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The methylotrophic yeast Hansenula polymorphahas been extensively studied as a model organism for methanolmetabolism and peroxisome biogenesis. Recently, this yeasthas also attracted attention as a promising host organismfor recombinant protein production. Here, we describe thefabrication and evaluation of a DNA chip spotted with 382open reading frames (ORFs) of H. polymorpha. Each ORFwas PCR-amplified using gene-specific primer sets, of whichthe forward primers had 5'-aminolink. The PCR productswere printed in duplicate onto the aldehyde-coated slideglasses to link only the coding strands to the surface of theslide via covalent coupling between amine and aldehyde groups.With the partial genome DNA chip, we compared efficiencyof direct and indirect cDNA target labeling methods, and foundthat the indirect method, using fluorescent-labeled dendrimers,generated a higher hybridization signal-to-noise ratio than thedirect method, using cDNA targets labeled by incorporationof fluorescence-labeled nucleotides during reverse transcription.In addition, to assess the quality of this DNA chip, weanalyzed the expression profiles of H. polymorpha cellsgrown on different carbon sources, such as glucose andmethanol, and also those of cells treated with the superoxidegeneratingdrug, menadione. The profiles obtained showed ahigh-level induction of a set of ORFs involved in methanolmetabolism and oxidative stress response in the presence ofmethanol and menadione, respectively. The results demonstratethe sensitivity and reliability of our arrays to analyze globalgene expression changes of H. polymorpha under definedenvironmental conditions.

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