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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Comparative genomics on ROR1 and ROR2 orthologs.

Transmembrane proteins with extracellular Frizzled domain, such as ROR1, ROR2, MUSK, MFRP, FZD1, FZD2, FZD3, FZD4, FZD5, FZD6, FZD7, FZD8, FZD9 and FZD10, are key molecules for WNT signaling network. Here, comparative integromics analyses on ROR1 and ROR2 orthologs were performed by using bioinformatics. Zebrafish ror2 gene, consisting of nine exons, was identified within CR-450684.3 genome sequence. CV490605.1 EST corresponded to the 5'-end of zebrafish ror2 mRNA, and BM533602.1 EST corresponded to the 3'-end. Zebrafish ror2 gene was found to encode a 939-aa transmembrane protein, showing 71.7% and 56.2% total amino-acid identity with human ROR2 and ROR1, respectively. Immunoglobulin-like domain, Frizzled domain, Kringle domain within the extracellular region, tyrosine kinase domain, Ror homology C-terminal (RORHC) domain and juxta-C-terminal LLGD motif within the cytoplasmic region were conserved among vertebrate ROR1 and ROR2 orthologs. SH2 binding site within the RORHC domain was conserved among vertebrate ROR2 orthologs, but not among vertebrate ROR1 orthologs. ROR1 mRNA was expressed in embryonic stem (ES) cells, infant brain, renal cancer, and colon cancer. ROR2 mRNA was expressed in parathyroid, testis, uterus, and also in diffuse type gastric cancer with signet ring cell features. ROR2 promoter rather than ROR1 promoter was more evolutionarily conserved. WNT5A and ROR family receptors, co-expressed in ES cells and gastric cancer, are implicated in the planar cell polarity (PCP) pathway. ROR1 and ROR2 are the pharmacogenomics targets in the fields of stem cell biology and oncology.[1]


  1. Comparative genomics on ROR1 and ROR2 orthologs. Katoh, M., Katoh, M. Oncol. Rep. (2005) [Pubmed]
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