備忘錄
投影片放映
大綱
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"Cells are different because of..."
  • Cells are different because of differential gene expression.
  • About 40% of human genes are expressed at one time.
  • Gene is expressed by transcribing DNA into single-stranded mRNA.
  • mRNA is later translated into a protein.
  • Microarrays measure the level of mRNA expression.
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"Biological discovery"
  • Biological discovery
    • new and better molecular diagnostics
    • new molecular targets for therapy
    • finding and refining biological pathways
  • Recent examples
    • molecular diagnosis of leukemia, breast cancer, ...
    • appropriate treatment for genetic signature
    • potential new drug targets
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Total Solutions for Gene Expression
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Array Quality Control
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Array Contents:
Agilent Catalog Oligo DNA Microarray
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Agilent Catalog Oligo DNA Microarray
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Agilent Catalog Oligo DNA Microarray
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"Gene Selection"
  • Gene Selection
    • find genes for therapeutic targets
    • avoid false positives (FDA approval ?)
  • Classification (Supervised)
    • identify disease
    • predict outcome / select best treatment
  • Clustering (Unsupervised)
    • find new biological classes / refine existing ones
    • exploration
  • …
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Journals are Adopting the MGED Standards
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"Microarray Services Report"
  • Microarray Services Report
  • 晶片報告 ( I )


  • Customer Name: Dr. Liu


  • Sample Name: E7 vs.E7
  • Chip Name: Chip 4


  • File Name: NCKU-MSP-CR-2004-09-27-01
  • Date: 2004/09/27
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"I"
  • I. MIAME (Minimum Information About a Microarray Experiment)
  • Experiment Design:
    • Exp. description:
      • E7 (Cy5)
      • E7 (Cy3)
    • Exp. date: 2004-07-14 ~ 07-15 (實驗時間)
    • Image file:
      • E7: E7.tif
      • E7: E7.tif
    • Scan analysis file:
      • E7: E7.gpr
      • E7: E7.gpr
    • Analysis report file: Chip4_E7.xls
  • Array Design:
    • Array type: Oncogene-Kinase chip (Chip4)
    • Gene information file: chip4_ArrayDesign_genelist.xls
    • Array Location:
      • 12 rows × 16 columns × 3 blocks
      • Chip4_array location.xls
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"II"
  • II. Analysis Result
  •     1. Array Chip Statistics: Chip4_E7 vs E7_chipStat.xls
    • Vital statistics table
    • Intensity and Ratio Statistics
  •     2. Histogram Analysis
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"4"
  • 4. Top 15 of Up- and Down-regulated genes list
    • Chip4_E7 vs E7_up&down.xls
    • CGAP
      • Chip4_E7 vs E7_up_top15_CGAP.txt
      • Chip4_E7 vs E7_down_top15_CGAP.txt
  • 5. Microarray Image Figure
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"Simple way"
  • Simple way: fixed circle method
  • Advanced: fast marching level set segmentation
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Image Analysis & Data Visualization
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"Microarray Services Report"
  • Microarray Services Report
  • 實驗分析報告 ( II )


  • Customer Name: Dr. Liu


  • Chip Number:
  •              E7 vs. E7: NCKU-MSP-CR-2004-09-27-01
  •              E7+AS vs. E7: NCKU-MSP-CR-2004-09-27-02
  •                               File Name: NCKU-MSP-EXP-2004-09-27-01


  • Date: 2004/09/27
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"Clustering Result"
  • Clustering Result: Chip4_E7-E7withAS_Clustering_20040927.xls
    • Change Ratio > 1 Fold
    • Up-regulated Genes:
      • 60 Genes
    • Down-regulated Genes:
      • 75 Genes
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"Principal approaches"
  • Principal approaches:
  • Hierarchical clustering (kdb trees, CART, gene shaving)
  • K-means clustering
  • Self organizing (Kohonen) maps
  • Vector support machines
  • Gene Filtering via Multiobjective Optimization
  • Independent Component Analysis (ICA)
  • Validation approaches:
  • Significance analysis of microarrays (SAM)
  • Bootstrapping cluster analysis
  • Leave-one-out cross-validation
  • Replication (additional gene chip experiments, quantitative PCR)
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Data Mining Methodology is Critical!
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