{"id":2176,"date":"2026-04-17T13:01:42","date_gmt":"2026-04-17T13:01:42","guid":{"rendered":"https:\/\/blogs.bmj.com\/jmg\/?p=2176"},"modified":"2026-04-17T13:01:43","modified_gmt":"2026-04-17T13:01:43","slug":"optical-genome-mapping-identifies-previously-undetected-causal-variants-in-early-onset-developmental-epileptic-encephalopathies-contributed-by-sanem-yilmaz","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/jmg\/2026\/04\/17\/optical-genome-mapping-identifies-previously-undetected-causal-variants-in-early-onset-developmental-epileptic-encephalopathies-contributed-by-sanem-yilmaz\/","title":{"rendered":"Optical Genome Mapping Identifies Previously Undetected Causal Variants in Early-Onset Developmental Epileptic Encephalopathies (Contributed by Sanem Yilmaz)"},"content":{"rendered":"<p>Developmental epileptic encephalopathies (DEEs) are severe childhood conditions that cause early-onset seizures and developmental delay. Although genetic testing can identify a cause in many patients, some remain undiagnosed despite extensive investigations. In this study, we used a newer method called optical genome mapping (OGM), which can detect certain genetic changes missed by standard tests. Among 32 children with DEE who remained undiagnosed despite multiple genetic tests, this approach identified underlying causes in two patients. These findings show that OGM can complement existing genetic tests and help provide answers for families still searching for a diagnosis. (<a href=\"https:\/\/jmg.bmj.com\/content\/early\/2026\/04\/16\/jmg-2026-111485\">https:\/\/jmg.bmj.com\/content\/early\/2026\/04\/16\/jmg-2026-111485<\/a>)<\/p>\n<p><a href=\"https:\/\/blogs.bmj.com\/jmg\/2026\/04\/17\/optical-genome-mapping-identifies-previously-undetected-causal-variants-in-early-onset-developmental-epileptic-encephalopathies-contributed-by-sanem-yilmaz\/photo-jmg\/\" rel=\"attachment wp-att-2177\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2177\" src=\"https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-300x155.jpg\" alt=\"\" width=\"300\" height=\"155\" srcset=\"https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-300x155.jpg 300w, https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-1024x529.jpg 1024w, https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-768x397.jpg 768w, https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-1536x794.jpg 1536w, https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-2048x1059.jpg 2048w, https:\/\/blogs.bmj.com\/jmg\/files\/2026\/04\/photo-jmg-640x331.jpg 640w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Developmental epileptic encephalopathies (DEEs) are severe childhood conditions that cause early-onset seizures and developmental delay. Although genetic testing can identify a cause in many patients, some remain undiagnosed despite extensive investigations. In this study, we used a newer method called optical genome mapping (OGM), which can detect certain genetic changes missed by standard tests. Among [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/jmg\/2026\/04\/17\/optical-genome-mapping-identifies-previously-undetected-causal-variants-in-early-onset-developmental-epileptic-encephalopathies-contributed-by-sanem-yilmaz\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":123,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2176","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Optical Genome Mapping Identifies Previously Undetected Causal Variants in Early-Onset Developmental Epileptic Encephalopathies (Contributed by Sanem Yilmaz) - JMG Contact blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.bmj.com\/jmg\/2026\/04\/17\/optical-genome-mapping-identifies-previously-undetected-causal-variants-in-early-onset-developmental-epileptic-encephalopathies-contributed-by-sanem-yilmaz\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Optical Genome Mapping Identifies Previously Undetected Causal Variants in Early-Onset Developmental Epileptic Encephalopathies (Contributed by Sanem Yilmaz) - JMG Contact blog\" \/>\n<meta property=\"og:description\" content=\"Developmental epileptic encephalopathies (DEEs) are severe childhood conditions that cause early-onset seizures and developmental delay. Although genetic testing can identify a cause in many patients, some remain undiagnosed despite extensive investigations. In this study, we used a newer method called optical genome mapping (OGM), which can detect certain genetic changes missed by standard tests. 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