Cloning, Expression Analysis, and Chromosomal Localization of BH-Protocadherin (PCDH7), a Novel Member of the Cadherin Superfamily |
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| Authors: | Kenichi Yoshida Kiyomi Yoshitomo-Nakagawa Naohiko Seki Masahide Sasaki Sumio Sugano |
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| Affiliation: | aDepartment of Virology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo, 108, Japan;bLaboratory of Gene Structure I, Kazusa DNA Research Institute, Kisarazu, 292, Japan;cDepartment of Biological Science and Technology, Science University of Tokyo, Chiba, 278, Japan |
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| Abstract: | We have identified a novel member of the cadherin superfamily. Among the members of the superfamily, this protein exhibited the highest overall homology with protocadherin-1 (46–49% identity). Its mRNA was predominantly expressed in the brain and heart. Hence, we named the gene BH-protocadherin (BH-Pcdh) (HGMW-approved symbol PCDH7). BH-Pcdh has an extracellular domain consisting of seven repeats of the cadherin motif (EC 1 to 7). EC2 of BH-Pcdh is unique in having a 55-amino-acid insertion in the middle of the motif. There are three isoforms of BH-Pcdh, denoted -a, -b, and -c, which have different cytoplasmic tails and a 47-amino-acid deletion in the EC2–3 region of BH-Pcdh-c. While only a 9.0-kb message was detected in normal tissues, 4.5- and 9.0-kb mRNA species were seen in the human lung carcinoma cell line A549. Furthermore, only the 4.5-kb mRNA was detected in HeLa cell S3 and human gastric cancer cell lines MKN28 and KATO-III. Southern blot analysis indicated that the BH-Pcdh gene is likely to be conserved among various vertebrates. The BH-Pcdh gene was localized to human chromosome 4p15. Interestingly, 4p15 is a region of loss of heterozygosity in some head and neck squamous cell carcinomas. |
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