Pathogenic mitochondrial DNA mutations are common in the general population.

Area of Science:

• Genetics
• Mitochondrial Biology
• Human Health

Background:

• Mitochondrial DNA (mtDNA) mutations are linked to numerous genetic disorders.
• The prevalence of mtDNA mutations in the general population remains largely unknown.
• Understanding mutation frequency is crucial for assessing genetic disease risk.

Purpose of the Study:

• To determine the frequency of specific mtDNA point mutations in newborns.
• To estimate the de novo mutation rate of mtDNA.
• To identify common mtDNA mutations and their inheritance patterns.

Main Methods:

• Analysis of ten mitochondrial point mutations in 3168 neonatal-cord-blood samples.
• Comparison with matched maternal blood samples to detect de novo mutations.
• High-throughput sequencing and variant analysis.

Main Results:

• Mitochondrial DNA mutations were detected in 0.54% of newborns.
• The estimated de novo mutation rate was 0.00107%.
• The m.3243A-->G mutation was most frequent; m.14484T-->C was specific to mtDNA haplogroup J.

Conclusions:

• At least one in 200 healthy individuals harbors a pathogenic mtDNA mutation.
• mtDNA mutations can be transmitted from mothers and cause disease in offspring.
• Background mtDNA haplotype may influence mutagenesis, emphasizing the need for transmission prevention strategies.