Data MH - Muscle, Skeletal/cytology/*embryology MH - Nuclear Proteins/*genetics MH - Rats MH - Receptors, Retinoic Acid/*genetics MH - Retinoid X Receptors MH - Transcription Factors/*genetics EDAT- 1997/12/06 11:03 MHDA- 2000/06/22 10:00 CRDT- 1997/12/06 11:03 PHST- 1997/12/06 11:03 [pubmed] PHST- 2000/06/22 10:00 [medline] PHST- 1997/12/06 11:03 [entrez] AID - 10.1002/(SICI)1097-0177(199711)210:3<227::AID-AJA4>3.0.CO;2-I [pii] AID - 10.1002/(SICI)1097-0177(199711)210:3<227::AID-AJA4>3.0.CO;2-I [doi] PST - ppublish SO - Dev Dyn. 1997 Nov;210(3):227-35. doi: 10.1002/(SICI)1097-0177(199711)210:3<227::AID-AJA4>3.0.CO;2-I.