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Related Experiment Videos

Design considerations for array CGH to oligonucleotide arrays.

R A Baldocchi1, R J Glynne, K Chin

  • 1University of California at San Francisco Cancer Center, San Francisco, California, USA. russ.baldocchi@dakocytomation.com

Cytometry. Part a : the Journal of the International Society for Analytical Cytology
|September 16, 2005
PubMed
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Designing oligonucleotide arrays to include probes for both sense and antisense strands of PCR amplicons enhances hybridization and signal intensity for accurate DNA copy number and single nucleotide polymorphism analysis.

Area of Science:

  • Genomics
  • Molecular Biology
  • Bioinformatics

Background:

  • Representational oligonucleotide microarray analysis (ROMA) is used for detecting single nucleotide polymorphisms (SNPs) and genome copy number changes.
  • Signal intensity in ROMA is amplified using polymerase chain reaction (PCR)-amplified genomic representations.
  • Current methods face limitations due to insufficient hybridization to certain oligonucleotides, hindering precise genomic analysis.

Purpose of the Study:

  • To investigate factors influencing oligonucleotide hybridization signal intensity in ROMA.
  • To determine the impact of PCR product strand homology and oligonucleotide sequence on hybridization efficiency.

Main Methods:

  • Explored hybridization by pairing multiple PCR-amplified products with oligonucleotide arrays.

Related Experiment Videos

  • Utilized arrays containing two sense and two antisense 50-mer oligonucleotides for each PCR amplicon.
  • Assessed the influence of PCR amplicon strand (sense vs. antisense) and oligonucleotide sequence on hybridization outcomes.

    • Main Results:

    • Hybridization intensity was significantly influenced by the PCR amplicon strand in some instances.
    • In other cases, the specific sequence of the detection oligonucleotide was the dominant factor affecting signal strength.
    • Demonstrated variability in the primary driver of hybridization intensity.

    Conclusions:

    • Oligonucleotide arrays for SNP and copy number analysis should incorporate probes targeting both sense and antisense strands of each PCR amplicon.
    • This dual-strand probe design ensures adequate hybridization and robust signal intensity.
    • Optimized array design is crucial for accurate genomic analysis using ROMA.