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Meta-Analysis
. 2023 Jun 22;18(1):40.
doi: 10.1186/s13024-023-00633-4.

A genome-wide search for pleiotropy in more than 100,000 harmonized longitudinal cognitive domain scores

Moonil Kang  1 , Ting Fang Alvin Ang  2   3   4 , Sherral A Devine  2   3 , Richard Sherva  1 , Shubhabrata Mukherjee  5 , Emily H Trittschuh  6   7 , Laura E Gibbons  5 , Phoebe Scollard  5 , Michael Lee  5 , Seo-Eun Choi  5 , Brandon Klinedinst  5 , Connie Nakano  5 , Logan C Dumitrescu  8   9 , Alaina Durant  8   9 , Timothy J Hohman  8   9 , Michael L Cuccaro  10 , Andrew J Saykin  11   12   13 , Walter A Kukull  14 , David A Bennett  15 , Li-San Wang  16 , Richard P Mayeux  17 , Jonathan L Haines  18 , Margaret A Pericak-Vance  10 , Gerard D Schellenberg  16 , Paul K Crane  5 , Rhoda Au  2   3   4   19   20 , Kathryn L Lunetta  3   21 , Jesse B Mez #  3   19   22 , Lindsay A Farrer #  23   24   25   26   27   28   29
Affiliations
Meta-Analysis

A genome-wide search for pleiotropy in more than 100,000 harmonized longitudinal cognitive domain scores

Moonil Kang et al. Mol Neurodegener. .

Abstract

Background: More than 75 common variant loci account for only a portion of the heritability for Alzheimer's disease (AD). A more complete understanding of the genetic basis of AD can be deduced by exploring associations with AD-related endophenotypes.

Methods: We conducted genome-wide scans for cognitive domain performance using harmonized and co-calibrated scores derived by confirmatory factor analyses for executive function, language, and memory. We analyzed 103,796 longitudinal observations from 23,066 members of community-based (FHS, ACT, and ROSMAP) and clinic-based (ADRCs and ADNI) cohorts using generalized linear mixed models including terms for SNP, age, SNP × age interaction, sex, education, and five ancestry principal components. Significance was determined based on a joint test of the SNP's main effect and interaction with age. Results across datasets were combined using inverse-variance meta-analysis. Genome-wide tests of pleiotropy for each domain pair as the outcome were performed using PLACO software.

Results: Individual domain and pleiotropy analyses revealed genome-wide significant (GWS) associations with five established loci for AD and AD-related disorders (BIN1, CR1, GRN, MS4A6A, and APOE) and eight novel loci. ULK2 was associated with executive function in the community-based cohorts (rs157405, P = 2.19 × 10-9). GWS associations for language were identified with CDK14 in the clinic-based cohorts (rs705353, P = 1.73 × 10-8) and LINC02712 in the total sample (rs145012974, P = 3.66 × 10-8). GRN (rs5848, P = 4.21 × 10-8) and PURG (rs117523305, P = 1.73 × 10-8) were associated with memory in the total and community-based cohorts, respectively. GWS pleiotropy was observed for language and memory with LOC107984373 (rs73005629, P = 3.12 × 10-8) in the clinic-based cohorts, and with NCALD (rs56162098, P = 1.23 × 10-9) and PTPRD (rs145989094, P = 8.34 × 10-9) in the community-based cohorts. GWS pleiotropy was also found for executive function and memory with OSGIN1 (rs12447050, P = 4.09 × 10-8) and PTPRD (rs145989094, P = 3.85 × 10-8) in the community-based cohorts. Functional studies have previously linked AD to ULK2, NCALD, and PTPRD.

Conclusion: Our results provide some insight into biological pathways underlying processes leading to domain-specific cognitive impairment and AD, as well as a conduit toward a syndrome-specific precision medicine approach to AD. Increasing the number of participants with harmonized cognitive domain scores will enhance the discovery of additional genetic factors of cognitive decline leading to AD and related dementias.

Keywords: Alzheimer’s disease; Cognitive domains; Genome-wide association study; Longitudinal measures; Pathway analysis; Pleiotropy.

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Conflict of interest statement

The authors declare they have no competing interests.

Figures

Fig. 1
Fig. 1
Locus Zoom plots showing the association of SNPs in the regions of novel loci with cognitive domains. The SNP with the lowest p-value at each locus is indicated with a purple diamond. Computed estimates of linkage disequilibrium (r2) of SNPs in the region with top-ranked SNP are color-coded according to the key. Vertical blue lines indicate locations of high recombination rates. Locations of genes in the region are shown below the diagram. a Association of rs157405 with executive function in the community-based cohorts. b Association of rs705353 with language in the clinic-based cohorts. c Association of rs117523305 with memory in the community-based cohorts. d Association of rs145012974 with language in the total sample. e Association of rs5848 with memory in the total sample
Fig. 2
Fig. 2
Locus Zoom plots showing genome-wide significant pleiotropy for SNPs in the regions of novel loci. The SNP with the lowest p-value at each locus is indicated with a purple diamond. Computed estimates of linkage disequilibrium (r2) of SNPs in the region with top-ranked SNP are color-coded according to the key. Vertical blue lines indicate locations of high recombination rates. Locations of genes in the region are shown below the diagram. a Association of rs12447050 with executive function and memory in the community-based cohorts. b Association of rs56162098 with language and memory in the community-based cohorts. c Association of rs145989094 with executive function and memory in the community-based cohorts. d Association of rs145989094 with language and memory in the community-based cohorts. e Association of rs73005629 with language and memory in the clinic-based cohorts
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