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Related Experiment Videos

Array-based comparative genome hybridization in clinical genetics.

Anat Bar-Shira1, Guy Rosner, Serena Rosner

  • 1Genetic Institute, Tel Aviv Sourasky Medical Center, Tel Aviv 64239, Israel.

Pediatric Research
|July 22, 2006
PubMed
Summary

Array comparative genomic hybridization (array-CGH) effectively detects submicroscopic chromosomal abnormalities in patients with multiple anomaly syndromes and mental retardation. This high-resolution technology aids in diagnosing genetic disorders and improving patient care.

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Area of Science:

  • Genetics
  • Genomics
  • Molecular Biology

Background:

  • Abnormalities in DNA copy number are common in multiple anomaly syndromes and mental retardation.
  • Submicroscopic chromosomal aberrations underlie many of these genetic disorders.
  • High-resolution whole-genome technologies are crucial for detecting these subtle genetic changes.

Observation:

  • Eight patients with mental disability, multiple congenital anomalies, and dysmorphic features were evaluated using the GenoSensor Array 300 Chip.
  • Array-CGH confirmed subtelomeric aberrations in two patients and provided diagnoses in two complex cases.
  • Specific microdeletions (15q11.2-q13, 22q11.2) and a borderline false-negative WT1 deletion were identified, with high per-patient false-positive rates noted.

Findings:

  • Array-CGH accurately detects submicroscopic chromosomal imbalances, aiding in the diagnosis of genetic disorders.

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  • The technology confirmed previously identified aberrations and identified new ones, including microdeletions.
  • Discrepancies between array-CGH and FISH were minimal, though probe size influenced WT1 deletion detection.

    • Implications:

    • Array-CGH is a powerful tool for rapid and accurate detection of genetic disorders associated with copy number abnormalities.
    • This technology can significantly improve clinical genetic diagnosis and patient care.
    • Further refinement of microarray probes may enhance detection accuracy for specific deletions.