A Haptoglobin (HP) Exon Deletion Polymorphism Alters the Effect of APOE Alleles on Alzheimer’s Disease in European‐Descent People with APOEε4

Haptoglobin (HP) is an antioxidant of apolipoprotein E (APOE) – the strongest risk gene for sporadic Alzheimer’s disease (AD). The HP gene has two functional alleles, HP2 and HP1, which contains a two‐exon deletion that changes its protein structure conformation. We hypothesize that this structural variation is associated with AD.