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Related Concept Videos

Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

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.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
DNA Microarrays02:34

DNA Microarrays

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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Related Experiment Video

Updated: Jun 2, 2026

Serum and Plasma Copy Number Detection Using Real-time PCR
09:21

Serum and Plasma Copy Number Detection Using Real-time PCR

Published on: December 15, 2017

Performance assessment of copy number microarray platforms using a spike-in experiment.

Eitan Halper-Stromberg1, Laurence Frelin, Ingo Ruczinski

  • 1Department of Biostatistics, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD, USA.

Bioinformatics (Oxford, England)
|April 12, 2011
PubMed
Summary

Copy number variant (CNV) analysis platforms were compared. NimbleGen and Agilent showed higher accuracy, while Illumina and Affymetrix excelled in variant detection using SNP data.

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Area of Science:

  • Genomics
  • Bioinformatics

Background:

  • Copy number variants (CNVs) in chromosomal DNA segments are linked to human variation, diseases, and cancers.
  • Microarray platforms are standard for CNV discovery, serving as a benchmark for new sequence-based methods.
  • Increasing research in CNV analysis necessitates systematic platform evaluations to guide technology choices.

Purpose of the Study:

  • To assess and compare the performance of six different microarray-based platforms for copy number variant detection.
  • To evaluate platform sensitivity, specificity, and accuracy in estimating copy number dosage.

Main Methods:

  • A spike-in experiment was conducted to evaluate sensitivity and specificity.
  • Six platforms from four vendors were tested.
  • Data analysis involved comparing manufacturer-provided pipelines with alternative approaches.

Main Results:

  • NimbleGen and Agilent platforms demonstrated superior accuracy and precision in copy number dosage estimation compared to Illumina and Affymetrix.
  • Illumina and Affymetrix platforms compensated for dosage estimation limitations by effectively utilizing single nucleotide polymorphism (SNP) data for variant detection.
  • The NimbleGen 2.1M platform achieved the best overall performance, contingent on the use of an alternative data analysis pipeline.

Conclusions:

  • Platform choice for CNV analysis depends on specific research needs, balancing dosage accuracy with variant detection capabilities.
  • Alternative data analysis pipelines can significantly enhance the performance of certain platforms.
  • This comparative study provides crucial insights for researchers selecting CNV detection technologies.