Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion.
<h4>Background</h4>The hybridization of nucleic acid targets with surface-immobilized probes is a widely used assay for the parallel detection of multiple targets in medical and biological research. Despite its widespread application, DNA microarray technology still suffers from several...
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2011-01-01
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| Series: | PLoS ONE |
| Online Access: | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0023727&type=printable |
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| author | Doris Steger David Berry Susanne Haider Matthias Horn Michael Wagner Roman Stocker Alexander Loy |
| author_facet | Doris Steger David Berry Susanne Haider Matthias Horn Michael Wagner Roman Stocker Alexander Loy |
| author_sort | Doris Steger |
| collection | DOAJ |
| description | <h4>Background</h4>The hybridization of nucleic acid targets with surface-immobilized probes is a widely used assay for the parallel detection of multiple targets in medical and biological research. Despite its widespread application, DNA microarray technology still suffers from several biases and lack of reproducibility, stemming in part from an incomplete understanding of the processes governing surface hybridization. In particular, non-random spatial variations within individual microarray hybridizations are often observed, but the mechanisms underpinning this positional bias remain incompletely explained.<h4>Methodology/principal findings</h4>This study identifies and rationalizes a systematic spatial bias in the intensity of surface hybridization, characterized by markedly increased signal intensity of spots located at the boundaries of the spotted areas of the microarray slide. Combining observations from a simplified single-probe block array format with predictions from a mathematical model, the mechanism responsible for this bias is found to be a position-dependent variation in lateral diffusion of target molecules. Numerical simulations reveal a strong influence of microarray well geometry on the spatial bias.<h4>Conclusions</h4>Reciprocal adjustment of the size of the microarray hybridization chamber to the area of surface-bound probes is a simple and effective measure to minimize or eliminate the diffusion-based bias, resulting in increased uniformity and accuracy of quantitative DNA microarray hybridization. |
| format | Article |
| id | doaj-art-da232144e1bb4653adb09ff89d0cfb97 |
| institution | OA Journals |
| issn | 1932-6203 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj-art-da232144e1bb4653adb09ff89d0cfb972025-08-20T02:30:54ZengPublic Library of Science (PLoS)PLoS ONE1932-62032011-01-0168e2372710.1371/journal.pone.0023727Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion.Doris StegerDavid BerrySusanne HaiderMatthias HornMichael WagnerRoman StockerAlexander Loy<h4>Background</h4>The hybridization of nucleic acid targets with surface-immobilized probes is a widely used assay for the parallel detection of multiple targets in medical and biological research. Despite its widespread application, DNA microarray technology still suffers from several biases and lack of reproducibility, stemming in part from an incomplete understanding of the processes governing surface hybridization. In particular, non-random spatial variations within individual microarray hybridizations are often observed, but the mechanisms underpinning this positional bias remain incompletely explained.<h4>Methodology/principal findings</h4>This study identifies and rationalizes a systematic spatial bias in the intensity of surface hybridization, characterized by markedly increased signal intensity of spots located at the boundaries of the spotted areas of the microarray slide. Combining observations from a simplified single-probe block array format with predictions from a mathematical model, the mechanism responsible for this bias is found to be a position-dependent variation in lateral diffusion of target molecules. Numerical simulations reveal a strong influence of microarray well geometry on the spatial bias.<h4>Conclusions</h4>Reciprocal adjustment of the size of the microarray hybridization chamber to the area of surface-bound probes is a simple and effective measure to minimize or eliminate the diffusion-based bias, resulting in increased uniformity and accuracy of quantitative DNA microarray hybridization.https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0023727&type=printable |
| spellingShingle | Doris Steger David Berry Susanne Haider Matthias Horn Michael Wagner Roman Stocker Alexander Loy Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion. PLoS ONE |
| title | Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion. |
| title_full | Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion. |
| title_fullStr | Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion. |
| title_full_unstemmed | Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion. |
| title_short | Systematic spatial bias in DNA microarray hybridization is caused by probe spot position-dependent variability in lateral diffusion. |
| title_sort | systematic spatial bias in dna microarray hybridization is caused by probe spot position dependent variability in lateral diffusion |
| url | https://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0023727&type=printable |
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