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Due to their clinical and genetic heterogeneity, these diseases are difficult to diagnose. We have developed a targeted exome sequencing approach to improve our ability to properly diagnose mitochondrial diseases and apply it here to an individual patient. Our method targets mitochondrial DNA (mtDNA) and the exons of 1,600 nuclear genes involved in mitochondrial biology or Mendelian disorders with multi-system phenotypes, thereby allowing for simultaneous evaluation of multiple disease loci.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Case Presentation<\/jats:title>\n            <jats:p>Targeted exome sequencing was performed on a patient initially suspected to have a mitochondrial disorder. The patient presented with diabetes mellitus, diffuse brain atrophy, autonomic neuropathy, optic nerve atrophy, and a severe amnestic syndrome. Further work-up revealed multiple heteroplasmic mtDNA deletions as well as profound thiamine deficiency without a clear nutritional cause. Targeted exome sequencing revealed a homozygous c.1672C &gt; T (p.R558C) missense mutation in exon 8 of <jats:italic>WFS1<\/jats:italic> that has previously been reported in a patient with Wolfram syndrome.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Conclusion<\/jats:title>\n            <jats:p>This case demonstrates how clinical application of next-generation sequencing technology can enhance the diagnosis of patients suspected to have rare genetic disorders. Furthermore, the finding of unexplained thiamine deficiency in a patient with Wolfram syndrome suggests a potential link between <jats:italic>WFS1<\/jats:italic> biology and thiamine metabolism that has implications for the clinical management of Wolfram syndrome patients.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2350-13-3","type":"journal-article","created":{"date-parts":[[2012,1,6]],"date-time":"2012-01-06T19:24:04Z","timestamp":1325877844000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":33,"title":["Atypical case of Wolfram syndrome revealed through targeted exome sequencing in a patient with suspected mitochondrial disease"],"prefix":"10.1186","volume":"13","author":[{"given":"Daniel S","family":"Lieber","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Scott B","family":"Vafai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura C","family":"Horton","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nancy G","family":"Slate","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shangtao","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark L","family":"Borowsky","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sarah E","family":"Calvo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeremy D","family":"Schmahmann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vamsi K","family":"Mootha","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2012,1,6]]},"reference":[{"key":"910_CR1","doi-asserted-by":"publisher","first-page":"25","DOI":"10.1146\/annurev-genom-082509-141720","volume":"11","author":"SE Calvo","year":"2010","unstructured":"Calvo SE, Mootha VK: The mitochondrial proteome and human disease. 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