Browsing by Author "Kang, Sarang"

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    APOE Promoter Polymorphism-219T/G is an Effect Modifier of the Influence of APOE ε4 on Alzheimer's Disease Risk in a Multiracial Sample
    (MDPI, 2019-08-16) Choi, Kyu Yeong; Lee, Jang Jae; Gunasekaran, Tamil Iniyan; Kang, Sarang; Lee, Wooje; Jeong, Jangho; Lim, Ho Jae; Zhang, Xiaoling; Zhu, Congcong; Won, So-Yoon; Choi, Yu Yong; Seo, Eun Hyun; Lee, Seok Cheol; Gim, Jungsoo; Chung, Ji Yeon; Chong, Ari; Byun, Min Soo; Seo, Sujin; Ko, Pan-Woo; Han, Ji-Won; McLean, Catriona; Farrell, John; Lunetta, Kathryn L.; Miyashita, Akinori; Hara, Norikazu; Won, Sungho; Choi, Seong-Min; Ha, Jung-Min; Jeong, Jee Hyang; Kuwano, Ryozo; Song, Min Kyung; An, Seong Soo A.; Lee, Young Min; Park, Kyung Won; Lee, Ho-Won; Choi, Seong Hye; Rhee, Sangmyung; Song, Woo Keun; Lee, Jung Sup; Mayeux, Richard; Haines, Jonathan L.; Pericak-Vance, Margaret A.; Choo, IL Han; Nho, Kwangsik; Kim, Ki-Woong; Lee, Dong Young; Kim, SangYun; Kim, Byeong C.; Kim, Hoowon; Jun, Gyungah R.; Schellenberg, Gerard D.; Ikeuchi, Takeshi; Farrer, Lindsay A.; Lee, Kun Ho; Radiology and Imaging Sciences, School of Medicine
    Variants in the APOE gene region may explain ethnic differences in the association of Alzheimer's disease (AD) with ε4. Ethnic differences in allele frequencies for three APOE region SNPs (single nucleotide polymorphisms) were identified and tested for association in 19,398 East Asians (EastA), including Koreans and Japanese, 15,836 European ancestry (EuroA) individuals, and 4985 African Americans, and with brain imaging measures of cortical atrophy in sub-samples of Koreans and EuroAs. Among ε4/ε4 individuals, AD risk increased substantially in a dose-dependent manner with the number of APOE promoter SNP rs405509 T alleles in EastAs (TT: OR (odds ratio) = 27.02, p = 8.80 × 10-94; GT: OR = 15.87, p = 2.62 × 10-9) and EuroAs (TT: OR = 18.13, p = 2.69 × 10-108; GT: OR = 12.63, p = 3.44 × 10-64), and rs405509-T homozygotes had a younger onset and more severe cortical atrophy than those with G-allele. Functional experiments using APOE promoter fragments demonstrated that TT lowered APOE expression in human brain and serum. The modifying effect of rs405509 genotype explained much of the ethnic variability in the AD/ε4 association, and increasing APOE expression might lower AD risk among ε4 homozygotes.
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    A missense variant in SHARPIN mediates Alzheimer's disease-specific brain damages
    (Springer Nature, 2021-11-16) Park, Jun Young; Lee, Dongsoo; Lee, Jang Jae; Gim, Jungsoo; Gunasekaran, Tamil Iniyan; Choi, Kyu Yeong; Kang, Sarang; Do, Ah Ra; Jo, Jinyeon; Park, Juhong; Park, Kyungtaek; Li, Donghe; Lee, Sanghun; Kim, Hoowon; Dhanasingh, Immanuel; Ghosh, Suparna; Keum, Seula; Choi, Jee Hye; Song, Gyun Jee; Sael, Lee; Rhee, Sangmyung; Lovestone, Simon; Kim, Eunae; Moon, Seung Hwan; Kim, Byeong C.; Kim, SangYun; Saykin, Andrew J.; Nho, Kwangsik; Lee, Sung Haeng; Farrer, Lindsay A.; Jun, Gyungah R.; Won, Sungho; Lee, Kun Ho; Radiology and Imaging Sciences, School of Medicine
    Established genetic risk factors for Alzheimer's disease (AD) account for only a portion of AD heritability. The aim of this study was to identify novel associations between genetic variants and AD-specific brain atrophy. We conducted genome-wide association studies for brain magnetic resonance imaging measures of hippocampal volume and entorhinal cortical thickness in 2643 Koreans meeting the clinical criteria for AD (n = 209), mild cognitive impairment (n = 1449) or normal cognition (n = 985). A missense variant, rs77359862 (R274W), in the SHANK-associated RH Domain Interactor (SHARPIN) gene was associated with entorhinal cortical thickness (p = 5.0 × 10-9) and hippocampal volume (p = 5.1 × 10-12). It revealed an increased risk of developing AD in the mediation analyses. This variant was also associated with amyloid-β accumulation (p = 0.03) and measures of memory (p = 1.0 × 10-4) and executive function (p = 0.04). We also found significant association of other SHARPIN variants with hippocampal volume in the Alzheimer's Disease Neuroimaging Initiative (rs3417062, p = 4.1 × 10-6) and AddNeuroMed (rs138412600, p = 5.9 × 10-5) cohorts. Further, molecular dynamics simulations and co-immunoprecipitation indicated that the variant significantly reduced the binding of linear ubiquitination assembly complex proteins, SHPARIN and HOIL-1 Interacting Protein (HOIP), altering the downstream NF-κB signaling pathway. These findings suggest that SHARPIN plays an important role in the pathogenesis of AD.