Expression of the Ror1 and Ror2 receptor tyrosine kinase genes during mouse development.
Ror1 and Ror2 are orphan receptor tyrosine kinases that are most closely related to MuSK and the Trk family of neurotrophin receptors. We report the results of an extensive in situ hybridisation survey of the expression of these genes during mouse development. Expression of Ror1 and Ror2 differs markedly at early stages (E8.5--E9.5). At these times, Ror2 is expressed much more widely than Ror1, expression of which is largely restricted to head mesenchyme. At later stages of development (E12.5--E14.5), Ror1 expression expands and Ror2 expression becomes more restricted than at earlier times, although expression of Ror1 continues to be more restricted than that of Ror2. These changes result in overlapping expression domains but with major differences remaining. In many cases Ror1 is expressed in a sub-set of Ror2-expressing tissues; in others, there is complementary expression of Ror1 and Ror2. Ror1 and Ror2 are both expressed in derivatives of all three germ layers and in most organ systems, including the nervous, circulatory, respiratory, digestive, urogenital and skeletal systems. Conspicuous themes are the expression in major sense organs, and in neural crest and its derivatives.
Al-Shawi
R
R
Department of Anatomy and Developmental Biology, Royal Free and University College Medical School, University College London, Royal Free Campus, Rowland Hill Street, London, NW3 2PF, UK.
Ashton
S V
SV
Underwood
C
C
Simons
J P
JP
D000818:Animals; D018507:Gene Expression Regulation, Developmental; D051379:Mice; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008969:Molecular Sequence Data; D020794:Receptor Protein-Tyrosine Kinases / Q000235:genetics* / Q000378:metabolism; D057050:Receptor Tyrosine Kinase-like Orphan Receptors; D011956:Receptors, Cell Surface / Q000235:genetics* / Q000378:metabolism
D011956:Receptors, Cell Surface; C078716:ROR1 protein, human; C078717:ROR2 protein, human; D020794:Receptor Protein-Tyrosine Kinases; D057050:Receptor Tyrosine Kinase-like Orphan Receptors