title: Expression of receptor protein tyrosine phosphatases in embryonic chick spinal cord.
abstract: Receptor-like protein tyrosine phosphatases potentially play a crucial role in axon growth and targeting. We focus here on their role within the embryonic avian spinal cord, in particular the development and outgrowth of motorneurons. We have used in situ mRNA hybridization to examine the spatiotemporal expression of eight receptor-like protein tyrosine phosphatases and find that it is both dynamic and highly varied, including novel, isoform-specific expression patterns. CRYP alpha 1 is expressed in all of the ventral motorneuron pools, whereas CRYP2, RPTP gamma, and RPTP alpha are only expressed in specific subsets of these neurons. CRYP alpha 2, RPTP psi, and RPTP delta are neuronally expressed elsewhere in the cord, but not in ventral motorneurons, whereas RPTP mu is unique in being restricted to capillaries. The developmentally regulated expression of these genes strongly suggests that the encoded phosphatases play numerous roles during neurogenesis and axonogenesis in the vertebrate spinal cord.
authors.affiliation: Neural Development Unit, Institute of Child Health, London, United Kingdom.
authors.forename: J K
authors.initials: JK
authors.lastname: Chilton
authors.forename: A W
authors.initials: AW
authors.lastname: Stoker
mesh_terms: D000818:Animals; D030161:Avian Proteins; D002642:Chick Embryo; D018507:Gene Expression Regulation, Developmental; D015971:Gene Expression Regulation, Enzymologic; D017403:In Situ Hybridization; D009046:Motor Neurons / Q000201:enzymology; D009419:Nerve Tissue Proteins / Q000235:genetics; D017027:Protein Tyrosine Phosphatases / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D054557:Receptor-Like Protein Tyrosine Phosphatases; D054623:Receptor-Like Protein Tyrosine Phosphatases, Class 2; D054630:Receptor-Like Protein Tyrosine Phosphatases, Class 4; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5; D011956:Receptors, Cell Surface; D013116:Spinal Cord / Q000166:cytology / Q000196:embryology* / Q000201:enzymology*
chemical_list: D030161:Avian Proteins; D009419:Nerve Tissue Proteins; D012333:RNA, Messenger; D011956:Receptors, Cell Surface; C490606:CRYPalpha protein, Gallus gallus; D017027:Protein Tyrosine Phosphatases; D054557:Receptor-Like Protein Tyrosine Phosphatases; D054623:Receptor-Like Protein Tyrosine Phosphatases, Class 2; D054630:Receptor-Like Protein Tyrosine Phosphatases, Class 4; D054633:Receptor-Like Protein Tyrosine Phosphatases, Class 5