Effects of Sequence Mismatches on Microarray Signal Ratios
Author Information
Author(s): Catriona Rennie, Harry A. Noyes, Stephen J. Kemp, Helen Hulme, Andy Brass, David C. Hoyle
Primary Institution: University of Liverpool and University of Manchester
Hypothesis
How do sequence mismatches affect the stability of probe-target duplexes in microarray hybridizations?
Conclusion
Short sequence mismatches significantly impact microarray hybridization intensities, especially depending on their position within the probe.
Supporting Evidence
- The study found that the position of mismatches significantly affects signal intensity.
- Length of perfect match explained 43% of the variance in signal ratios.
- Known mismatches were associated with high positive mean log2 signal ratios.
Takeaway
When using DNA microarrays, small mistakes in the DNA sequence can change how well the test works, especially if those mistakes are in the middle of the DNA strand.
Methodology
The study involved competitive hybridizations using dye-flip replicates for three inbred mouse strains against a reference strain on Agilent CGH arrays.
Potential Biases
Potential bias from unaccounted SNPs and random noise in signal measurements.
Limitations
The study may not account for all possible sequence variations due to missing data on SNPs and indels.
Participant Demographics
Three inbred mouse strains: 129P3/J, A/J, and BALB/cJ.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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