A coding variant in CR1 interacts with APOE-ε4 to influence cognitive decline.

Abstract:

:Complement receptor 1 (CR1) is an Alzheimer's disease (AD) susceptibility locus that also influences AD-related traits such as episodic memory decline and neuritic amyloid plaque deposition. We implemented a functional fine-mapping approach, leveraging intermediate phenotypes to identify functional variant(s) within the CR1 locus. Using 1709 subjects (697 deceased) from the Religious Orders Study and the Rush Memory and Aging Project, we tested 41 single-nucleotide polymorphisms (SNPs) within the linkage disequilibrium block containing the published CR1 AD SNP (rs6656401) for associations with episodic memory decline, and then examined the functional consequences of the top result. We report that a coding variant in the LHR-D (long homologous repeat D) region of the CR1 gene, rs4844609 (Ser1610Thr, minor allele frequency = 0.02), is associated with episodic memory decline and accounts for the known effect of the index SNP rs6656401 (D' = 1, r(2)= 0.084) on this trait. Further, we demonstrate that the coding variant's effect is largely dependent on an interaction with APOE-ε4 and mediated by an increased burden of AD-related neuropathology. Finally, in our data, this coding variant is also associated with AD susceptibility (joint odds ratio = 1.4). Taken together, our analyses identify a CR1 coding variant that influences episodic memory decline; it is a variant known to alter the conformation of CR1 and points to LHR-D as the functional domain within the CR1 protein that mediates the effect on memory decline. We thus implicate C1q and MBL, which bind to LHR-D, as likely targets of the variant's effect and suggest that CR1 may be an important intermediate in the clearance of Aβ42 particles by C1q.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Keenan BT,Shulman JM,Chibnik LB,Raj T,Tran D,Sabuncu MR,Alzheimer's Disease Neuroimaging Initiative.,Allen AN,Corneveaux JJ,Hardy JA,Huentelman MJ,Lemere CA,Myers AJ,Nicholson-Weller A,Reiman EM,Evans DA,Bennett DA,De J

doi

10.1093/hmg/dds054

subject

Has Abstract

pub_date

2012-05-15 00:00:00

pages

2377-88

issue

10

eissn

0964-6906

issn

1460-2083

pii

dds054

journal_volume

21

pub_type

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