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Related Concept Videos

Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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Array Comparative Genomic Hybridization Array CGH for Detection of Genomic Copy Number Variants
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Array comparative genomic hybridisation testing in CHD.

Hannah B Hightower1, Nathaniel H Robin2, Fady M Mikhail2

  • 11Department of Pediatrics,University of Alabama at Birmingham,Birmingham,Alabama,United States of America.

Cardiology in the Young
|October 9, 2014
PubMed
Summary
This summary is machine-generated.

Array comparative genomic hybridization (aCGH) identifies genetic causes of congenital heart defects (CHD). This method reveals a higher incidence of copy number abnormalities in CHD patients compared to karyotyping, particularly in complex cases.

Keywords:
CHDarray comparative genomic hybridisation (aCGH)copy number variants

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Area of Science:

  • Genetics
  • Cardiology
  • Medical Diagnostics

Background:

  • Congenital heart defects (CHD) are a leading cause of infant mortality.
  • Array comparative genomic hybridization (aCGH) detects submicroscopic copy number variations, potentially improving the genetic diagnosis of CHD.

Purpose of the Study:

  • To evaluate the diagnostic yield of aCGH in patients with congenital heart defects (CHD).
  • To compare the detection rate of copy number abnormalities using aCGH versus traditional karyotyping in CHD patients.

Main Methods:

  • Retrospective analysis of 1252 patients, including 173 with CHD, who underwent whole-genome aCGH.
  • Utilized a custom-designed oligonucleotide array with over 44,000 probes to identify copy number changes.

Main Results:

  • Abnormal aCGH results were found in 26.76% of all patients and 28.9% of CHD patients.
  • Higher abnormality rates were observed in specific CHD types, including left-sided heart disease (45.13%) and conotruncal defects (34.48%).
  • aCGH identified copy number changes in CHD patients, including those with known genetic syndromes.

Conclusions:

  • Patients with CHD have a significant risk of microdeletions and microduplications.
  • aCGH demonstrates a higher incidence of abnormalities than karyotyping for identifying the genetic basis of CHD.
  • The diagnostic yield of aCGH may be limited in isolated CHD cases, warranting further research with larger datasets.