Publications by authors named "Lyoung H Kim"

Background: The prevailing exposure to Adverse Childhood Experiences (ACEs) among youth is associated with adolescents' mental health. However, few studies have examined whether receiving help from mental health services affects mental health outcomes among adolescents with ACEs. Therefore, this study examines the moderated effects of mental health services use on the relationship between exposures to ACEs and mental health outcomes among US adolescents.

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Objective: This study aimed to examine whether changes in mental health services use under the Patient Protection and Affordable Care Act (ACA) differed in Mental Health Professional Shortage Areas (MHPSAs) versus non-MHPSAs.

Methods: Multiple waves of data from the California Health Interview Survey (2011-2018) were analyzed. The sample (N=10,497) was restricted to adults (ages 18-64) who reported experiencing serious psychological distress (SPD) during the past 12 months.

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Background And Objective: Limited research exists on health inequities between American Indians and Alaska Natives (AIANs), tribal communities, and other population groups in the United States. To address this gap in research, we conducted time-trend analyses of social determinants of health and disease outcomes for AIANs as a whole and specific tribal communities and compared them with those from the other major racial/ethnic groups.

Methods: We used data from the 1990-2022 National Vital Statistics System, 2015-2022 American Community Survey, and the 2018-2020 Behavioral Risk Factor Surveillance System to examine socioeconomic, health, disability, disease, and mortality patterns for AIANs.

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During in vitro culture, human pluripotent stem cells (hPSCs) often acquire survival advantages characterized by decreased susceptibility to mitochondrial cell death, known as "culture adaptation." This adaptation is associated with genetic and epigenetic abnormalities, including TP53 mutations, copy number variations, trisomy, and methylation changes. Understanding the molecular mechanisms underlying this acquired survival advantage is crucial for safe hPSC-based cell therapies.

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Background: The Affordable Care Act (ACA) aimed to expand mental health service use in the US, by expanding access to health insurance. However, the gap in mental health utilization by race and ethnicity is pronounced: members of racial and ethnic minoritized groups remain less likely to use mental health services than non-Hispanic White individuals even after the ACA.

Aims Of The Study: This study assessed the effect of the Affordable Care Act (ACA) on mental health services use in one large state (California), and whether that effect differed among racial and ethnic groups.

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Background: Limited research exists on the association between housing, life expectancy, and mortality disparities in the United States (US). Using longitudinal individual-level and pooled county-level mortality data from 1979 to 2020, we examine disparities in life expectancy, child and youth mortality, and all-cause and cause-specific mortality in the US by several housing variables.

Methods: Using the 1979-2011 National Longitudinal Mortality Study (N=1,313,627) and the 2011-2020 linked county-level National Mortality Database and American Community Survey, we analyzed disparities in life expectancy and all-cause and cause-specific disparities by housing tenure, household crowding, and housing stability.

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Gliomas are the most common primary tumors in the brain and spinal cord. In previous GWASs, SNPs in epidermal growth factor receptor (EGFR) have been reported as risk loci for gliomas. However, EGFR variants associated with gliomas in the Korean population remain unstudied.

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Background: Previous genomewide association studies (GWASs), single nucleotide polymorphisms (SNPs) on cyclin-dependent kinase inhibitor 2 A (CDKN2A), cyclin-dependent kinase inhibitor 2B (CDKN2B), and cyclin-dependent kinase inhibitor 2B antisense RNA1 (CDKN2B-AS1) were reported as risk loci for glioma, a subgroup of the brain tumor. To further characterize this association with the risk of brain tumors in a Korean population, we performed a fine-mapping association study of CDKN2A, CDKN2B, and CDKN2B-AS1.

Methods And Results: A total of 17 SNPs were selected and genotyped in 1,439 subjects which were comprised of 959 patients (pituitary adenoma 335; glioma 324; meningioma 300) and 480 population controls (PCs).

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Background: Prior studies have documented racial and ethnic differences in mental healthcare utilization, and extensively in outpatient treatment and prescription medication usage for mental health disorders. However, limited studies have investigated racial and ethnic differences in length of inpatient stay (LOS) in patients with and without Serious and Persistent Mental Illness. Understanding racial and ethnic differences in LOS is necessary given that longer stays in hospital are associated with adverse health outcomes, which in turn contribute to health inequities.

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Background: Hepatitis B is known to cause several forms of liver diseases including chronic hepatitis B (CHB), and hepatocellular carcinoma. Previous genome-wide association study of CHB risk has demonstrated that rs12614 of complement factor B (CFB) was significantly associated with CHB risk. In this study, fine-mapping study of previously reported GWAS single nucleotide polymorphism (SNP; CFB rs12614) was performed to validate genetic effect of rs12614 on CHB susceptibility and identify possible additional causal variants around rs12614 in a Korean population.

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Purpose: Previous studies have revealed that PHLDB1 single-nucleotide polymorphisms (SNPs) are associated with glioma risk. Nonetheless, the association between PHLDB1 SNPs and the risk of pituitary adenoma has not been studied. The present study evaluated the association of PHLDB1 SNPs with the risk of pituitary adenomas.

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Previous studies have identified multiple loci for inherited susceptibility to glioma development, including the regulator of telomere elongation helicase 1 (RTEL1). However, the association between RTEL1 variants and risk of glioma has not been well understood. Therefore, we sought to comprehensively examine the genetic interaction between RTEL1 variants and risk of glioma with respect to defined histological and molecular subtypes.

