Mitochondrial DNA Content (qPCR) Analysis - Skeletal Muscle

Casandra

Casandra Test Code BA25739Version 1 (DRAFT)

Performing Lab

Lab Baylor GeneticsLab Test ID 3700CPT Code 81479

Mitochondrial DNA Content (qPCR) Analysis - Skeletal Muscle

Clinical Use

Use

The Mitochondrial DNA (mtDNA) Content Quantification - Muscle determines if mtDNA depletion is present, helping to select causative nuclear genes for sequence analysis. Mitochondrial DNA depletion syndromes present a variety of symptoms including hypotonia, lactic acidemia, and myopathy. Identifying mtDNA depletion can aid in diagnosing mitochondrial DNA depletion syndromes, which are diverse and genetic, with at least ten known nuclear genes contributing to these conditions. Early detection is crucial for managing potential energy production issues in affected tissues, particularly in infants who may exhibit severe symptoms of energy deficiencies.

Special Instructions

This test requires a sample of skeletal muscle, which must be collected and processed in a specific manner to ensure accurate results. The skeletal muscle should be flash frozen in liquid nitrogen immediately upon collection, with no media added, and subsequently stored at -80°C. Shipping should occur via overnight courier using dry ice to maintain the integrity of the specimen. Prior to collection, healthcare providers must inform patients about the importance of the timely processing of the specimen to avoid degradation.

Limitations

The test may not identify all known variants associated with mtDNA depletion syndromes, and results should be correlated with clinical findings for accurate interpretation. The sensitivity of the assay is dependent on the quality of the specimen collected. The analysis only quantifies mtDNA content; it does not sequence nuclear genes or identify specific mutations that may lead to mtDNA depletion. Limited understanding of novel mtDNA syndromes could impact diagnosis unless further genetic testing wades into unchartered genetic territories.

Test Details