Related Experiment Videos
[Mitochondrial medicine for internists]
1Abteilung Rheumatologie und Klinische Immunologie, Medizinische Universitätsklinik, Freiburg. walkerul@uni-freiburg.de
Abstract:
Human mitochondrial DNA (mtDNA) is a small, circular molecule, encoding for the translational machinery of the mitochondrion, as well as for 13 structural proteins that are all subunits of the respiratory chain. Point mutations, deletions, and copy-number variations are now functionally and genetically linked to human disease. Despite the fact that mtDNA is solely transmitted from the mother to the offspring, e.g. is maternally inherited, some mutations may occur spontaneously or may be acquired due to defects in nuclear DNA, e.g. are inherited in a mendelian fashion. The internist encounters predominantly myopathies, cardiomyopathies, lactic acidosis or diabetes mellitus but mtDNA-changes are also present with neurologic, hematologic and renal symptoms. Acquired mtDNA alterations are responsible for important drug side effects, such as ifosfamide, carboplatin, doxorubicin or nucleoside-analog reverse-transcriptase inhibitors. A specific mtDNA point-mutation predisposes to aminoglycoside-induced sensorineural deafness.
Insights
Human mitochondrial DNA (mtDNA) mutations cause various diseases and drug side effects. Understanding these genetic changes is crucial for diagnosing and treating mitochondrial disorders.
Area of Science:
- Genetics
- Molecular Biology
- Human Physiology
Context:
- Human mitochondrial DNA (mtDNA) encodes essential proteins for cellular respiration.
- mtDNA mutations, deletions, and copy-number variations are linked to human diseases.
- While typically maternally inherited, mtDNA alterations can also arise spontaneously or via nuclear DNA defects.
Purpose:
- To review the role of mitochondrial DNA (mtDNA) in human health and disease.
- To highlight the diverse clinical manifestations of mtDNA-related disorders.
- To discuss the impact of acquired mtDNA alterations on drug toxicity.
Summary:
- mtDNA mutations are implicated in myopathies, cardiomyopathies, lactic acidosis, diabetes, and neurological, hematologic, and renal conditions.
- Acquired mtDNA alterations contribute to adverse drug reactions from treatments like ifosfamide, carboplatin, doxorubicin, and nucleoside analogs.
- Specific mtDNA mutations confer susceptibility to drug-induced hearing loss, such as with aminoglycosides.
Impact:
- Provides a comprehensive overview of mtDNA's role in inherited and acquired human diseases.
- Emphasizes the clinical relevance of mtDNA analysis for internists and pharmacologists.
- Highlights the genetic basis of mitochondrial disorders and drug toxicities for improved patient care.