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Related Concept Videos

RNA-seq03:21

RNA-seq

RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
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Ribosome Profiling

Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
Cis-acting Elements involved in mRNA stability

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IsoformEx: isoform level gene expression estimation using weighted non-negative least squares from mRNA-Seq data.

Hyunsoo Kim1, Yingtao Bi, Sharmistha Pal

  • 1Center for Systems and Computational Biology, The Wistar Institute, 3601 Spruce Street, Philadelphia, PA 19104-4268, USA.

BMC Bioinformatics
|July 29, 2011
PubMed
Summary

We developed IsoformEx, a novel algorithm for accurate transcript isoform quantification from mRNA sequencing (mRNA-Seq) data. This method improves gene expression analysis by effectively handling complex exon structures.

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Area of Science:

  • Bioinformatics
  • Computational Biology
  • Genomics

Background:

  • Messenger RNA sequencing (mRNA-Seq) is a powerful transcriptomics tool for gene and isoform identification.
  • Accurate quantification of transcript isoform expression from mRNA-Seq data remains challenging due to factors like constitutive exons.

Purpose of the Study:

  • To introduce a novel algorithm, IsoformEx, for precise estimation of transcript isoform expression levels.
  • To address the challenges in isoform quantification posed by complex exon structures in mRNA-Seq data.

Main Methods:

  • Developed IsoformEx, an algorithm utilizing weighted non-negative least squares estimation.
  • Validated the algorithm using in silico mRNA-Seq simulations and real mRNA-Seq data with qRT-PCR experiments.

Main Results:

  • IsoformEx demonstrated accurate estimation of transcript expression levels in simulations and real data.
  • The algorithm showed higher correlation with known expression levels in simulated data compared to existing methods.
  • IsoformEx exhibited superior agreement with qRT-PCR measurements for specific transcripts in real mRNA-Seq data.

Conclusions:

  • IsoformEx provides a fast and accurate method for estimating both transcript and gene expression levels.
  • The algorithm effectively accounts for short and alternative exons through a weighting scheme.
  • The IsoformEx software is publicly available for research use.