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Argonaute 2 and nasopharyngeal carcinoma: a genetic association study and functional analysis
Peiyao Li1, Jinfeng Meng2,3, Yun Zhai4
1State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, No. 27, Taiping Road, Haidian District, Beijing, 100850, P.R. China. lipeiyao214@gmail.com.
Background:
Argonaute 2 (AGO2), a central component of RNA-induced silencing complex, plays critical roles in cancer. We examined whether the single nucleotide polymorphisms (SNPs) of AGO2 were related to the risk of nasopharyngeal carcinoma (NPC).
Methods:
Twenty-five tag SNPs within AGO2 were genotyped in Guangxi population consisting of 855 NPC patients and 1036 controls. The SNPs significantly associated with NPC were further replicated in Guangdong population consisting of 996 NPC patients and 972 controls. Functional experiments were conducted to examine the biologic roles of AGO2 in NPC.
Results:
A significantly increased risk of advanced lymph node metastasis of NPC was identified for the AGO2 rs3928672 GA + AA genotype compared with GG genotype in both the Guangxi and Guangdong populations (combined odd ratio = 2.08, 95 % confidence interval = 1.44-3.01, P = 8.60 × 10(-5)). Moreover, the AGO2 protein expression levels of rs3928672 GA + AA genotype carriers were higher than the GG genotype carriers in the NPC tissues (P = 0.041), and AGO2 was significantly over-expressed in NPC tissues compared with non-cancerous nasopharyngeal tissues (P = 0.011). In addition, AGO2 knockdown reduced cell proliferation, induced apoptosis, and inhibited migration of NPC cells. Furthermore, gene expression microarray showed that genes altered following AGO2 knockdown were clustered in tumorigenesis and metastasis relevant pathways.
Conclusions:
Our findings suggest that the genetic polymorphism in AGO2 may be a risk factor for the advanced lymph node metastasis of NPC in Chinese populations, and AGO2 acts as an oncogene in the development of NPC.
Insights
Genetic variations in Argonaute 2 (AGO2) are linked to nasopharyngeal carcinoma (NPC) metastasis risk. AGO2 functions as an oncogene, promoting NPC development and progression.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Argonaute 2 (AGO2) is crucial in RNA silencing and cancer development.
- The role of AGO2 single nucleotide polymorphisms (SNPs) in nasopharyngeal carcinoma (NPC) risk is unclear.
Purpose of the Study:
- To investigate the association between AGO2 SNPs and NPC risk.
- To explore the functional role of AGO2 in NPC pathogenesis.
Main Methods:
- Genotyping of 25 tag SNPs in AGO2 across two Chinese populations (Guangxi and Guangdong).
- Case-control study involving 855 NPC patients and 1036 controls (Guangxi), and 996 NPC patients and 972 controls (Guangdong).
- Functional assays including AGO2 protein expression analysis, knockdown experiments, and gene expression microarray.
Main Results:
- The AGO2 rs3928672 GA + AA genotype significantly increased NPC advanced lymph node metastasis risk (OR=2.08, P=8.60 × 10⁻⁵).
- Higher AGO2 protein levels were observed in NPC tissues and in carriers of the risk genotype.
- AGO2 knockdown inhibited NPC cell proliferation, induced apoptosis, and reduced migration, affecting tumorigenesis and metastasis pathways.
Conclusions:
- Genetic polymorphism in AGO2, specifically rs3928672, is a risk factor for advanced lymph node metastasis in NPC.
- AGO2 acts as an oncogene, promoting NPC development and metastasis.
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