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Related Concept Videos

EDTA: Auxiliary Complexing Reagents01:26

EDTA: Auxiliary Complexing Reagents

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EDTA titrations are usually carried out in highly basic conditions, where the fully deprotonated form of EDTA, Y4−, actively complexes with the free metal ions in the solution. Several metal ions precipitate as hydrous oxide (hydroxides, oxides, or oxyhydroxides) under these conditions, lowering the concentration of free metal ions in the solution. For this reason, auxiliary complexing agents or ligands such as ammonia, tartrate, citrate, or triethanolamine are used in EDTA titrations to...
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Effects of EDTA on End-Point Detection Methods01:18

Effects of EDTA on End-Point Detection Methods

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Different methods, such as visual observance of metal-ion indicators, spectroscopic techniques, and potentiometric methods, can determine the endpoint of an EDTA titration.
In the visual method, metal-ion indicators (metallochromic dyes), which have distinct colors in their free and complex forms, are added to the mixture to signal the titration's end point. They form stable complexes with metal ions, but these complexes are weaker than the corresponding metal–EDTA complexes. As a...
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EDTA: Direct, Back-, and Displacement Titration01:30

EDTA: Direct, Back-, and Displacement Titration

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The EDTA titration types for metal ion analysis include direct titration, back-titration, and replacement titration.
Direct titration involves buffering the metal ion solution to the desired pH and directly titrating with standard EDTA until the endpoint. The optimum pH ensures a large conditional formation constant of metal−EDTA and visibility of the free indicator color in the solution. In addition, auxiliary complexing reagents are used to prevent the precipitation of metal hydroxides...
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EDTA: Indirect and Alkalimetric Titration01:23

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Unlike direct titration, back-titration, and displacement titration, indirect titration is an EDTA titration method for quantifying anions. In the indirect titration method, anions are precipitated as their insoluble salts with excess metal ions. The filtrate containing the excess metal ions is directly titrated with standard EDTA until the endpoint is achieved. Another approach involves extracting the metal ion and back-titrating with standard EDTA to obtain the endpoint. In this way, the...
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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Genome Annotation and Assembly03:36

Genome Annotation and Assembly

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The genome refers to all of the genetic material in an organism. It can range from a few million base pairs in microbial cells to several billion base pairs in many eukaryotic organisms. Genome assembly refers to the process of taking the DNA sequencing data and putting it all back together in a correct order to create a close representation of the original genome. This is followed by the identification of functional elements on the newly assembled genome, a process called genome annotation.
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A Tutorial of EDTA: Extensive De Novo TE Annotator.

Weijia Su1, Shujun Ou2, Matthew B Hufford2

  • 1Department of Genetics, Development and Cell Biology, Iowa State University, Ames, IA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|April 26, 2021
PubMed
Summary

Transposable elements (TEs) are key to genome evolution. EDTA (Extensive de novo TE Annotator) is a new pipeline that accurately identifies and annotates all TE types, improving genomic analysis.

Keywords:
De novo TE identificationTE annotationTE computational pipelineTransposable elements

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Area of Science:

  • Genomics
  • Bioinformatics
  • Molecular Evolution

Background:

  • Transposable elements (TEs) significantly influence genome structure and evolution.
  • Numerous computational tools exist for TE identification and annotation, utilizing homology-based, structural-based, or de novo approaches.
  • Each existing method presents unique advantages and limitations.

Purpose of the Study:

  • To introduce EDTA (Extensive de novo TE Annotator), a comprehensive computational pipeline for identifying and annotating all types of transposable elements.
  • To present an overview of the EDTA pipeline and provide a detailed user manual.
  • To make the EDTA source code publicly available for broader research application.

Main Methods:

  • EDTA integrates high-quality tools selected based on benchmarking results of various TE annotation methods.
  • The pipeline's development prioritized tools demonstrating high accuracy in identifying true TEs and minimizing false positives.
  • The approach combines multiple strategies for robust and comprehensive TE detection.

Main Results:

  • EDTA offers a unified pipeline for the identification and annotation of diverse transposable elements.
  • The pipeline is designed for high accuracy, effectively distinguishing genuine TEs from non-TE sequences.
  • Benchmarking confirmed the effectiveness of the selected tools integrated within EDTA.

Conclusions:

  • EDTA provides a powerful and reliable solution for transposable element annotation in genomic studies.
  • The pipeline enhances the accuracy and comprehensiveness of TE identification, aiding genome structure and evolution research.
  • Availability of the EDTA source code facilitates its adoption and further development in the scientific community.