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Interpreting Allele frequency equal to 1.0

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Hi,

In the following vcf file, the AF allele frequency of ALT allele is 1.0. Does it mean that it is not a true SNP of interest? Does it also mean that ALT allele always occurs and REF allele never occurs in the population?

Also not sure how allele count AC=37 is being calculated.

Chr1 pos=565286, REF=C, ALT=T, Info AC=37; AF=1.0 Format GT:AC:AF:NC Child=1:11:1.0:+T=4,-
T=7 mother=1:26:1.0:+T=8,-T=18,

Cheers,
Ambi


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