North American Mitochondrial Disease Consortium Patient Registry and Biorepository (NAMDC)

Inclusion Criteria: * Patients diagnosed with or suspected to have a mitochondrial disorder * Adult carriers of known mitochondrial DNA mutations * Patients with laboratory analysis indicative of a mitochondrial disorder. * Medical information and tissue samples are also accepted from deceased individuals who fulfill the above criteria. Exclusion Criteria: * Patients not suspected of having a mitochondrial disorder * Patients not suspected of carrying a mitochondrial DNA or nuclear DNA mutation that affects mitochondrial function.