1.Causal effects of fluid intelligence on psychiatric disorders
Sunyeup KIM ; Gahyun KIM ; Minyoung KIM ; Kyung-Hun SUNG ; Seunghyup LEE ; Youngoh BAE ; Seung Won LEE
Precision and Future Medicine 2026;10(1):27-38
Purpose:
Fluid intelligence (FI), a core cognitive function involved in reasoning and problem-solving, has been linked to psychiatric outcomes in observational studies. However, causal inferences remain challenging due to confounding and reverse causation. This study aimed to investigate the causal effects of FI on 10 major psychiatric disorders using Mendelian randomization (MR).
Methods:
We performed a phenome-wide association study-based two-sample MR analysis to evaluate the effects of genetically proxied FI on 10 psychiatric disorders. Genome-wide association study summary statistics were obtained from large-scale European cohort studies. The inverse-variance-weighted method served as the primary analytical method, and complementary sensitivity analyses were conducted to assess pleiotropy and heterogeneity.
Results:
Higher FI was causally associated with a reduced risk of attention-deficit/hyperactivity disorder (ADHD) (odds ratio [OR], 0.72; P< 0.001), schizophrenia (OR, 0.69; P= 0.016), and post-traumatic stress disorder (PTSD) (OR, 0.93; P= 0.006). In contrast, FI was positively associated with an increased risk of autism spectrum disorder (ASD; OR, 1.43; P < 0.001) and anorexia nervosa (OR, 1.39; P= 0.005). No significant associations were observed for major depressive disorder, anxiety disorder, bipolar disorder, obsessive-compulsive disorder, or postpartum depression. Sensitivity analyses supported the robustness of these findings, with no evidence of directional pleiotropy or undue influence of individual single-nucleotide polymorphisms.
Conclusion
This study provides genetic evidence that higher FI exerts divergent causal effects across psychiatric disorders, protective in externalizing and stress-related conditions (ADHD, PTSD, and schizophrenia) but associated with an increased risk of neurodevelopmental and internalizing conditions (ASD and anorexia nervosa). These findings highlight the need for a nuanced understanding of cognitive capacity in psychiatric vulnerability and guide preventive strategies tailored to disorder-specific cognitive profiles.
2.Polyunsaturated Fatty Acids and Skin Cancer: Two-Sample Mendelian Randomization Study
Gahyun KIM ; Bo Ri KIM ; Kyungho PAIK ; Seon-Pil JIN ; Hyunsun PARK ; Woojae MYUNG ; Jin-Ku LEE ; Chong Won CHOI ; Jinho KIM
Annals of Dermatology 2025;37(6):363-376
Background:
Observational studies have suggested associations between dietary polyunsaturated fatty acids (PUFAs) and cancer risk; however, causal inference regarding skin cancer remains limited due to potential recall bias, confounding, and reverse causation.
Objective:
This study aimed to evaluate the causal association between genetically predicted circulating PUFA levels and the risk of skin cancers, including basal cell carcinoma (BCC), squamous cell carcinoma (SCC), and melanoma.
Methods:
We conducted a 2-sample Mendelian randomization (MR) study using genome-wide association study summary statistics from the UK Biobank (PUFAs, n=115,006) and the FinnGen consortium (BCC, n=26,272; SCC, n=4,663; melanoma, n=5,753). Genetic instruments were derived for omega-3, docosahexaenoic acid, omega-6, linoleic acid, and the omega-6:3 ratio.Multiple MR methods—including inverse-variance weighted, MR-Egger, weighted median, weighted mode, and MR-PRESSO—were applied to test for consistency and assess pleiotropy and heterogeneity.
Results:
A higher genetically predicted linoleic acid to total fatty acid ratio was associated with a significantly lower risk of BCC and SCC. Conversely, higher genetically proxied serum omega-3 levels were associated with increased risks of BCC, SCC, and melanoma. The risk effect on SCC was attenuated upon exclusion of rs174528, a variant in the fatty acid desaturase 1 (FADS1) gene, suggesting a role for endogenous PUFA metabolism in carcinogenesis.
Conclusion
This MR analysis supports a causal role of circulating PUFAs in skin cancer development and highlights the importance of FADS-mediated endogenous PUFA metabolism. These findings provide novel insights into the genetic and metabolic underpinnings of skin cancer susceptibility.
3.A comparative analysis of canine Internal Medicine pancreatic lipase tests for diagnosing pancreatitis in dogs
Jin-Kyung KIM ; Sun Young HWANG ; Se Eun KIM ; Gahyun LEE ; Soungjin JI ; Jungho KIM ; Yongbaek KIM
Journal of Veterinary Science 2024;25(3):e48-
Objective:
Many qualitative and quantitative commercial cPL tests have been developed and used in veterinary clinics. This study aimed to compare three different methodologies SNAP cPL, Spec cPL, and Vcheck cPL tests to assess the concordance of these assays.
