[Mitochondrial insufficiency in children]

Area of Science:

• Mitochondrial biology and pathology
• Genetics and molecular biology
• Organ system physiology

Context:

• Mitochondrial insufficiency affects numerous tissues including the nervous system, muscles, and organs like the liver and kidneys.
• Pathologies arise from mutations in mitochondrial or nuclear DNA.
• Disease variants can be symptomatic or secondary to other conditions.

Purpose:

• To characterize nosological and syndromic forms of mitochondrial pathology.
• To analyze disease variants with symptomatic or presumed mitochondrial involvement.
• To highlight diagnostic criteria for pathologists.

Summary:

• Structural and functional disturbances linked to mitochondrial insufficiency are prevalent in various body systems.
• Key diagnostic features for pathologists include specific skeletal muscle changes, notably the "ragged red fibres" phenomenon.
• Clinicobiochemical and morphological data comparison is crucial for accurate diagnosis.

Impact:

• Provides a comprehensive overview of mitochondrial pathology across different organ systems.
• Emphasizes the diagnostic significance of skeletal muscle morphology.
• Underscores the importance of integrating clinical, biochemical, and morphological findings for diagnosis.