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Canonical WNT signals are transduced through Frizzled (FZD) family receptor and LRP5/LRP6 co-receptor to upregulate FGF20, JAG1, DKK1, WISP1, CCND1 and MYC genes for cell-fate determination, while non-canonical WNT signals are transduced through FZD family receptor and ROR2/PTK7/RYK co-receptor to activate RHOA/RHOU/RAC/CDC42, JNK, PKC, NLK and NFAT signaling cascades for the regulation of tissue polarity, cell movement, and adhesion. We previously reported molecular cloning and characterization of human FZD5, which showed six amino-acid substitutions with human Hfz5. FZD5, functioning as WNT5A receptor, is the key molecule in the fields of oncology, regenerative medicine, cardiology, rheumatology, diabetology, and gastroenterology. Here, comparative integromics analyses on FZD5 orthologs were performed by using bioinformatics (Techint) and human intelligence (Humint). Chimpanzee FZD5 and cow Fzd5 genes were identified within NW_104292.1 and AC166656.2 genome sequences, respectively. FZD5 orthologs were seven-transmembrane proteins with extracellular Frizzled domain, leucine zipper motif around the 5th transmembrane domain, and cytoplasmic DVL- and PDZ-binding motifs. Ser523 and Ser529 around the DVL-binding motif of FZD5 orthologs were putative aPKC phosphorylation sites. POU5F1 (OCT4)-binding site linked to SP1-binding site within the 5'-promoter region of human FZD5 gene was evolutionarily conserved among mammalian FZD5 orthologs. POU5F1 was more related to POU2F and POU3F subfamily members. POU5F1 was preferentially expressed in undifferentiated human embryonic stem (ES) cells, pancreatic islet, and diffuse-type gastric cancer. POU2F1 (OCT1) was expressed in ES cells, fetal liver/spleen, adult colon, POU2F2 in ES cells, fetal liver/spleen, and POU2F3 in diffuse-type gastric cancer. Multiple SP1/KLF family members, other than KLF2 or KLF4, were expressed in undifferentiated human ES cells. Together, these facts indicate that POU5F1 and POU2F subfamily members play a pivotal role for the FZD5 expression in undifferentiated human ES cells, fetal liver/spleen, adult colon, pancreatic islet, and diffuse-type gastric cancer.

international journal of oncology

Conserved POU-binding site linked to SP1-binding site within FZD5 promoter: Transcriptional mechanisms of FZD5 in undifferentiated human ES cells, fetal liver/spleen, adult colon, pancreatic islet, and diffuse-type gastric cancer