rs12459419
— CD33 CD33 exon 2 splicing variant
Coding variant in CD33 (Siglec-3) that alters exon 2 splicing in microglia — the T allele promotes exon 2 skipping, producing a short CD33 isoform that lacks the sialic acid-binding IgV domain and enhances microglial phagocytosis of amyloid-beta, reducing Alzheimer's disease risk
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