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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...
Tagging and Fusion Proteins01:24

Tagging and Fusion Proteins

Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...
Ribosome Profiling02:24

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.
Applications of ribosome profiling
Ribosome profiling has many applications, including in vivo monitoring of translation inside a particular organ or tissue type and quantifying new protein synthesis levels.
The technique helps...
Multi-species Conserved Sequences02:51

Multi-species Conserved Sequences

Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale  studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
Next-generation Sequencing03:00

Next-generation Sequencing

The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.

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Updated: Jun 24, 2026

3' End Sequencing Library Preparation with A-seq2
12:01

3' End Sequencing Library Preparation with A-seq2

Published on: October 10, 2017

Expressed sequence tags: an overview.

John Parkinson1, Mark Blaxter

  • 1Molecular Structure and Function, Hospital for Sick Children, Toronto, ON, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|March 12, 2009
PubMed
Summary
This summary is machine-generated.

Expressed sequence tags (ESTs) are valuable gene discovery tools. This volume details EST generation and analysis, highlighting their expanding applications in phylogenetics and transcript profiling.

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Targeted RNA Sequencing Assay to Characterize Gene Expression and Genomic Alterations

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Area of Science:

  • Molecular Biology
  • Bioinformatics
  • Genomics

Background:

  • Expressed sequence tags (ESTs) are partial mRNA sequences from cDNA libraries.
  • Over 45 million ESTs from 1400+ eukaryotic species have been generated.
  • ESTs traditionally aid genome projects and gene discovery.

Purpose of the Study:

  • To provide practical details on EST generation and analysis.
  • To explore emerging applications of ESTs.
  • To serve as a guide for researchers in the field.

Main Methods:

  • Creation of complementary DNA (cDNA) libraries.
  • Generation and processing of sequence data.
  • Bioinformatics analysis of ESTs.

Main Results:

  • ESTs are increasingly used beyond gene discovery.
  • Applications now include phylogenetics and transcript profiling.
  • Proteomics is an emerging application area for ESTs.

Conclusions:

  • ESTs are versatile tools with growing applications.
  • Accurate and comprehensive EST data enables new research avenues.
  • This volume offers a comprehensive guide to EST methodology and utility.