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DNA Microarrays02:34

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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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Updated: Apr 7, 2026

Array Comparative Genomic Hybridization Array CGH for Detection of Genomic Copy Number Variants
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[Detection of small supernumerary marker chromosome by single nucleotide polymorphism microarray chips].

Xiaohui Wen, Hong Qi, Jie Ren

    Zhonghua Er Ke Za Zhi = Chinese Journal of Pediatrics
    |July 14, 2015
    PubMed
    Summary

    Single nucleotide polymorphism (SNP) microarray precisely identified small supernumerary marker chromosomes (sSMCs) in newborns. This advanced technique complements traditional karyotyping for diagnosing genetic abnormalities.

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    Area of Science:

    • Genetics
    • Molecular Biology
    • Clinical Diagnostics

    Background:

    • Small supernumerary marker chromosomes (sSMCs) are challenging to characterize using conventional cytogenetic methods.
    • Accurate identification of sSMCs is crucial for understanding genetic disorders and their clinical manifestations.

    Observation:

    • This study utilized single nucleotide polymorphism (SNP) microarray analysis on two newborns with de novo sSMCs.
    • Conventional karyotyping was insufficient to fully delineate the sSMCs in these cases.

    Findings:

    • Newborn A had a 78.6 Mb duplication on chromosome 8 (8p22 duplication syndrome), associated with developmental delays and physical abnormalities.
    • Newborn B had a 32.7 Mb duplication on chromosome 13, with no reported pathogenic significance or observable abnormalities at the time of evaluation.

    Implications:

    • SNP microarray analysis offers high-resolution DNA-level detection of sSMCs in newborns.
    • This method serves as a valuable adjunct to standard karyotyping, improving diagnostic accuracy for complex chromosomal abnormalities.
    • Further research is needed to confirm the pathogenicity of newly identified genetic variations.