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Related Concept Videos

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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Pre-Implantation Genetic Testing for Aneuploidy on a Semiconductor Based Next-Generation Sequencing Platform
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Prenatal microarray analysis as second-tier diagnostic test: single-center prospective study.

M Schmid1, S Stary, S Springer

  • 1Department of Obstetrics and Gynecology, Medical University of Vienna, Vienna, Austria.

Ultrasound in Obstetrics & Gynecology : the Official Journal of the International Society of Ultrasound in Obstetrics and Gynecology
|January 8, 2013
PubMed
Summary
This summary is machine-generated.

Chromosomal microarray analysis (CMA) is a valuable second-tier test for prenatal genetic testing in high-risk pregnancies. It improves the detection rate of genetic aberrations, aiding in risk assessment for recurrence.

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Area of Science:

  • Prenatal diagnostics
  • Genetics
  • Medical technology

Background:

  • Prenatal genetic testing is crucial for identifying fetal abnormalities.
  • Karyotyping is a standard but has limitations in detecting submicroscopic genetic variations.

Purpose of the Study:

  • To assess the utility of chromosomal microarray analysis (CMA) as a secondary diagnostic tool in prenatal genetic testing.
  • To determine the added diagnostic value of CMA in high-risk pregnancies with normal or inconclusive karyotypes.

Main Methods:

  • Prospective analysis of 75 high-risk pregnancies undergoing invasive prenatal testing.
  • Application of chromosomal microarray analysis (CMA) following standard karyotyping.
  • Genetic analysis of parental karyotypes when translocations were identified.

Main Results:

  • CMA successfully identified pathological copy-number variations (CNVs) in 14.7% of cases.
  • Submicroscopic rearrangements with clinical significance were detected in 7.5% of cases with normal karyotypes.
  • CMA accurately differentiated true mosaicism from confined or pseudomosaicism.

Conclusions:

  • CMA is a valuable second-tier test for identifying genetic aberrations in high-risk pregnancies.
  • The higher resolution of CMA increases the detection rate of genetic abnormalities.
  • CMA provides clinical benefits for risk assessment and recurrence estimation.