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Karyotyping01:17

Karyotyping

Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...

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Related Experiment Video

Updated: Jun 15, 2026

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
09:16

Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants

Published on: February 21, 2015

Improved structural characterization of chromosomal breakpoints using high resolution custom array-CGH.

A Lindstrand1, J Schoumans, P Gustavsson

  • 1Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden. anna.lindstrand@ki.se

Clinical Genetics
|March 19, 2010
PubMed
Summary
This summary is machine-generated.

Targeted custom arrays enhance genomic imbalance detection. This method refines breakpoint characterization, revealing small deletions and duplications in rearrangements, aiding disease gene discovery.

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Related Experiment Videos

Last Updated: Jun 15, 2026

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cytogenetics

Background:

  • Array comparative genomic hybridization (Array-CGH) is crucial for detecting genomic imbalances.
  • Customizing arrays improves resolution for targeted genomic regions and breakpoint structure analysis.
  • Detecting very small imbalances is essential for accurate genetic diagnosis.

Purpose of the Study:

  • To evaluate the efficacy of targeted custom arrays for high-resolution characterization of chromosomal breakpoints.
  • To refine the analysis of deletions and duplications at breakpoints in patients with balanced and unbalanced rearrangements.
  • To investigate the potential of these arrays in identifying novel disease-causing genes associated with subtle genomic alterations.

Main Methods:

  • Utilized targeted custom oligonucleotide arrays to analyze 38 chromosomal breakpoints from 12 patients.
  • Characterized unbalanced breakpoints, with resolution ranging from 17-20,000 bp.
  • Investigated deletions and duplications, including a 200 bp deletion within a FISH-defined breakpoint and an 11 Mb deletion on an unrelated chromosome.

Main Results:

  • Achieved high-resolution fine mapping of breakpoints, significantly exceeding standard array platforms.
  • Successfully refined all deletion and duplication breakpoints, providing insights into their formation mechanisms.
  • Identified a small deletion in a carrier of a balanced translocation and a large deletion in an apparently unrelated chromosome.

Conclusions:

  • Targeted custom arrays offer superior resolution for breakpoint fine mapping compared to commercial platforms.
  • This approach can uncover cryptic imbalances in apparently balanced rearrangements, potentially revealing new disease genes.
  • The high accuracy in breakpoint characterization aids in understanding genomic rearrangement mechanisms and their clinical relevance.