Is there a way to determine if a triallelic SNP in dbSNP was found in a single individual?
When a triallelic SNP is submitted to dbSNP, we do not know if they were ascertained in a single individual or a pooled population. For some of the triallelic SNPs, there maybe associated individual genotype or allele frequencies that might determine whether it was in a pooled population. During the SNP merging process, co-located SNPs with different biallelic pairs (e.g. A/T and G/T) are collapsed into a single triallelic observed line (e.g. A/T/G).
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