objective: hepatitis c virus is the major cause of viral hepatitis and its diagnosis in suspected specimens is of great importance. the risk of transfusion- transmitted virus infection is primarily the result of failure in serological screening tests to detect recently infected donors in the pre-seroconversion window period of infection. therefore, sensitive and accurate diagnosis of hcv prior ...

Satellite tobacco necrosis virus RNA (STNV RNA) is a naturally uncapped viral RNA that contains 1239 nucleotides: 29 in the 5' untranslated region (UTR), 591 in the coding region and 619 in the 3' UTR. Mutations were made in the 5' and 3' UTRs, and the effects of these mutations on translational efficiency and cap independence were measured in an in vitro translation system from wheat germ. Rem...

The positive-strand RNA genome of the hepatitis C virus (HCV) is flanked by 5'- and 3'-untranslated regions (UTRs). Translation of the viral RNA is directed by the internal ribosome entry site (IRES) in the 5'-UTR, and subsequent viral RNA replication requires sequences in the 3'-UTR and in the 5'-UTR. Addressing previous conflicting reports on a possible function of the 3'-UTR for RNA translat...

For a number of human genes that encode transcripts containing inverted repeat Alu elements (IRAlus) within their 3' untranslated region (UTR), product mRNA is efficiently exported to the cytoplasm when the IRAlus, which mediate nuclear retention, are removed by alternative polyadenylation. Here we report a new mechanism that promotes gene expression by targeting mRNAs that maintain their 3' UT...

Human Long interspersed element-1 (L1) retrotransposons contain an internal RNA polymerase II promoter within their 5' untranslated region (UTR) and encode two proteins, (ORF1p and ORF2p) required for their mobilization (i.e., retrotransposition). The evolutionary success of L1 relies on the continuous retrotransposition of full-length L1 mRNAs. Previous studies identified functional splice don...

Retrotransposon L1 is a mobile genetic element of the LINE family that is extremely widespread in the mammalian genome. It encodes a dicistronic mRNA, which is exceptionally rare among eukaryotic cellular mRNAs. The extremely long and GC-rich L1 5' untranslated region (5'UTR) directs synthesis of numerous copies of RNA-binding protein ORF1p per mRNA. One could suggest that the 5'UTR of L1 mRNA ...

Nonsense-mediated mRNA decay (NMD), which degrades transcripts harboring a premature termination codon (PTC), depends on the helicase up-frameshift 1 (UPF1). However, mRNAs that are not NMD targets also bind UPF1. What governs the timing, position, and function of UPF1 binding to mRNAs remains unclear. We provide evidence that (i) multiple UPF1 molecules accumulate on the 3'-untranslated region...

The sequences of the untranslated regions (UTRs) of mRNAs play important roles in posttranscriptional regulation, but whether a change in UTR length can significantly affect the regulation of gene expression is not clear. In this study, we examined the connection between UTR length and Expression Correlation with cytosolic ribosomal proteins (CRP) genes (ECC), which measures the level of expres...

AML1/RUNX1 belongs to the runt domain transcription factors that are important regulators of hematopoiesis and osteogenesis. Expression of AML1 is regulated at the level of transcription by two promoters, distal (D) and proximal (P), that give rise to mRNAs bearing two distinct 5' untranslated regions (5'UTRs) (D-UTR and P-UTR). Here we show that these 5'UTRs act as translation regulators in vi...

Abstract Background Breast cancer 2, early onset ( BRCA2 ) is a tumor suppressor gene. The protein encoded by this gene plays an important role in homologous recombination (HR)-mediated DNA repair. Deleterious mutations and downregulation of its expression have been associated with tumorigenesis dogs humans. Thus, regulation level for maintaining homeostasis recombination. Results In study, the...