Methods:
Fifty serum samples were collected from 36 dogs with or without pancreatitis and subjected to SNAP cPL, Spec cPL, and Vcheck cPL tests. Agreement and correlation coefficients were calculated between the test results, and correlations were determined during the management of the patients.
Results:
The results of the three cPL assays were strongly correlated in 47/50 serum samples (94%). Cohen’s kappa analysis between the Spec cPL and Vcheck cPL showed near perfect agreement (κ = 0.960, p < 0.001), SNAP cPL and Vcheck cPL (κ = 0.920, p < 0.001), and Spec cPL and SNAP cPL (κ = 0.880, p < 0.001). The correlation coefficients (r) between data from Spec cPL and Vcheck cPL tests was calculated by Spearman’s correlation test (r = 0.958, p < 0.001).Furthermore, the patterns of change in serum cPL concentrations determined using Spec cPL and Vcheck cPL were significantly consistent during the monitoring period in 11 patients.
Conclusions
and Relevance: Our data illustrated that Spec cPL and Vcheck cPL tests are compatible for clinical use in the diagnosis and monitoring of canine pancreatitis.
4.Amelioration of DSS-induced colitis in mice by TNF-α-stimulated mesenchymal stem cells derived from feline adipose tissue via COX-2/PGE2 activation
Kyeongbo KIM ; Ju-Hyun AN ; Su-Min PARK ; GaHyun LIM ; Kyung-Won SEO ; Hwa-Young YOUN
Journal of Veterinary Science 2023;24(4):e52-
Background:
Mesenchymal stem cells (MSCs) have been investigated as therapeutic agents for inflammatory bowel disease (IBD). Stimulation of MSCs with pro-inflammatory cytokines is an approach to enhance their immunomodulatory effects. However, further investigation is required to support their application in immune-mediated disorders and companion animals.
Objectives:
This study aimed to assess the therapeutic effect of tumor necrosis factor (TNF)-α-stimulated feline adipose tissue-derived MSCs (fAT-MSCs) in a dextran sulfate sodium (DSS)-induced colitis mouse model.
Methods:
Colitis mice was made by drinking water with 3% DSS and fAT-MSCs were injected intraperitoneally. Colons were collected on day 10. The severity of the disease was evaluated and compared. Raw 264.7 cells were cultured with the conditioned medium to determine the mechanism, using quantitative real-time polymerase chain reaction and enzyme-linked immunosorbent assay.
Results:
TNF-α-stimulated fAT-MSCs more improved severity of DSS-induced colitis in disease activity, colon length, histologic score, and inflammatory cytokine. In sectionized colon tissues, the group comprising TNF-α-stimulated fAT-MSCs had higher proportion of CD11b + CD206 + macrophages than in the other groups. In vitro, TNF-α-stimulation increased cyclooxygenase-2 (COX-2) expression and prostaglandin E2 (PGE2 ) secretion from fAT-MSCs. The conditioned medium from TNF-α-stimulated fAT-MSCs enhanced the expression of interleukin-10 and arginase-1 in LPS-activated Raw 264.7 cells.
Conclusions
These results represent that TNF-α-stimulated fat-mscs ameliorate the inflamed colon more effectively. Furthermore, we demonstrated that the effectiveness was interlinked with the COX-2/PGE2 pathway.
5.Assessment of neovascularization during bone healing using contrast-enhanced ultrasonography in a canine tibial osteotomy model: a preliminary study
Sunghoon JEON ; Jaeyoung JANG ; Gahyun LEE ; Seungjo PARK ; Sang kwon LEE ; Hyunwook KIM ; Jihye CHOI
Journal of Veterinary Science 2020;21(1):e10-
Blood perfusion of skeletal muscle and callus was evaluated using contrast-enhanced ultrasonography (CEUS) in a canine osteotomy model to determine the applicability of CEUS in the assessment of neovascularization during fracture healing and to compare the vascular signals on CEUS between external skeletal fixation and cast-applied dogs. In 6 Beagle dogs, a simple transverse osteotomy was performed at the left tibial shaft and external skeletal fixation (n = 3) or a cast (n = 3) was applied. Radiography, power Doppler ultrasonography (power Doppler), and CEUS were performed until complete union was achieved. On CEUS, vascular changes were quantitatively evaluated by measuring peak intensity (PI) and time to PI in the soft tissue and callus and by counting the vascular signals. Vascular signals from the soft tissue were detected on power Doppler and CEUS on day 2. Significantly more vascular signals were detected by CEUS than by power Doppler. On CEUS, PI in the surrounding soft tissue was markedly increased after the fracture line appeared indistinctively changed on radiography in all dogs. In the cast-applied dogs, vascular signals from the periosteal and endosteal callus were detected on CEUS before mineralized callus was observed on radiography. CEUS was useful in assessing the vascularity of soft tissue and callus, particularly in indirect fracture healing, and provided indications of a normally healing fracture.
