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Displaying Genotype Data: Visual Genotypes The display and interpretation of large genotype data sets can be simplified by using a graphical display. We have found it useful to present complete raw datasets of individuals' genotype data using a display format called a visual genotype (VG) (see Nickerson et al., Nature Genetics, 19:233-240, 1998, and Rieder et al., Nature Genetics, 22:59-60, 1999). This format presents all data in an array of samples (rows) x polymorphic sites (columns) and encodes each diallelic polymorphism according to a general color scheme where:
This array format allows one to visually inspect the data across both individual's diplotypes and polymorphic sites
to make comparisons. Using this page you are able to upload a file (using the browse button to find a file on your own computer) and have a visual genotype produced. This image will appear in a separate browser window. Displaying EGP Finished DataYou are also able to directly view data from our Finished Genes list and interactively display these visual genotypes. Use the drop-down list titled "EGP Finished Gene Prettybase Input File" to select a gene. Display OptionsThe format of the visual genotype can be adjusted by filtering out polymorphisms below a minimum allele frequency. This is simply done by entering your minimum cutoff in the Rare Allele Percentage box. In order to cluster sites, we calculate r2 for all pairs of sites in a file, and then cluster sites such that sites with similar patterns of genotype (high r2) are shown near one another. We use an unweighted average linkage algorithm (UPGMA) to generate a hierarchical tree of cluster relationships (see more on VG2 site clustering). How to Save A Visual Genotype Image
Genotype Data Format: This file must be a tab-delimited file with four fields on each line, in the format: <Site Position><tab><Sample ID><tab><Allele 1><tab><Allele 2> e.g. 200 IND1 A A This line would represent a polymorphism at position 200, from a sample named IND1, with a homozygous genotype of allele A (both Allele 1 and Allele 2 are A). This format must be repeated on each line of your input file for *all* samples listed in your input file. If you have not genotyped a sample at a specific site, it would be entered with a genotype of "N N"). Multiple Site Example:
200 IND1 A A If you have questions about the data format please see our Finished Genes page, and select a gene and view the Individual Genotypes file. |
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