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Copy number analysis identifies tumor suppressive lncRNAs in human osteosarcoma.
International Journal of Oncology 2017 March
Osteosarcoma (OS) has a high degree of chromosomal instability and total copy number (CN) changes. We examined 58 human OS samples including 40 primary tumors, 11 explants, and 7 cell lines using single nucleotide polymorphism (SNP) arrays, and revealed that 70% of the samples had one or more recurrent CN-neutral loss of heterozygosity (CNN‑LOH) also known as uniparental disomy (UPD). Importantly, 17% of the samples showed prominent homozygous deletion of 3q13.31, suggesting its role in tumorigenesis. We identified and characterized two novel lncRNAs, LOC285194 and BC040587, within this genomic locus, strongly suggesting their tumor suppressor activity. Frequent deletions and UPD suggest that OS often has mutant or non-expressed tumor suppressor genes including two lncRNAs.
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