tRFs&tiRNAs sequence in LUAD tissues with micropapillary /solid (High-Risk) component

Despite being the leading cause of lung cancer death, the underlying molecular mechanisms driving metastasis progression are still not fully understood. tRNAs can generate a group of 18-40nt small RNA fragments named tRNA-derived small RNAs (tsRNAs) or tRNA-derived fragments (tRFs). Transfer RNA-derived fragments (tRFs) have been implicated in various biological processes in cancer. However, the role of tRFs in the development and progression of lung adenocarcinoma (LUAD) remains unclear. In the present study, we hypothesized that certain tRFs might become induced during LUAD metastatic progression. In this study, micropapillary and solid component was defined as high-risk, other component was defined as low-risk and adjcent tissue was defined as normal control. Our data revealed a series of dysregulated tRFs in 3 paired LUAD high-risk tissues, low-risk tissues and normal controls. Microdissection was performed after microscopic pinpointing of the High-Risk component and Low-Risk component. To identify and characterize specific differential expressed tRFs&tiRNAs in LUAD tissues with micropapillary /solid (High-Risk) component, tRFs&tiRNAs sequence was performed using 3 pairs of LUAD tissues with micropapillary /solid.With a cutoff criteria of fold change ≧8.0 and P<0.01, 26 significantly dysregulated tRFs&tiRNAs were identified by comparing High-Risk tissues cohort and adjacent normal tissues cohort while comparison between High-Risk tissues cohort and Low-Risk tissues revealed that 57 tRFs&tiRNAs were significantly dysregulated . By overlapping the two dysregulated tRFs&tiRNAs datasets, we obtained 15 significantly dysregulated tRFs&tiRNAs, which were specific differential expressed in High-Risk tissues group, including 9 up-regulated tRFs&tiRNAs and 6 down-regulated tRFs&tiRNAs (High-Risk) component and adjacent normal tissues.