[ensembl-dev] Errors in minor allele and ancestral allele

[Emily Perry]

Hi Lee

Major does not mean ancestral. The major allele is the allele which is 
the most frequent. The ancestral allele is the allele found in the 
aligned region in related species. In most cases the ancestral allele 
will be the major one, but not always.

Taking your first example, rs7636839, the minor allele is G because it's 
found in 42% of 1000 Genomes individuals:
http://www.ensembl.org/Homo_sapiens/Variation/Population?db=core;r=3:189638652-189639652;v=rs7636839;vdb=variation;vf=4598592

The ancestral allele is also G because that's the allele found in 
Chimpanzee and other primates:
http://www.ensembl.org/Homo_sapiens/Variation/Compara_Alignments?db=core;r=3:189638652-189639652;v=rs7636839;vdb=variation;vf=4598592

All the best

Emily

On 21/07/2017 12:35, Lee Stopak wrote:
> Hi all,
>
> I am doing a number of calls to fetch ancestral allele, minor allele, 
> and allele frequency data. Overall, I have about 35000 SNPs to fetch. 
> I have no problem doing the calls, but about 15% of them return an 
> identical base as both the minor allele and the ancestral allele. When 
> I then lookup that SNP on the ensembl webpage, they are NOT the same 
> allele, but are different. Here are a few SNPs where the minor and 
> ancestral allele are returned the same:
>
> rs7636839
> rs2495239
> rs11705932
> rs6999859
> rs7432328
> rs546131
> rs6003982
> rs2203205
> rs10101158
> rs7366282
>
> Does anybody know why this is? I don't think it is a bug in my code, 
> considering the rest of the calls are returned correctly.
>
> Thanks!
>
>
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-- 
Dr Emily Perry (Pritchard)
Ensembl Outreach Project Leader

European Bioinformatics Institute (EMBL-EBI)
European Molecular Biology Laboratory
Wellcome Trust Genome Campus
Hinxton
Cambridge
CB10 1SD
UK

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