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.