Molecular cloning and characterization of NAG-7: A novel gene downregulated in human nasopharyngeal carcinoma

Yi Xie, Lianghua Bin, Jianbo Yang, Zhonghua Li, Ying Yu, Xiaohui Zhang, Li Cao, Guiyuan Li

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Objective To identify novel tumor suppressor genes at chromosome 3p24-26 in human nasopharyngeal carcinoma (NPC). Methods Twenty epithelial-derived expressed sequence tags (EST) were selected from chromosome 3p24-26. RT-PCR and Northern blot were used to detect the expression of the ESTs in NPC cell line, HNE-1, and primary cultures of normal nasopharyngeal epithelial cells. One EST, which was substantially downregulated in the HNE-1 cell line, was detected in 19 NPC biopsy samples. cDNA library screening was used to get its full sequence and the sequence of this novel gene was analyzed. Results A novel gene located at chromosome 3p25.3 was obtained and named NAG-7. It was downregulated in 26.3% (5/19) of NPC biopsy samples. Its 1677 bp full length cDNA had a potential open reading frame predicting a 94 amino acid protein with a molecular weight of 11023.87 Dalton. Analysis of the NAG-7 gene showed that it was a transmembrane protein containing a protein kinase C phosphorylation site and a myristyl site. It has no significant homology to any reported genes in the database of GenBank. Conclusion NAG-7 is a novel gene downregulated in NPC, suggesting that it may be involved in the development of NPC.

Original languageEnglish (US)
Pages (from-to)530-534
Number of pages5
JournalChinese Medical Journal
Issue number5
StatePublished - May 1 2001


  • Chromosome 3p
  • Gene cloning
  • Nasopharyngeal neoplasm

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