Mitochondrial DNA pathogenic mutations in multiple symmetric lipomatosis

Area of Science:

• Genetics
• Mitochondrial Biology
• Dermatology

Background:

• Dermatological manifestations in mitochondrial DNA (mtDNA) diseases are poorly understood.
• Multiple symmetric lipomatosis (MSL) has been linked to mtDNA mutations, but the precise relationship is unclear.

Purpose of the Study:

• To investigate the association between dermatological signs, specifically MSL, and mtDNA mutations.
• To identify and characterize a novel mtDNA mutation in a patient with MSL and other skin conditions.

Main Methods:

• Case presentation of a patient with MSL and skin signs.
• Identification of a new mtDNA mutation (m.8357T>C) in the tRNA^Lys gene.
• Pathogenicity confirmation using a cybrid approach.
• Meta-analysis of dermatological signs in patients with mtDNA mutations.

Main Results:

• A novel mtDNA mutation, m.8357T>C, was identified in the tRNA^Lys gene.
• The cybrid approach confirmed the pathogenicity of this mutation.
• Dermatological signs observed in the patient are not typically associated with known mtDNA mutations.

Conclusions:

• The identified mtDNA mutation suggests a potential link between tRNA alterations and MSL.
• Lipomatosis in these cases may arise from an additional function of mitochondrial tRNAs, independent of oxidative phosphorylation dysfunction.