{"id":5065,"date":"2026-10-28T13:16:05","date_gmt":"2026-10-28T04:16:05","guid":{"rendered":"https:\/\/bdsl.jbnu.ac.kr\/blog\/?p=5065"},"modified":"2026-10-28T13:16:07","modified_gmt":"2026-10-28T04:16:07","slug":"journal-club-dysbiotic-signatures-and-diagnostic-potential-of-gut-microbial-markers-for-inflammatory-bowel-disease-in-korean-population","status":"publish","type":"post","link":"https:\/\/bdsl.jbnu.ac.kr\/blog\/journal-club-dysbiotic-signatures-and-diagnostic-potential-of-gut-microbial-markers-for-inflammatory-bowel-disease-in-korean-population\/","title":{"rendered":"[Journal club] Dysbiotic signatures and diagnostic potential of gut microbial markers for inflammatory bowel disease in Korean population"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Scientific Reports (2024)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Hyun Sik Kim, Shin Ju Oh, Byung Kwon Kim, Ji Eun Kim, Bo-Hyung Kim, Young-Kyu Park, Bo-Gie Yang, Jae-Yun Lee, Jin-Woo Bae &amp; Chang Kyun Lee<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<h2 class=\"wp-block-heading\">\uc5f0\uad6c \ud544\uc694\uc131<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IBD (Crohn&#8217;s disease and ulcerative colitis) is increasing rapidly in Asia, including Korea, but most gut microbiome studies have been conducted in Western populations.<\/li>\n\n\n\n<li>Previous Asian studies were limited by small sample sizes, lack of healthy controls, or lack of detailed functional annotation.<\/li>\n\n\n\n<li>Therefore, a large cohort with ethnicity-matched healthy controls is needed to characterize both taxonomic and functional microbiome signatures of IBD.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc5f0\uad6c \ubaa9<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>To characterize the taxonomic and functional gut microbiome signature of Korean IBD patients compared with healthy controls matched for ethnicity and lifestyle.<\/li>\n\n\n\n<li>To identify a small set of microbial markers that can discriminate healthy vs IBD, healthy vs CD, healthy vs UC, and CD vs UC.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc2e4\ud5d8 \ubc29\ubc95<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Fecal samples from 640 participants were collected (117 healthy controls, 223 CD, 300 UC). Patients were in a stable phase, and healthy controls were strictly screened.<\/li>\n\n\n\n<li>16S rRNA (V3-V4) sequencing on Illumina MiSeq; preprocessing with DADA2, Skewer and Mothur; taxonomy assigned with SILVA.<\/li>\n\n\n\n<li>Alpha and beta diversity (UniFrac, PERMANOVA) were analyzed.<\/li>\n\n\n\n<li>Differential abundance was tested with MaAsLin2, adjusted for age, sex, BMI, smoking, alcohol, stool consistency and disease activity.<\/li>\n\n\n\n<li>Functions (KO, EC, KEGG and MetaCyc pathways) were predicted with PICRUSt2, and a functional dysbiosis score was calculated.<\/li>\n\n\n\n<li>Random forest models were built to select diagnostic marker genera, evaluated by AUROC.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\uc8fc\uc694 \uacb0\uacfc<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Alpha diversity was lower in IBD, most in CD. Within CD, diversity fell further in stricturing\/penetrating behavior.<\/li>\n\n\n\n<li>Beta diversity differed significantly between groups, but effect sizes were small (R2 about 1-5%).<\/li>\n\n\n\n<li>Many SCFA-producing genera (e.g., Agathobacter, Blautia, Lachnospira) were depleted in both CD and UC. Only Escherichia-Shigella increased significantly in CD, and no genus increased in both diseases.<\/li>\n\n\n\n<li>Predicted functional profiles of CD were widely scattered compared with healthy controls (Healthy vs CD R2 about 0.14).<\/li>\n\n\n\n<li>Virulence-related pathways (shigellosis, bacterial invasion of epithelial cells, LPS biosynthesis, secretion system) and a taurine-cysteine-H2S pathway were enriched in CD.<\/li>\n\n\n\n<li>Functional dysbiosis was found in about 5% of healthy, 50% of CD and 22% of UC.<\/li>\n\n\n\n<li>2-3 genera discriminated groups with AUROC 0.845 (Healthy vs IBD), 0.860 (Healthy vs CD), 0.826 (Healthy vs UC) and 0.718 (CD vs UC).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Take home message<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Korean IBD patients show a distinct gut microbiome signature, with Escherichia-Shigella expansion and enrichment of virulence and H2S-producing pathways as hallmarks of CD dysbiosis.<\/li>\n\n\n\n<li>A small panel of 2-3 genera may serve as a low-cost, non-invasive diagnostic aid, but validation in independent cohorts is needed.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Points helpful for my research<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>This paper helped to understand a practical workflow for biomarker discovery: MaAsLin2 to select candidate genera, followed by a random forest model evaluated by AUROC.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">PDF files<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/doi.org\/10.1038\/s41598-024-74002-6\">https:\/\/doi.org\/10.1038\/s41598-024-74002-6<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scientific Reports (2024) Hyun Sik Kim, Shin Ju Oh, Byung Kwon Kim, Ji Eun Kim, Bo-Hyung Kim, Young-Kyu Park, Bo-Gie Yang, Jae-Yun Lee, Jin-Woo Bae &amp; Chang Kyun Lee Summary \uc5f0\uad6c \ud544\uc694\uc131 \uc5f0\uad6c \ubaa9 \uc2e4\ud5d8 \ubc29\ubc95 \uc8fc\uc694 \uacb0\uacfc Take home message Points helpful for my research PDF files https:\/\/doi.org\/10.1038\/s41598-024-74002-6<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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