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.