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Revisiting mitochondrial diagnostic criteria in the new era of genomics

Lookup NU author(s): Professor Rita Horvath


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© 2018 American College of Medical Genetics and Genomics. Purpose: Diagnosing primary mitochondrial diseases (MDs) is challenging in clinical practice. The mitochondrial disease criteria (MDC) have been developed to quantify the clinical picture and evaluate the probability of an underlying MD and the need for a muscle biopsy. In this new genetic era with next-generation sequencing in routine practice, we aim to validate the diagnostic value of MDC. Methods: We retrospectively studied MDC in a multicenter cohort of genetically confirmed primary MD patients. Results: We studied 136 patients (61 male, 91 nuclear DNA (nDNA) mutations). Forty-five patients (33%) had probable MD and 69 (51%) had definite MD according to the MDC. A muscle biopsy was performed in 63 patients (47%). Patients with nDNA mutations versus mitochondrial DNA mutations were younger (6.4 ± 9.7 versus 19.5 ± 17.3 y) and had higher MDC (7.07 ± 1.12/8 versus 5.69 ± 1.94/8). At a cutoff of 6.5/8, the sensitivity to diagnose patients with nDNA mutations is 72.5% with a positive predictive value of 69.5%. In the nDNA mutation group, whole-exome sequencing could diagnose patients with lower scores (MDC (6.84 ± 1.51/8) compared to Sanger sequencing MDC (7.44 ± 1.13/8, P = 0.025)). Moreover 7/8 patients diagnosed with possible MD by MDC were diagnosed by whole-exome sequencing. Conclusion: MDC remain very useful in the clinical diagnosis of MD, in interpreting whole-exome results and deciding on the need for performing muscle biopsy.

Publication metadata

Author(s): Witters P, Saada A, Honzik T, Tesarova M, Kleinle S, Horvath R, Goldstein A, Morava E

Publication type: Article

Publication status: Published

Journal: Genetics in Medicine

Year: 2018

Volume: 20

Issue: 4

Pages: 444-451

Print publication date: 01/04/2018

Online publication date: 26/10/2017

Acceptance date: 19/06/2017

ISSN (print): 1098-3600

ISSN (electronic): 1530-0366

Publisher: Nature Publishing Group


DOI: 10.1038/gim.2017.125


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