{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,20]],"date-time":"2026-10-20T01:13:20Z","timestamp":1792458800661,"version":"4.5.0"},"reference-count":65,"publisher":"MDPI AG","issue":"3","license":[{"start":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T00:00:00Z","timestamp":1788393600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000002","name":"National Institutes of Health","doi-asserted-by":"publisher","award":["1R01HL159436-05"],"award-info":[{"award-number":["1R01HL159436-05"]}],"id":[{"id":"10.13039\/100000002","id-type":"DOI","asserted-by":"publisher"}]},{"award":["1R01HL159436-05"],"award-info":[{"award-number":["1R01HL159436-05"]}],"id":[{"id":"https:\/\/ror.org\/01cwqze88","id-type":"ROR","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Dev. Biol.","JDB"],"abstract":"<jats:p>Barth syndrome (BTHS) is a rare, X-linked genetic disorder caused by mutations in the enzyme TAFAZZIN (TAZ), resulting in insufficient cardiolipin (CL) remodeling and mitochondrial dysfunction. While BTHS respiratory distress and breathing difficulties are commonly reported, the precise role of intrinsic respiratory tissue vulnerabilities has only recently begun to be appreciated. Historically, BTHS respiratory distress is frequently attributed to secondary consequences like cardiomyopathy or generalized skeletal myopathy, leaving the intrinsic vulnerability of vital respiratory muscles poorly understood. Using a patient-tailored point mutant knock-in mouse model (TazPM) harboring a stable but enzymatically deficient TazD75H protein, we investigated the autonomous physiological and metabolic responses in the diaphragm and lungs. Contrary to the paradigm that respiratory muscles are unaffected, TazPM diaphragms exhibit structurally abnormal mitochondria and undergo a survival-critical, bifurcated compensatory remodeling response to prevent fatal respiratory failure under severe bioenergetic stress. The TazPM adaptive mechanism is orchestrated by chronic activation of the mitochondrial Integrated Stress Response (ISR) via the Gcn2\/eIF2\u03b1 signaling pathway. This stress pathway halts global translation to conserve cellular ATP at the expense of reduced NAD+ levels, while selectively upregulating defensive mitokines and metabolic sirtuins and structural muscle remodeling. Furthermore, the TazPM diaphragm transitions into a highly specialized, slow-twitch motor system that is expected to reduce the energy cost per contraction. Concurrently, despite TazPM lungs exhibiting structurally abnormal mitochondria, they resist generalized mitochondrial collapse despite ADP reduction, executing tissue-specific metabolic reprogramming and localized biochemical adaptations to sustain respiratory homeostasis.<\/jats:p>","DOI":"10.3390\/jdb14030040","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T10:10:33Z","timestamp":1788430233000},"page":"40","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Diaphragmatic Mitochondrial Myopathy in a Patient-Derived Mouse Model of Barth Syndrome"],"prefix":"10.3390","volume":"14","author":[{"given":"Kristen","family":"Tentler","sequence":"first","affiliation":[{"name":"Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, 1044 West Walnut Street, Indianapolis, IN 46202, USA"},{"name":"Division of Pediatric Pulmonology, Allergy and Sleep Medicine, Department of Pediatrics, Indiana University School of Medicine, 705 Riley Hospital Drive, Indianapolis, IN 46202, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"}]},{"given":"Paige L.","family":"Snider","sequence":"additional","affiliation":[{"name":"Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, 1044 West Walnut Street, Indianapolis, IN 46202, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Catalina","family":"Matias","sequence":"additional","affiliation":[{"name":"Indiana Center for Musculoskeletal Health, Department of Anatomy, Cell Biology & Physiology, Indiana University School of Medicine, 635 Barnhill Drive, Indianapolis, IN 46202, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3503-0528","authenticated-orcid":false,"given":"Jeffrey J.","family":"Brault","sequence":"additional","affiliation":[{"name":"Indiana Center for Musculoskeletal Health, Department of Anatomy, Cell Biology & Physiology, Indiana University School of Medicine, 635 Barnhill Drive, Indianapolis, IN 46202, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"methodology","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5593-9259","authenticated-orcid":false,"given":"Simon J.","family":"Conway","sequence":"additional","affiliation":[{"name":"Herman B. Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, 1044 West Walnut Street, Indianapolis, IN 46202, USA"}],"role":[{"vocabulary":"crossref","role":"author"},{"role":"conceptualization","vocabulary":"credit"},{"role":"methodology","vocabulary":"credit"},{"role":"validation","vocabulary":"credit"},{"role":"formal-analysis","vocabulary":"credit"},{"role":"investigation","vocabulary":"credit"},{"role":"resources","vocabulary":"credit"},{"role":"data-curation","vocabulary":"credit"},{"role":"writing-original-draft","vocabulary":"credit"},{"role":"writing-review-editing","vocabulary":"credit"},{"role":"visualization","vocabulary":"credit"},{"role":"supervision","vocabulary":"credit"},{"role":"project-administration","vocabulary":"credit"},{"role":"funding-acquisition","vocabulary":"credit"}]}],"member":"1968","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"327","DOI":"10.1016\/0022-510X(83)90209-5","article-title":"An X-linked mitochondrial disease affecting cardiac muscle, skeletal muscle and neutrophil leucocytes","volume":"62","author":"Barth","year":"1983","journal-title":"J. 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