Improving gene quantification by adjustable spot-image restoration

 
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Improving gene quantification by adjustable spot-image restoration (EN)

Δασκαλάκης, Αντώνης (EL)
Μπουγιούκος, Παναγιώτης (EL)
Κάβουρας, Διονύσης Α. (EL)
Γκλώτσος, Δημήτριος (EL)
Κωστόπουλος, Σπυρίδων (EL)

Νικηφορίδης, Γεώργιος Σ. (EL)
Αργυρόπουλος, Χρήστος (EL)
Τ.Ε.Ι. Αθήνας. Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Μηχανικών Βιοϊατρικής Τεχνολογίας Τ.Ε. (EL)
Καλατζής, Ιωάννης (EL)
Καγκάδης, Γεώργιος Χ. (EL)

Motivation: One of the major factors that complicate the task of microarray image analysis is that microarray images are distorted by various types of noise. In this study a robust framework is proposed, designed to take into account the effect of noise in microarray images in order to assist the demanding task of microarray image analysis. The proposed framework, incorporates in the microarray image processing pipeline a novel combination of spot adjustable image analysis and processing techniques and consists of the following stages: (1) gridding for facilitating spot identification, (2) clustering (unsupervised discrimination between spot and background pixels) applied to spot image for automatic local noise assessment, (3) modeling of local image restoration process for spot image conditioning (adjustable wiener restoration using an empirically determined degradation function), (4) automatic spot segmentation employing seeded-region-growing, (5) intensity extraction and (6) assessment of the reproducibility (real data) and the validity (simulated data) of the extracted gene expression levels. Results: Both simulated and real microarray images were employed in order to assess the performance of the proposed framework against well-established methods implemented in publicly available software packages (Scanalyze and SPOT). Regarding simulated images, the novel combination of techniques, introduced in the proposed framework, rendered the detection of spot areas and the extraction of spot intensities more accurate. Furthermore, on real images the proposed framework proved of better stability across replicates. Results indicate that the proposed framework improves spots’ segmentation and, consequently, quantification of gene expression levels. Availability: All algorithms were implemented in Matlab™ (The Mathworks, Inc., Natick, MA, USA) environment. The codes that implement microarray gridding, adaptive spot restoration and segmentation/intensity extraction are available upon request. Supplementary results and the simulated microarray images used in this study are available for download from: ftp://users:bioinformatics@mipa.med.upatras.gr (EN)

journalArticle

Microarray images (EN)
Image analysis (EN)
Εικόνες μικροσυστοιχιών (EN)
Ανάλυση εικόνας (EN)

ΤΕΙ Αθήνας (EL)
Technological Educational Institute of Athens (EN)

Bioinformatics (EN)

Αγγλική γλώσσα

2007

doi: 10.1093/bioinformatics/btm337

Oxford University Press (EN)



*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.