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Related Concept Videos

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

Published on: February 21, 2015

A systematic analysis of small supernumerary marker chromosomes using array CGH exposes unexpected complexity.

Kavita S Reddy1, Swaroop Aradhya, Jeanne Meck

  • 1Medical Genetics and Genomics Laboratory, Kaiser Permanente Southern California, Los Angeles, California, USA. kavita.reddy@gmail.com

Genetics in Medicine : Official Journal of the American College of Medical Genetics
|September 1, 2012
PubMed
Summary

Small supernumerary marker chromosomes (sSMCs) are often complex, with whole-genome array-based comparative genomic hybridization revealing unexpected findings in most cases. This detailed characterization aids in understanding genotype-phenotype correlations and genetic counseling for developmental disorders.

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Area of Science:

  • Genetics
  • Genomic Medicine
  • Developmental Biology

Background:

  • Small supernumerary marker chromosomes (sSMCs) are frequently observed in individuals with developmental disorders.
  • Traditional methods often limit comprehensive characterization of sSMCs, hindering precise genotype-phenotype correlations.
  • Advanced genomic techniques are crucial for fully understanding the complexity of sSMCs.

Purpose of the Study:

  • To fully characterize de novo small supernumerary marker chromosomes using comprehensive genomic analysis.
  • To establish accurate genotype-phenotype correlations for sSMC cases.
  • To evaluate the utility of whole-genome array-based comparative genomic hybridization (aCGH) in characterizing sSMCs.

Main Methods:

  • Systematic genotyping of ten de novo sSMC cases.
  • Utilized G-banding, C-banding, AgNOR staining, whole-genome aCGH, and fluorescence in situ hybridization (FISH).
  • Genome-wide analysis to ensure complete characterization of marker chromosomes.

Main Results:

  • Whole-genome aCGH identified complex rearrangements in 50% of sSMC cases.
  • 40% of sSMCs were missed by aCGH due to low-level mosaicism or lack of euchromatin.
  • Identified unusual marker compositions, including derivative acrocentric chromosomes and rearrangements involving noncontiguous segments.

Conclusions:

  • Small supernumerary marker chromosomes are frequently more complex than initially apparent.
  • Whole-genome aCGH is essential for accurate characterization of sSMCs, improving genotype-phenotype correlation.
  • Comprehensive characterization of sSMCs using advanced genomic methods facilitates informed genetic counseling.