title: Application of hybridization control probe to increase accuracy on ligation detection or minisequencing diagnostic microarrays.
abstract: BACKGROUND
  Nucleic acid detection based on ligation reaction or single nucleotide extension of ssDNA probes followed by tag microarray hybridization provides an accurate and sensitive detection tool for various diagnostic purposes. Since microarray quality is crucial for reliable detection, these methods can benefit from correcting for microarray artefacts using specifically adapted techniques.
  
  
  RESULTS
  Here we demonstrate the application of a per-spot hybridization control oligonucleotide probe and a novel way of computing normalization for tag array data. The method takes into account the absolute value of the detection probe signal and the variability in the control probe signal to significantly alleviate problems caused by artefacts and noise on low quality microarrays.
  
  
  CONCLUSIONS
  Diagnostic microarray platforms require experimental and computational tools to enable efficient correction of array artefacts. The techniques presented here improve the signal to noise ratio and help in determining true positives with better statistical significance and in allowing the use of arrays with poor quality that would otherwise be discarded.
authors.affiliation: DNA sequencing and genomics laboratory, Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland. jarmo.ritari@helsinki.fi.
authors.forename: Jarmo
authors.initials: J
authors.lastname: Ritari
authors.forename: Lars
authors.initials: L
authors.lastname: Paulin
authors.forename: Jenni
authors.initials: J
authors.lastname: Hultman
authors.forename: Petri
authors.initials: P
authors.lastname: Auvinen