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Chung S.J.,University of Ulsan | Kim M.-J.,Bobath Memorial Hospital | Kim J.,University of Ulsan | Kim Y.J.,University of Ulsan | And 4 more authors.
Neurobiology of Aging | Year: 2014

Genetic variants so far identified explain a small fraction of the overall inherited risk of Alzheimer's disease (AD). We aimed to identify novel genetic variants in AD using exome array that contains comprehensive panel. We genotyped 295,988 variants in 1005 subjects (400 AD cases and 605 controls) using Axiom Exome Genotyping Array that contains a pool of variants discovered in over 16 major human exome sequencing initiatives. Logistic regression analysis and the sequence kernel association optimal test were performed. The APOE, APOC1, and TOMM40 showed significant associations with AD in the single variant analysis. However, no significant association of other variants with AD was observed. This exome array study failed to identify novel genetic variants in AD. © 2014 Elsevier Inc.

Kim Y.S.,Hanyang University | Chung D.-I.,Hanyang University | Choi H.,Hanyang University | Baek W.,Hanyang University | And 6 more authors.
Stem Cells and Development | Year: 2013

Stem cell therapy (SCT) has been proposed for the treatment of neurological disorders. Although there is insufficient clinical evidence to support its efficacy, unproven SCTs are being performed worldwide. In this study, we investigated the perspectives and expectations of chronic ischemic stroke patients and physicians about SCTs. A total of 250 chronic ischemic stroke patients were interviewed at 4 hospitals. Structured open and closed questions about SCT for chronic stroke were asked by trained interviewers using the conventional in-person method. In addition, 250 stroke-related physicians were randomly interviewed via an e-mail questionnaire. Of the 250 patients (mean 63 years, 70% male), 121 (46%) responded that they wanted to receive SCT in spite of its unknown side effects. Around 60% of the patients anticipated physical, emotional, and psychological improvement after SCT, and 158 (63%) believed that SCT might prevent strokes. However, physicians had much lower expectations about the effectiveness of SCTs, which was not in line with patient expectations. Multivariate analysis revealed that the male gender [odds ratio (OR): 2.00, 95% confidence interval (CI): 1.10-3.64], longer disease duration (OR: 1.01, 95% CI: 1.00-1.02), higher modified Rankin Scale score (OR: 1.30, 95% CI: 1.06-1.60), and familiarity with stem cells (OR: 1.86, 95% CI: 1.10-3.15) were independently associated with wanting SCT. The major source of information about SCT was television (68%), and the most reliable source was physicians (49%). Patients have unfounded expectations that SCT will improve their functioning. Considering our finding that the major source of information on stem cells is media channels, but not the physician, to decrease patients' inappropriate exposure, doctors should make more effort to educate patients using mass media with accurate information. © 2013, Mary Ann Liebert, Inc.

Chung S.J.,University of Ulsan | Jung Y.,University of Ulsan | Hong M.,University of Ulsan | Kim M.J.,Bobath Memorial Hospital | And 4 more authors.
Neurobiology of Aging | Year: 2013

Alzheimer's disease (AD) and Parkinson's disease (PD) have overlapping clinical and pathological features, suggesting a common pathway for these 2 neurodegenerative disorders. Here we investigated the association of both AD and PD GWAS top hits with PD susceptibility. We selected 25 single nucleotide polymorphisms (SNPs) in 9 genes (ABCA7, APOE, BST1, CLU, CR1, LRRK2, PARK16, PICALM, and SNCA) that were genotyped in 1036 PD case patients and 1208 controls. Case patients and controls were all ethnic Koreans. Logistic regression analysis was performed to calculate age- and sex-adjusted odds ratios. None of the AD-susceptibility loci (ABCA7, APOE, CLU, CR1, and PICALM) showed statistically significant association with PD susceptibility. In contrast, we replicated associations of SNCA, LRRK2, BST1, and PARK16 with PD susceptibility in Koreans. Of those, the SNCA SNP rs11931074 showed the most significant associationwith PD susceptibility (adjusted odds ratio= 1.48; 95% confidence interval= 1.31-1.67; p=2.20E-10). In a logistic regression analysis with SNPs coded under an additive model, there was no significant genetic interaction between the LRRK2 and the PARK16 locus gene RAB7L1 in PD risk. Our results confirm the associations of SNCA, LRRK2, BST1, and PARK16 with PD susceptibility and fail to show significant associations of AD genome-wide association study (GWAS) top hits with PD susceptibility in a Korean population. © 2013 Elsevier Inc.

Chung S.J.,University of Ulsan | Kim M.-J.,Bobath Memorial Hospital | Kim Y.J.,University of Ulsan | Kim J.,University of Ulsan | And 4 more authors.
Journal of the Neurological Sciences | Year: 2014

Background The genetic factors that determine the heterogeneity of cognitive impairment in Alzheimer's disease (AD) patients have been rarely reported. We aimed to investigate the association between top hits of genome-wide association studies (GWAS) and specific cognitive domains in AD patients. Methods We investigated 86 single nucleotide polymorphisms (SNPs) selected from 12 genes (ABCA7, APOE, BIN1, CD2AP, CD33, CLU, CR1, EPHA1, LRAT, MS4A6A, PCDH11X, and PICALM) based on results of the recent GWAS and genotyped in 211 AD cases. We also analyzed results of comprehensive neuropsychological evaluations in all cases. We performed multiple regression analyses. Results There were four significant associations between genotypes and phenotypes of AD patients: CR1 SNP rs11803956 correlated with Mini-Mental State Examination (MMSE) score (β = 1.718, Pcorrected = 0.002); ABCA7 SNP rs3752232 correlated with Rey Complex Figure Test (RCFT) copy score (β = - 6.861, Pcorrected = 0.013); APOE SNP rs2075650 correlated with the percentile of RCFT copy score (β = 14.005, Pcorrected = 0.021) and the percentile of total score in phonemic fluency (β = 11.052, P corrected = 0.035). Conclusion Our results suggest that CR1, ABCA7, and APOE correlate with specific aspects of cognitive impairments in AD patients. © 2014 Elsevier B.V.

Lee J.S.,Jeju National University | Choi J.C.,Jeju National University | Kang S.-Y.,Jeju National University | Kang J.-H.,Jeju National University | And 2 more authors.
Journal of Clinical Neurology (Korea) | Year: 2011

Background and Purpose Cerebral autosomal-dominant arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is an inherited microangiopathy caused by mutations in the Notch3 gene. Although previous studies have shown an association between lacunar infarction and cognitive impairment, the relationship between MRI parameters and cognition remains unclear. In this study we investigated the influence of MRI parameters on cognitive impairment in CADASIL. Methods We applied a prospective protocol to 40 patients. MRI analysis included the normalized volume of white-matter hyperintensities (nWMHs), number of lacunes, and number of cerebral microbleeds. Cognition was assessed with the aid of psychometric tests [Mini-Mental State Examination (MMSE), Alzheimer's Disease Assessment Scale-cognition (ADAS-cog), Trail-Making Test, and Stroop interference (Stroop IF)]. Results A multivariate regression analysis revealed that the total number of lacunes influenced the performance in the MMSE, ADAS-cog, and Stroop IF, while nWMHs had a strong univariate association with ADAS-cog and Stroop IF scores. However, this association disappeared in the multivariate analysis. Conclusions These findings demonstrate that the number of lacunes is the main predictive factor of cognitive impairment in CADASIL. © 2011 Korean Neurological Association.

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