Mitochondrial DNA disorders: from pathogenic variants to preventing transmission

Area of Science:

• Genetics
• Metabolic Disorders
• Mitochondrial Biology

Background:

• Mitochondrial DNA (mtDNA) disorders are a leading cause of inherited metabolic diseases.
• Pathogenic mtDNA variants can be homoplasmic or heteroplasmic, leading to biochemical defects when exceeding a threshold.
• Dynamic variant segregation and tissue-specific mosaicism complicate disease presentation.

Purpose of the Study:

• To review the genetic complexities of mitochondrial DNA disorders.
• To discuss challenges in diagnosis and clinical management.
• To highlight current research in therapeutic and reproductive strategies.

Main Methods:

• Review of scientific literature on mitochondrial DNA disorders.
• Analysis of genetic transmission patterns and biochemical thresholds.
• Examination of current and emerging therapeutic and reproductive technologies.

Main Results:

• mtDNA disorders exhibit complex inheritance due to heteroplasmy and maternal transmission bottlenecks.
• Phenotypic variation is significant, influenced by variant levels, tissue distribution, and nuclear-mitochondrial interactions.
• Effective disease-modifying therapies are still under investigation, with assisted reproductive technologies offering new but challenging options.

Conclusions:

• Understanding the intricate genetics of mtDNA disorders is crucial for diagnosis and management.
• Further research is needed to elucidate disease mechanisms and identify novel therapeutic targets.
• Genetic counseling and advanced reproductive techniques are vital for affected women.