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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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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
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Rapid screening for chromosomal aneuploidies using array-MLPA.

Jing-Bin Yan1, Miao Xu, Can Xiong

  • 1Institute of Medical Genetics, Children's Hospital of Shanghai, Shanghai Jiao Tong University, Shanghai, P.R. China.

BMC Medical Genetics
|May 18, 2011
PubMed
Summary
This summary is machine-generated.

Array-based MLPA offers rapid and sensitive screening for fetal chromosomal aneuploidies, improving upon traditional methods for prenatal genetic testing. This new technique accurately identifies common trisomies and sex chromosome abnormalities.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Bioinformatics

Background:

  • Chromosome abnormalities, including trisomies 21, 13, 18, and sex chromosome aneuploidies, are significant causes of pregnancy loss.
  • Traditional methods like karyotype analysis and FISH are reliable but time-consuming, with results typically available after 3-4 days.
  • Conventional multiplex ligation-dependent probe amplification (MLPA) has limitations in detecting mosaic trisomy and quantifying numerous targets simultaneously.

Purpose of the Study:

  • To develop and evaluate a rapid, sensitive array-based MLPA method for screening common fetal aneuploidies.
  • To overcome the limitations of conventional MLPA for prenatal genetic screening.

Main Methods:

  • Developed an array-based MLPA technique utilizing 116 universal tag-probes for chromosomes 13, 18, 21, X, Y, and control genes.
  • Hybridized MLPA products onto a 4-well flow-through microarray system.
  • Determined chromosome copy numbers by analyzing relative signal intensities from chromosome-specific probes.

Main Results:

  • Array-MLPA correctly identified 97.7% (169/173) of samples in a blind study, including all amniotic fluid samples.
  • Successfully detected two cases of chromosome X monosomy mosaicism, with estimated mosaicism rates consistent with karyotyping.
  • Identified five Y chromosome abnormalities, with four cases where G-banding could not determine the origin.

Conclusions:

  • Array-MLPA demonstrates significant potential for rapid and sensitive chromosomal aneuploidy screening in clinical diagnosis and prenatal testing.
  • The developed procedure offers a simple and rapid method for screening copy numbers of key chromosomes (13, 18, 21, X, Y).