نتایج جستجو برای: Pre-miRNA

تعداد نتایج: 332808  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم پایه 1392

زمینه و هدف : microrna ها خانواده بزرگی متشکل از rna های کوچک غیرکدکننده هستند که تقریبا¬21 نوکلئوتید طول داشته و به عنوان کلید اصلی تنظیمات پس¬رونوشتی بیان ژن¬ها در جانوران عالی، گیاهان و تک یاخته¬ها مطرح می¬باشند. در بیشتر پستانداران mirna ها به¬وسیله¬یrna polymerase ii رونویسی می¬شوند و سپس طی دو سری پردازش (یکی در هسته و دیگری در سیتوپلاسم) بالغ شده و بهmirna عملکردی تبدیل می شوند. مرحله پ...

2013
Lin Gan Bernd Denecke

It came to our attention that a paper has recently been published concerning one of the GEO datasets (GSE34413) we cited in our published paper [1]. The original reference (reference 27) cited for this dataset leads to a paper about a similar study from the same research group [2]. In order to provide readers with exact citation information, we would like to update reference 27 in our previous ...

2012
A. Maxwell Burroughs Mitsuoki Kawano Yoshinari Ando Carsten O. Daub Yoshihide Hayashizaki

Recent research hints at an underappreciated complexity in pre-miRNA processing and regulation. Global profiling of pre-miRNA and its potential to increase understanding of the pre-miRNA landscape is impeded by overlap with highly expressed classes of other non coding (nc) RNA. Here, we present a data set excluding these RNA before sequencing through locked nucleic acids (LNA), greatly increasi...

Journal: :PLoS ONE 2008
Gwen Liu Hyeyoung Min Sibiao Yue Chang-Zheng Chen

BACKGROUND Mature miRNAs can often be classified into large families, consisting of members with identical seeds (nucleotides 2 through 7 of the mature miRNAs) and highly homologous approximately 21-nucleotide (nt) mature miRNA sequences. However, it is unclear whether members of a miRNA gene family, which encode identical or nearly identical mature miRNAs, are functionally interchangeable in v...

Journal: :Cell 2007
Sven Diederichs Daniel A. Haber

MicroRNAs are small endogenous noncoding RNAs involved in posttranscriptional gene regulation. During microRNA biogenesis, Drosha and Dicer process the primary transcript (pri-miRNA) through a precursor hairpin (pre-miRNA) to the mature miRNA. The miRNA is incorporated into the RNA-Induced Silencing Complex (RISC) with Argonaute proteins, the effector molecules in RNA interference (RNAi). Here,...

Journal: :Blood 2008
Andrea J O'Hara Wolfgang Vahrson Dirk P Dittmer

MicroRNAs are regulated by gene alteration, transcription, and processing. Thus far, few studies have simultaneously assessed all 3 levels of regulation. Using real-time quantitative polymerase chain reaction (QPCR)-based arrays, we determined changes in gene copy number, pre-miRNA, and mature miRNA levels for the largest set of primary effusion lymphomas (PELs) to date. We detected PEL-specifi...

2009
Andrea J. O’Hara Dirk P. Dittmer Shawn Ahmed Blossom Damania Morgan Giddings Ronald I. Swanstrom William F. Marzluff Andrea O’Hara

MicroRNAs are regulated by gene alteration, transcription, and processing. Thus far, few studies have simultaneously assessed all 3 levels of regulation. Using real-time quantitative polymerase chain reaction (QPCR)–based arrays, we determined changes in gene copy number, pre-miRNA, and mature miRNA levels for the largest set of primary effusion lymphomas (PELs) to date. We detected PELspecific...

2011
Li Guo Tingming Liang Wanjun Gu Yuming Xu Yunfei Bai Zuhong Lu

MicroRNAs (miRNAs) have important roles in various biological processes. miRNA cross-mapping is a prevalent phenomenon where miRNA sequence originating from one genomic region is mapped to another location. To have a better understanding of this phenomenon in the human genome, we performed a detailed analysis in this paper using public miRNA high-throughput sequencing data and all known human m...

Journal: :Molecular cell 2013
Ze'ev Melamed Asaf Levy Reut Ashwal-Fluss Galit Lev-Maor Keren Mekahel Nir Atias Shlomit Gilad Roded Sharan Carmit Levy Sebastian Kadener Gil Ast

The initial step in microRNA (miRNA) biogenesis requires processing of the precursor miRNA (pre-miRNA) from a longer primary transcript. Many pre-miRNAs originate from introns, and both a mature miRNA and a spliced RNA can be generated from the same transcription unit. We have identified a mechanism in which RNA splicing negatively regulates the processing of pre-miRNAs that overlap exon-intron...

2013
Mickael Leclercq Abdoulaye Banire Diallo Mathieu Blanchette

MicroRNAs (miRNAs) are short RNA species derived from hairpin-forming miRNA precursors (pre-miRNA) and acting as key posttranscriptional regulators. Most computational tools labeled as miRNA predictors are in fact pre-miRNA predictors and provide no information about the putative miRNA location within the pre-miRNA. Sequence and structural features that determine the location of the miRNA, and ...

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