P1‐143: A PATHOGENIC PRESENILIN‐1 (PSEN1) TRP165CYS MUTATION, DISCOVERED IN A KOREAN PATIENT

Family-based Quasi-likelihood Score test (Won et al, 2015, BMC Bioinformatics). This approach, implented in the ONETOOL program (Song et al, 2018, Bioinformatics), incorporates a unique test statistc that considers heterogeneity of effect due to ascertainment bias among family members and. Analyses were performed using a regression model that included a term for the SNP and covariates for sex, and age. We also tested association within APOE4 carriers (E4+) and noncarriers (E4-) respectively. Results: The most significant association was observed with several SNPs near EPHA6 including rs7611319 (P1⁄43.19x10), rs1433241 (P1⁄44.44x10), rs6438286 (P1⁄44.99x10) and rs1560741 (P1⁄45.48x10). But, these SNPs are not significant in the APOE subgroup analysis, the pattern of association was similar within them. However, there are suggestive findings in APOE E4group including rs13124088 (ATP8A1, P1⁄41.14x10), rs1805543 (GRIN2B, P1⁄43.52x10), and rs11055557 (GRIN2B, P1⁄43.87x10). Conclusions: EPHA6 is a member of the Eph receptor tyrosine kinase family that mediates axon guidance with bidirectional signaling into neighboring cells, including EPHA1, which is a previously established AD risk gene. Furthermore, Ephs and ephrins have been found to play a role in neuronal morphogenesis and synaptic transmission, including memory formation and retention. Our findings suggest that family-based analysis with MFQLS method is a useful approach to identifying novel genetic associations with complex diseases.