Estimation of Linkage Disequilibrium using GGT2 Software
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Estimation of Linkage Disequilibrium using GGT2 Software

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A tutorial showing estimation of Linkage Disequilibrium using GGT2 Software.

A tutorial showing estimation of Linkage Disequilibrium using GGT2 Software.

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  • 1. Awais Khan, University of Illinois, Urbana-Champaign Estimation of LD decay using Graphical GenoTypes (GGT) 2.0 software (van Berloo 2008) By Dr. M. Awais Khan University of Illinois, Urbana-Champaign
  • 2. Awais Khan, University of Illinois, Urbana-Champaign Click on “GGT2” to start the software
  • 3. Awais Khan, University of Illinois, Urbana-Champaign Click on “excel” icon, it will open “excel data exchange” window to enter data
  • 4. Awais Khan, University of Illinois, Urbana-Champaign Copy data from tabsheet “Demonstration data GAS” of excel file “ Demonstration data-LD-GGT” Click “import into GGT” to import data pasted into GGT Click on “Yes” for “Show Headers” and then Click on “Past Excel data” to paste data into “Excel data exchange” window
  • 5. Awais Khan, University of Illinois, Urbana-Champaign Each bar represents the genome of a single individual. Right Click individual bar or Click as shown above to see the detailed view of the genome of each individual
  • 6. Awais Khan, University of Illinois, Urbana-Champaign View of one individual
  • 7. Awais Khan, University of Illinois, Urbana-Champaign Click “LD” Calculation of LD Select “LD Measurement” as “Lewontin D`” and Click on “Calc LD for all loci”
  • 8. Awais Khan, University of Illinois, Urbana-Champaign Click on “LD diallel” to view LD values in diallel format
  • 9. Awais Khan, University of Illinois, Urbana-Champaign Click on “LD pairwise data” to view pairwise distance between markers and pairwise LD values for different LD measurements
  • 10. Awais Khan, University of Illinois, Urbana-Champaign Look at “Dist” column and “D`” column and observe the LD trend and distance between markers
  • 11. Awais Khan, University of Illinois, Urbana-Champaign To look at heat plot view of LD pattern Click on “HeatPlot”
  • 12. LD between the 5 SNPs in 1.64 kb region of a gene . The values in colored squares represent D ́ between SNP pairs. Summary of the results Awais Khan, University of Illinois, Urbana-Champaign Marker_1-Marker_2 Dist R² D` M1-M2 0.42 0.4 0.76 M1-M3 1.21 0.17 0.41 M1-M4 1.3 0.17 0.41 M1-M5 1.64 0.1 0.32 M2-M3 0.78 0.45 0.58 M2-M4 0.88 0.46 0.58 M2-M5 1.21 0.29 0.42 M3-M4 0.1 1 1 M3-M5 0.43 0.6 0.73 M4-M5 0.33 0.59 0.73
  • 13. Awais Khan, University of Illinois, Urbana-Champaign Reference: van Berloo R. 2008. GGT 2.0: versatile software for visualization and analysis of genetic data. J. Hered. 99:232–236