Exploring variants in Ensembl Plants, Demo
In any of the sequence views shown in the Gene and Transcript tabs, you can view variants on the sequence. You can do this by clicking on Configure this page from any of these views.
Let’s take a look at the Gene sequence view for OS01G0775500 in rice. Search for OS01G0775500 and go to the Sequence view.
If you can’t see variants marked on this view, click on Configure this page and select Show variants: Yes and show links.
Find out more about a variant by clicking on it.
You can add variants to all other sequence views in the same way.
You can go to the Variation tab by clicking on the variant ID. For now, we’ll explore more ways of finding variants.
To view all the sequence variants in table form, click the Variant table link at the left of the gene tab.
You can filter the table to only show the variants you’re interested in. For example, click on Consequences: All, then select the variant consequences you’re interested in. For display purposes, the table above has already been filtered to only show missense variants.
You can also filter by the different pathogenicity scores and MAF, or click on Filter other columns for filtering by other columns such as Evidence or Class.
The table contains lots of information about the variants. You can click on the IDs here to go to the Variation tab too.
Let’s have a look at variants in the Location tab. Click on the Location tab in the top bar.
Configure this page and open Variation from the left-hand menu.
There are various options for turning on variants. You can turn on variants by source, by frequency, presence of a phenotype or by individual genome they were isolated from. You can also turn on genotyping chips.
Let’s have a look at a specific variant. If we zoomed in we could see the variant rs18335701 in this region, however it’s easier to find if we put rs18335701 into the search box. Click through to open the Variation tab for Oryza sativa Japonica.
The icons show you what information is available for this variant. Click on Genes and regulation, or follow the link on the left.
This page illustrates the genes the variant falls within and the consequences on those genes, including pathogenicity predictors. It also shows data from GTEx on genes that have increased/decreased expression in individuals with this variant, in different tissues. Finally, regulatory features and motifs that the variant falls within are shown.
Let’s look at population genetics. Click on Population genetics in the left-hand menu.
The population allele frequencies are shown by study. Where genotype frequencies are available, these are shown in the tables.
We can see which strains these genotypes were observed in by going to Sample Genotypes. Click on Show for the Duitama et al. 2015 population.