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The Dimensions of Primary Mitochondrial Disorders
Lea D Schlieben1,2, Holger Prokisch1,2
1School of Medicine, Institute of Human Genetics, Technical University of Munich, Munich, Germany.
Frontiers in Cell and Developmental Biology
|December 16, 2020
Summary
Mitochondrial disorders, initially defined by altered energy metabolism, are now understood to involve complex genetics. Diagnosis has shifted from biochemical tests to genetic sequencing, revealing numerous disease-associated genes.
Area of Science:
- Genetics
- Biochemistry
- Molecular Biology
Background:
- Mitochondrial disorders were first described in 1962, linked to impaired energy metabolism.
- Defective oxidative phosphorylation is a key feature, but diagnosis was limited by biochemical methods.
- Genetic complexity, involving both mitochondrial and nuclear DNA, underlies diverse mitochondrial dysfunctions.
Purpose of the Study:
- To review mitochondrial disease-associated genes.
- To discuss the challenges in defining and diagnosing mitochondrial disorders.
- To highlight the evolution of diagnostic approaches.
Main Methods:
- Review of historical and current diagnostic criteria for mitochondrial disorders.
- Analysis of the impact of next-generation sequencing (NGS) on molecular diagnosis.
- Examination of gene lists and criteria for classifying mitochondrial disease genes.
Main Results:
- Diagnosis has transitioned from biochemical assays to genetic variant detection.
- NGS has been crucial in identifying novel mitochondrial disease genes.
- There is no universal definition for mitochondrial disorders, leading to varied gene lists (270-400+ genes).
Conclusions:
- The molecular era has revolutionized mitochondrial disease diagnosis.
- Challenges remain in standardizing definitions and gene identification.
- Understanding the genetic basis is key to advancing diagnosis and treatment.
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