Project description:Incompletely processed and misprocessed mRNAs as well as numerous noncoding RNAs are retained in the nucleus and often degraded, and defects in this quality control mechanism have been linked to various diseases, including cancer and neurodegeneration. However, the underlying mechanisms remain poorly understood. Here we show that LENG8 is recruited to pre-mRNAs by splicing factors, including the U1 snRNP. Once RNA-bound, LENG8 is both necessary and sufficient to sequester RNA in the nucleus. LENG8 depletion leads to the leakage of misprocessed mRNAs, including intronically polyadenylated and intron-retained mRNAs, as well as noncoding RNAs into the cytoplasm. Mechanistically, we showed that LENG8 binds to PCID2 and SEM1 to form an evolutionarily conserved complex, referred to as REX (repressor of export), and causes RNA nuclear retention by acting as a dominant negative factor for the essential mRNA export factor TREX2. Finally, LENG8 promotes RNA degradation by recruiting the ZFC3H1-MTR4-exosome complex. Thus, LENG8 is a key quality control factor that keeps pre-mRNAs in the nucleus until they are fully and correctly processed.
Project description:To determine the lncRNA expression profile in HCC and matched non-tumor tissues, we used lncRNA microArray analysis form Arraystar to examine the expression of lncRNAs in HCC and matched non-tumor tissues. Goal was to determine the different gene expression between HCC and matched noncancerous tissue.
Project description:Recently, long noncoding rnas (lncRNAs) have been shown to have key roles in the development and prgression of hepatocellular carcinoma (HCC). However, the mechanism that contributes to the HCC biology is unknown, especially at the early and middle stages. In this study, we comprehensively investigaged lnRNAs and mRNAs expression in HCC. We found three significant lnRNAs for diagostic markers in HCC at early stage.
Project description:Although many protein-coding genes have been identified to be aberrantly expressed in hepatocellular carcinoma (HCC), the mechanisms that account for development and progression of HCC remain unclear. In recent years, long noncoding RNAs (lncRNAs) have been shown to have critical regulatory roles in mammalian cell biology. Many lncRNAs can result in aberrant expression of gene products that may contribute to cancer biology. In this study, we first identified non-overlapping signatures of a small number of lncRNAs that are aberrantly expressed in human HCC compared with paired peritumoral tissues. Then we used real-time PCR to validate five lncRNAs whose expression was altered in HCC compared with paired peritumoral tissues. Using loss-of-function and gain-of-function approaches, we found that an lncRNA (termed lncRNA-HEIH) plays a key role in cell cycle regulation. We further demonstrated that lncRNA-HEIH bound to enhancer of zeste homolog 2 (EZH2) and that this interaction was required for the repression of EZH2 target genes. Together, these results reveal insights into the molecular regulation mechanisms of HCC cell cycle regulation and lead us to propose that lncRNAs may serve as key regulatory hubs in cancer biology. A ten chip study using total RNA recovered from five separate HCC tissues and five corresponding paired non-tumor samples.
Project description:This experiment compared the expression of mRNAs and noncoding RNAs during myoblast differentiation. The primary aim of the experiment was to identify ncRNAs that were differentially expressed during myotube formation.
Project description:Although many protein-coding genes have been identified to be aberrantly expressed in hepatocellular carcinoma (HCC), the mechanisms that account for development and progression of HCC remain unclear. In recent years, long noncoding RNAs (lncRNAs) have been shown to have critical regulatory roles in mammalian cell biology. Many lncRNAs can result in aberrant expression of gene products that may contribute to cancer biology. In this study, we first identified non-overlapping signatures of a small number of lncRNAs that are aberrantly expressed in human HCC compared with paired peritumoral tissues. Then we used real-time PCR to validate five lncRNAs whose expression was altered in HCC compared with paired peritumoral tissues. Using loss-of-function and gain-of-function approaches, we found that an lncRNA (termed lncRNA-HEIH) plays a key role in cell cycle regulation. We further demonstrated that lncRNA-HEIH bound to enhancer of zeste homolog 2 (EZH2) and that this interaction was required for the repression of EZH2 target genes. Together, these results reveal insights into the molecular regulation mechanisms of HCC cell cycle regulation and lead us to propose that lncRNAs may serve as key regulatory hubs in cancer biology.
Project description:The stability of long noncoding RNAs (lncRNAs) and mRNAs in human plasma was identified through expression profiling of genes across different time points (0, 0.5 hour, 1 hour, 2 hours, 4 hours, and 6 hours).
Project description:Long noncoding RNAs (lncRNAs) participate in regulating many biological processes. However, their roles in PDCoV pathogenicity are largely unknown. Here, we analyzed the expression profile of lncRNAs and mRNAs in the PDCoV-infected cells by high-throughput sequencing
Project description:This experiment compared the expression of mRNAs and noncoding RNAs during the development of mouse ovary. The primary aim of the experiment was to identify ncRNAs that were differentially expressed during this process.
Project description:This experiment compared the expression of mRNAs and noncoding RNAs during the development of mouse testis. The primary aim of the experiment was to identify ncRNAs that were differentially expressed during this process.