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Published on: February 10, 2023
Targeted exome sequencing of suspected mitochondrial disorders
Daniel S Lieber1, Sarah E Calvo, Kristy Shanahan
1Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA.
Neurology
|April 19, 2013
Summary
Targeted exome sequencing effectively diagnoses mitochondrial disorders, offering an alternative to sequential gene testing. This approach aids in identifying genetic causes of these complex diseases.
Area of Science:
- Genetics
- Molecular Biology
- Biochemistry
Background:
- Mitochondrial disorders are genetically heterogeneous, posing diagnostic challenges.
- Traditional diagnostic methods involve sequential testing of mitochondrial DNA (mtDNA) and nuclear genes.
- Phenotypic and biochemical overlap exists between mitochondrial disorders and other inborn errors of metabolism.
Observation:
- Targeted exome sequencing was performed on 102 patients with suspected mitochondrial disorders.
- The study sequenced the mitochondrial genome and 1,598 nuclear genes.
- Variants were prioritized for molecular diagnosis according to clinical guidelines.
Findings:
- Targeted exome sequencing achieved a 22% molecular diagnosis rate.
- New diagnoses involved genes for canonical mitochondrial disorders and other neurologic conditions.
- Functional studies in yeast provided evidence for pathogenicity of novel variants.
Implications:
- Targeted exome sequencing is an effective diagnostic strategy for mitochondrial disease.
- This method offers an alternative to sequential testing of mtDNA and nuclear genes.
- Variant interpretation remains a critical challenge in clinical genetic diagnostics.
