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From SNPedia

Appears in OMIM 141850.0011 relating to Hemoglobin I mutation. No indication seems to be given as to the risk allele, as far as I've searched, but if anyone wants to go looking in case I'm wrong, please do. For 23andMe users, this SNP is i5900733 and i5004447. This is the ClinVar stub for it.

The normal allele is A, and the variant allele is G. This is also cited in HbVar. Greg (talk) 15:10, 29 August 2015 (UTC)