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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제34권 제3호
발행연도
2002.1
수록면
224 - 232 (9page)

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Normalization of the data of cDNA microaray is anobligatory step during microarray experiments dueto the relatively frequent non-specific erors. Gener-ally, normalization of microaray data is based onthe null hypothesis and variance model. In theYangs model (Yang et al., 2001), at least two types ofnoises are included. The one is additive noise andthe other is multiplicative noise. Usually, backgroundis considered as one of additive noise to the signaland the variation between the signal pixels is therepresentative multiplicative noise. In this study, therelation between the signal (spot intensity minusbackground intensity) and background was observedand the influence of background on normalizationas a representative additive factor was investigated.Although the relation has not been considered as afactor affecting the normalization, it could improvethe accuracy of microaray data when the normaliza-tion was carried out considering signal/backgroundratio. The background dependent normalization de-creased the number of genes whose expression lev-els were changed significantly and it could maketheir distribution more consistent through the wholerange of signal intensities. In this study, printing pindependent normalization was also carried outregarding the printing pin as a representative multi-plicative noise. It improved the distribution of spotsin the Cy3-Cy5 scatter plot, but its effect was slight.These studies suggest that there are some influ-ences of the signals on the local backgrounds andthey must be considered for the normalization ofcDNA microarray data.

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