{"id":2115,"date":"2025-09-26T15:29:09","date_gmt":"2025-09-26T15:29:09","guid":{"rendered":"https:\/\/blogs.bmj.com\/jmg\/?p=2115"},"modified":"2026-02-22T00:26:58","modified_gmt":"2026-02-22T00:26:58","slug":"heterozygous-tbx2-frameshift-variants-cause-a-novel-syndromic-hearing-loss-with-incompletely-penetrant-nystagmus","status":"publish","type":"post","link":"https:\/\/blogs.bmj.com\/jmg\/2025\/09\/26\/heterozygous-tbx2-frameshift-variants-cause-a-novel-syndromic-hearing-loss-with-incompletely-penetrant-nystagmus\/","title":{"rendered":"Heterozygous TBX2 frameshift variants cause a novel syndromic hearing loss with incompletely penetrant nystagmus (Contributed by Dr. Jing Cheng)"},"content":{"rendered":"<p>Tbx2 is a transcription factor critical to inner hair cell specification and maintenance during murine cochlear development. However, its pathogenic role in human genetic hearing loss remains uncharacterized. In this study, we identified two heterozygous TBX2 frameshift variants in two unrelated families with hearing loss associated with incomplete penetrance nystagmus, via a combination of linkage analysis and whole-genome sequencing (WGS). Functional assays and a heterozygous Tbx2 knockout mouse model recapitulating the progressive hearing loss phenotype support haploinsufficiency as the pathogenic mechanism. These results establish TBX2 as a novel causal gene of syndromic hearing loss, facilitating earlier diagnosis and improving genetic counseling. (<a href=\"https:\/\/jmg.bmj.com\/content\/early\/2025\/09\/17\/jmg-2025-110997\">https:\/\/jmg.bmj.com\/content\/early\/2025\/09\/17\/jmg-2025-110997<\/a> )<\/p>\n<p><a href=\"https:\/\/blogs.bmj.com\/jmg\/2025\/09\/26\/heterozygous-tbx2-frameshift-variants-cause-a-novel-syndromic-hearing-loss-with-incompletely-penetrant-nystagmus\/summary-picture\/\" rel=\"attachment wp-att-2116\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-2116\" src=\"https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-300x300.jpg\" alt=\"\" width=\"300\" height=\"300\" srcset=\"https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-300x300.jpg 300w, https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-1024x1024.jpg 1024w, https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-150x150.jpg 150w, https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-768x768.jpg 768w, https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-640x640.jpg 640w, https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture-250x250.jpg 250w, https:\/\/blogs.bmj.com\/jmg\/files\/2025\/09\/Summary-Picture.jpg 1200w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><!--TrendMD v2.4.8--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tbx2 is a transcription factor critical to inner hair cell specification and maintenance during murine cochlear development. However, its pathogenic role in human genetic hearing loss remains uncharacterized. In this study, we identified two heterozygous TBX2 frameshift variants in two unrelated families with hearing loss associated with incomplete penetrance nystagmus, via a combination of linkage [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/blogs.bmj.com\/jmg\/2025\/09\/26\/heterozygous-tbx2-frameshift-variants-cause-a-novel-syndromic-hearing-loss-with-incompletely-penetrant-nystagmus\/\">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-2115","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Heterozygous TBX2 frameshift variants cause a novel syndromic hearing loss with incompletely penetrant nystagmus (Contributed by Dr. Jing Cheng) - 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\/2025\/09\/26\/heterozygous-tbx2-frameshift-variants-cause-a-novel-syndromic-hearing-loss-with-incompletely-penetrant-nystagmus\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heterozygous TBX2 frameshift variants cause a novel syndromic hearing loss with incompletely penetrant nystagmus (Contributed by Dr. Jing Cheng) - JMG Contact blog\" \/>\n<meta property=\"og:description\" content=\"Tbx2 is a transcription factor critical to inner hair cell specification and maintenance during murine cochlear development. However, its pathogenic role in human genetic hearing loss remains uncharacterized. 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