A comparison of oligonucleotide and cDNA-based microarray systems.
Large-scale public data mining will become more common as public release of microarray data sets becomes a corequisite for publication. Therefore, there is an urgent need to clarify whether data from different microarray platforms are comparable. To assess the compatibility of microarray data, results were compared from the two main types of high-throughput microarray expression technologies, namely, an oligonucleotide-based and a cDNA-based platform, using RNA obtained from complex tissue (human colonic mucosa) of five individuals. From 715 sequence-verified genes represented on both platforms, 64% of the genes matched in "present" or "absent" calls made by both platforms. Calls were influenced by spurious signals caused by Alu repeats in cDNA clones, clone annotation errors, or matched probes that were designed to different regions of the gene; however, these factors could not completely account for the level of call discordance observed. Expression levels in sequence-verified, platform-overlapping genes were not related, as demonstrated by weakly positive rank order correlation. This study demonstrates that there is only moderate overlap in the results from the two array systems. This fact should be carefully considered when performing large-scale analyses on data originating from different microarray platforms.
Mah
Nancy
N
First Department of Medicine, Christian-Albrechts-University Kiel, D-24105 Kiel, Germany.
Thelin
Anders
A
Lu
Tim
T
Nikolaus
Susanna
S
Kühbacher
Tanja
T
Gurbuz
Yesim
Y
Eickhoff
Holger
H
Klöppel
Günther
G
Lehrach
Hans
H
Mellgård
Björn
B
Costello
Christine M
CM
Schreiber
Stefan
S
D000368:Aged; D020087:Alu Elements / Q000235:genetics; D001706:Biopsy; D003106:Colon / Q000378:metabolism; D018076:DNA, Complementary / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling / Q000295:instrumentation / Q000379:methods; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D020411:Oligonucleotide Array Sequence Analysis / Q000295:instrumentation* / Q000379:methods*; D009841:Oligonucleotides / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis / Q000235:genetics; D015203:Reproducibility of Results
D018076:DNA, Complementary; D009841:Oligonucleotides; D012333:RNA, Messenger