Frequent Mutation of rs13281615 and Its Association with PVT1 Expression and Cell Proliferation in Breast Cancer

a.
Department of Genetics and Cell Biology, Nankai University College of Life Sciences, Tianjin 300071, China
b.
Key Laboratory of Breast Cancer Research, Department of Breast Cancer Pathology and Research Laboratory, Cancer Hospital of Tianjin Medical University, Tianjin 300060, China
c.
Department of Hematology and Medical Oncology, Emory University School of Medicine, Emory Winship Cancer Institute, Atlanta 30322, USA

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Corresponding author: E-mail address: jtdongus@yahoo.com (Jin-Tang Dong)

摘要

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Abstract: The q24 band of chromosome 8 (8q24) is frequently amplified in human cancers including breast cancer, and several SNPs (single nucleotide polymorphisms) at 8q24, including rs13281615, have been identified for their association with cancer risks. These SNPs are in a “gene desert” region, and their functions in cancer development remain to be illustrated, although several of the SNPs appear to influence the genes in the “desert” in a long-range manner, including the v-myc avian myelocytomatosis viral oncogene homolog (MYC) and the non-protein coding plasmacytoma variant translocation 1 (PVT1), both of which have been implicated in human cancers. In the current study, we examined rs13281615 for its potential role in breast cancer using normal and cancer tissues from 121 Chinese women with breast cancer. In addition to confirming the association of the GG genotype of rs13281615 with breast cancer risk, we found that germline GG genotype was significantly associated with estrogen receptor (ER) positivity, higher tumor grade and higher proliferation index. We also found frequent somatic mutations (22/121 or 18.2%) of this SNP in breast cancer. Interestingly, the majority of the mutations (17/22 or 77%) involved a G→A change, resulting in a decrease in the number of cancers with the GG risk genotype and subsequent loss of GG association with higher tumor grade and proliferation index in cancers. Furthermore,PVT1 expression was increased in cancers, and the increase was associated with the GG genotype of rs13281615. These results suggest that the GG genotype of SNP rs13281615 plays a role in breast cancer likely by influencing PVT1 expression, and that during oncogenesis, “protective” mutations could occur.
- rs13281615 /
- Mutation /
- Breast cancer

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