A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb. 2006 Analysis of (cDNA) Microarray.

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A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Analysis of (cDNA) Microarray Data: Part II. Intensities versus Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Introduction: Statistical challenges still evident at both level: design & analysis Data quality controls performed at the INT level Analysis: Initial work developed for RAT but can also be accommodate to analyse INT RAT =Red to Green INT =Red & Green Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Objective: Compare RAT and INT in their ability to identify differentially expressed genes Intensities vs Intensity Ratios “It should be noted that there are disadvantages to using only expression ratios for data analysis. Although ratios can help to reveal some patterns in the data, they remove all information about the absolute gene expression levels. Various parameters depend on the measured intensity, including the confidence limits on any microarray measurement.” J Quackenbush, 2001 Nat Rev Gen, 2:418.

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Materials & Methods: EXP1: Diet HighLow Note:- Same microarray used across experiments - Same (basic) criteria for data acquisition - Equivalent models for data analysis across experiments and for both RAT and INT EXP2: Breed HolsteinJap Black Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Materials & Methods:

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb INT =Array|Block|Dye|Trt (Gene) 4,785 4,991 +Gene*Trt 9,570 9,982 +Residual39,654 42,130 RAT =Array|Block|Trt_contrast (Gene) 4,785 4,991 +Gene*Trt_contrast 9,570 9,982 +Residual19,827 21,065 EXP1 (Diets) EXP2 (Breeds) Materials & Methods: Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb EXP1 (Diets) EXP2 (Breeds) RAT INT μ = –0.02 σ = 0.89 μ = –0.08 σ = 0.66 μ = σ = 2.01 μ = 9.53 σ = 2.03 Materials & Methods: Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb EXP1 (Diets) EXP2 (Breeds) RAT INT Array 1 = 0.17 (0.87) Array 2 = (0.87) Var(Tot) = 0.75 % GxT = 92 Array 1 = (0.67) Array 2 = (0.65) Var(Tot) = 0.37 % GxT = 77 Array 1= (1.64) Array 2= 9.96 (2.21) Red = (2.12) Green= (1.89) Var(Tot) = 3.73 % GxT = 76 Array 1= 9.43 (2.09) Array 2= 9.64 (1.95) Red = 9.49 (2.06) Green= 9.58 (2.00) Var(Tot) = 3.96 % GxT = 76 Results & Discussions: Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb EXP1 (Diets) EXP2 (Breeds) RAT INT RAT r = 0.969r = Results & Discussions: Rank Comparison Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb REDGREEN Low Diet High Diet INT is more Robust than RAT to Dye x Treatment ? Similar but non-significant trend for the other elements Discrepancies at the most extreme 50 elements (EXP1) Gene in the top 50 with INT Rank when analysing Gene in the top 50 with RAT Rank when analysing INTRAT INTRAT CCL CCL CCL CCL CCL CCL Results & Discussions: Discrepancies Intensities vs Intensity Ratios

A Quantitative Overview to Gene Expression Profiling in Animal Genetics Armidale Animal Breeding Summer Course, UNE, Feb Strong to very strong similarities between INT and RAT in their ability to ranking genes Possible evidence for better control of: Overall Variation using RAT Dye x Treatment using INT Further research is required (more arrays, samples, …) Initial concerns still hold: RAT requires good signal on both channels Not clear which RAT to use if > 2 Treatments Conclusions: Intensities vs Intensity Ratios