6.Assessment of neovascularization during bone healing using contrast-enhanced ultrasonography in a canine tibial osteotomy model: a preliminary study
Sunghoon JEON ; Jaeyoung JANG ; Gahyun LEE ; Seungjo PARK ; Sang kwon LEE ; Hyunwook KIM ; Jihye CHOI
Journal of Veterinary Science 2020;21(1):e10-
Blood perfusion of skeletal muscle and callus was evaluated using contrast-enhanced ultrasonography (CEUS) in a canine osteotomy model to determine the applicability of CEUS in the assessment of neovascularization during fracture healing and to compare the vascular signals on CEUS between external skeletal fixation and cast-applied dogs. In 6 Beagle dogs, a simple transverse osteotomy was performed at the left tibial shaft and external skeletal fixation (n = 3) or a cast (n = 3) was applied. Radiography, power Doppler ultrasonography (power Doppler), and CEUS were performed until complete union was achieved. On CEUS, vascular changes were quantitatively evaluated by measuring peak intensity (PI) and time to PI in the soft tissue and callus and by counting the vascular signals. Vascular signals from the soft tissue were detected on power Doppler and CEUS on day 2. Significantly more vascular signals were detected by CEUS than by power Doppler. On CEUS, PI in the surrounding soft tissue was markedly increased after the fracture line appeared indistinctively changed on radiography in all dogs. In the cast-applied dogs, vascular signals from the periosteal and endosteal callus were detected on CEUS before mineralized callus was observed on radiography. CEUS was useful in assessing the vascularity of soft tissue and callus, particularly in indirect fracture healing, and provided indications of a normally healing fracture.
8.Anesthetic considerations in a child with Sotos syndrome: A case report.
Joo Young CHUNG ; Gahyun KIM ; Ju Hun PARK ; Hyen Kyu CHOI ; Byoung Hark PARK ; Mi Young CHOI ; Jong Sool KIM
Anesthesia and Pain Medicine 2017;12(3):240-242
Sotos syndrome is a rare sporadic genetic disorder characterized by pathognomonic facial features, motor developmental delay induced by hypotonia, learning difficulties, and cardiac and renal anomalies. This report describes the case of a 4-year-old child with Sotos syndrome who underwent a right hydrocelectomy under general anesthesia. We report our experience with airway management, choice of anesthetic drugs, and other anesthetic implications in Sotos syndrome.
Airway Management
;
Anesthesia, General
;
Anesthetics
;
Child*
;
Child, Preschool
;
Humans
;
Learning
;
Muscle Hypotonia
;
Neuromuscular Blockade
;
Sotos Syndrome*
9.Combined spinal-epidural anesthesia in a mild thrombocytopenic patient with antiphospholipid antibody syndrome.
Gahyun KIM ; Hyunyee SIM ; Jaeyoung YANG ; Jong Hwan LEE ; Duck Hwan CHOI
Korean Journal of Anesthesiology 2014;67(Suppl):S100-S101
No abstract available.
Anesthesia*
;
Antiphospholipid Syndrome*
;
Humans
10.The anesthetic experience of implantable left ventricular assist device insertion: a case report.
Gahyun KIM ; Young Wan KIM ; Jong Hwan LEE ; Chung Su KIM ; Hyun Sung CHO ; Sangmin Maria LEE ; Young Tak LEE
Korean Journal of Anesthesiology 2014;66(1):67-70
Because of insufficient number of donor hearts for cardiac transplantation, the use of implantable left ventricular assist device (LVAD) has been increasing as an alternative. During this procedure, the fundamental role of anesthesiologists would be to maintain stable hemodynamics. This report describes the anesthetic case of a 75-year-old man who underwent implantable LVAD placement as a destination therapy of his heart failure in Korea. The procedure and anesthesia were uneventful with transesophageal echocariographic guide. He moved to the ward on postoperative day 10 without fatal complication.
Aged
;
Anesthesia
;
Echocardiography, Transesophageal
;
Heart
;
Heart Failure
;
Heart Transplantation
;
Heart-Assist Devices*
;
Hemodynamics
;
Humans
;
Korea
;
Tissue Donors

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