A combined polygenic score of 21,293 rare and 22 common variants significantly improves diabetes diagnosis based on hemoglobin A1C levels
2021
Polygenic scores (PS), constructed from the combined effects of many genetic variants, have been shown to predict risk or treatment strategies for certain common diseases. As most PS to date are based on common variants, the benefit of adding rare variation to PS remains largely unknown and methodically challenging. We developed and validated a novel method for constructing a rare variant PS and applied it to a previously identified clinical scenario, in which genetic variants modify the hemoglobin A1C (HbA1C) threshold recommended for type 2 diabetes (T2D) diagnosis. The resultant rare variant PS is highly polygenic (21,293 variants across 144 genes), depends on ultra-rare variants (72.7% of variants observed in
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