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Related Concept Videos

Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

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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...
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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
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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.
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Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
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DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
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Related Experiment Video

Updated: Aug 3, 2025

Infinium Assay for Large-scale SNP Genotyping Applications
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Overview of Genotyping Technologies and Methods.

Ingrid Kockum1, Jesse Huang1, Pernilla Stridh1

  • 1Center for Molecular Medicine, Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden.

Current Protocols
|April 7, 2023
PubMed
Summary

This guide explains genetic studies, covering genotyping methods like PCR, microarrays, and sequencing. It details DNA variant types and their role in diseases, aiding in study design and interpretation.

Keywords:
GWASNGSPCRgeneticsgenotypingmethodologymicroarray

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Area of Science:

  • Molecular biology
  • Genetics

Background:

  • Genotyping technologies have advanced significantly.
  • Genotyping has diverse applications including medical research, forensics, and genealogy.

Purpose of the Study:

  • To provide an overview of genetic studies.
  • To explain key concepts, genotyping methods, and DNA variants.
  • To offer guidance on study design, quality control, and interpretation.

Main Methods:

  • Overview of common genotyping techniques: Polymerase Chain Reaction (PCR), microarrays, and sequencing.
  • Description of the genotyping process from DNA preparation to quality control.
  • Illustration of DNA variant types: mutations, Single Nucleotide Polymorphisms (SNPs), insertions, deletions, microsatellites, and copy number variations.

Main Results:

  • Comparison of different genotyping techniques.
  • Examples of DNA variants and their association with diseases.
  • Discussion of genotyping utilities in medical genetics, Genome-Wide Association Studies (GWAS), and forensic science.

Conclusions:

  • Understanding genotyping is crucial for molecular biology and various research fields.
  • This overview equips readers to design, perform, and critically evaluate genetic studies.
  • Effective quality control and interpretation are essential for reliable genetic research.