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Article Synopsis
  • - The study focused on the role of C2 genetic variants in chronic hepatitis B and liver cancer risk, identifying conflicting results in prior research among a Korean population.
  • - Researchers analyzed 22 common C2 variants in 977 cases of chronic hepatitis B, revealing significant associations for six specific variants with the disease.
  • - Two variants, rs9267665 and rs10947223, were highlighted as key factors that independently increased the risk of chronic hepatitis B, suggesting that the C2 gene may be important for understanding susceptibility in this group.
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Chronic hepatitis B (CHB) is a precursor to liver cirrhosis and hepatocellular carcinoma, caused by a Hepatitis B viral infection. Genome-wide association studies (GWASs) have been conducted to find genes associated with CHB risk. In previous GWAS, EHMT2 was identified as one of the susceptibility genes for CHB.

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Background: Aspirin-exacerbated respiratory disease (AERD) is characterized by a severe and sudden asthma attack after aspirin ingestion in patients with asthma. We studied associations with six common single nucleotide polymorphisms (SNP) of the gasdermin B gene (GSDMB).

Objective: DNA obtained from 572 patients with asthma (with AERD, n = 165; and with aspirin-tolerant asthma, n = 407) and 391 normal controls was subjected to genotyping of six SNPs of GSDMB.

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Background & Aims: Hepatitis B viral infection is a serious risk factor for chronic hepatitis B (CHB), cirrhosis and hepatocellular carcinoma. Recently, several genome-wide association studies (GWASs) have been conducted to identify important genetic variant associated with the risk of CHB. In our previous GWAS, TCF19 was identified as one of the susceptibility genes for CHB risk (P=4.

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Article Synopsis
  • Schizophrenia is a complex brain disorder influenced by multiple genetic and environmental factors, and recent studies have attempted to identify specific genetic risks associated with it.
  • A genome-wide association study (GWAS) was conducted on a Korean population, analyzing over a million SNPs in patients with schizophrenia and controls, highlighting specific SNPs (rs9607195 and rs12738007) significantly linked to the disorder.
  • The study's findings, especially the replicated association of the MECR gene's SNP, offer potential insights into genetic risk factors for schizophrenia and may aid in developing better diagnostic tools.
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Organic anion-transporting polypeptide (OATP; gene symbol, SLCO) transporters are generally involved in the uptake of multiple drugs and their metabolites at most epithelial barriers. The pattern of single-nucleotide polymorphisms (SNPs) in these transporters may be determinants of interindividual variability in drug disposition and response. The objective of this study was to define the distribution of SNPs of three SLCO genes, SLCO1B1, SLCO1B3, and SLCO2B1, in a Korean population and other ethnic groups.

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A recent genome-wide association study (GWAS) for hepatitis B virus (HBV)-related hepatocellular carcinoma (HCC) identified two loci (rs7574865 in STAT4 and rs9275319 in HLA-DQ) in a Chinese population. We attempted to replicate the associations between the two SNP loci and the risk of HCC in a Korean population. The rs7574865 in STAT4 and rs9275319 in HLA-DQ were genotyped in a total of 3838 Korean subjects composed of 287 HBV-related hepatocellular carcinoma patients, 671 chronic hepatitis B virus (CHB) patients, and 2880 population controls using TaqMan genotyping assay.

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Tuberculosis (TB) is an infectious disease caused by mycobacterium, which most commonly affects the lungs. The adaptive immune response in Mycobacterium tuberculosis is predominantly mediated by the interferon-γ (IFN-γ) signaling pathway, which is regulated by IFN-γ receptors (IFNGR). IFN-γ activates the transcription of a number of genes that are important in immune responses, thus the appropriate function of IFNGR appears to be important in host defense against mycobacteria.

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Background & Aims: Hepatitis B virus (HBV) infection is the most serious risk factor for chronic hepatitis B (CHB), cirrhosis, and hepatocellular carcinoma. Recently, several genome-wide association studies (GWASs) identified important variants associated with the risk of CHB in Asian populations. Specifically, our previous GWAS identified the VARS2-SFTA2 gene region as one of the genetic risk loci for CHB.

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Aspirin-exacerbated respiratory disease (AERD) is one phenotype of asthma, often occurring in the form of a severe and sudden attack. Due to the time-consuming nature and difficulty of oral aspirin challenge (OAC) for AERD diagnosis, non-invasive biomarkers have been sought. The aim of this study was to identify AERD-associated exonic SNPs and examine the diagnostic potential of a combination of these candidate SNPs to predict AERD.

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Background: A recent genome-wide association study has identified 5-hydroxytrytamine (serotonin) receptor 7, adenylate cyclase-coupled (HTR7) as a risk gene for alcohol dependence. In addition, the serotonergic system has been considered as a modulator that plays an important role in alcohol use disorders. Functional, pharmacological, and genetic studies of serotonin neurotransmission have revealed that serotonin receptors are potential targets for the treatment of alcohol use disorders.

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Purpose: Melanocortin 3 Receptor (MC3R) is one of the families of seven-transmembrane G-protein-coupled receptors, and a recent study showed that MCR3 promoter polymorphism was significantly associated with the susceptibility of tuberculosis (TB) in South African population.

Methods: We analyzed six MC3R polymorphisms to examine the genetic effects on the risk of pulmonary TB in Korean subjects by using TaqMan assays and case-control analyses.

Results: Using statistical analyses, one common promoter polymorphism (MC3R rs11575886 T > C) was found to be associated with an increased risk of pulmonary TB.

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Recently, CYP2A6, CYP2B6, CYP2C8, and CYP2E1 have been reported to play a role in the metabolic effect of pharmacological and carcinogenic compounds. Moreover, genetic variations of drug metabolism genes have been implicated in the interindividual variation in drug disposition and pharmacological response. To define the distribution of single nucleotide polymorphisms (SNPs) in these four CYP2 family genes and to discover novel SNPs across ethnic groups, 288 DNAs composed of 48 African-Americans, 48 European-Americans, 48 Japanese, 48 Han Chinese, and 96 Koreans were resequenced.

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