On the occasion of King Frederik X of Denmark's 57th birthday, an adorable long-haired surprise guest crept into the official ...

Patients with rare mitochondrial diseases already face a host of serious health issues, from muscle weakness to neurological problems and heart conditions.

A discovery at The Jackson Laboratory reveals how dysfunctional mitochondria put the immune system on overdrive, leading to ...

Two weeks after Prince Frederik of Luxembourg died from POLG, a documentary filmmaker has revealed that the 22-year-old struggled to "get up by himself" as he battled the rare genetic disorder in ...

The filmmaker who chronicled Prince Frederik of Luxembourg’s battle with the rare genetic disorder PolG has shared her experience working with the royal, who passed away on Mar. 1 at 22.

Affected populations: POLG-related diseases are a group of rare, incurable conditions caused by inherited gene mutations. These disease-causing mutations are carried by up to 2% of people of ...

The son of Prince Robert of Luxembourg and Princess Julie of Nassau, Prince Frederik, has died in Paris the age of 22 due to ...

Grand Ducal Family of Luxembourg/Instagram Prince Frederik of Luxembourg spoke about his PolG diagnosis and what brought him solace in an emotional video that has resurfaced following his death ...

Prince Frederik of Luxembourg died on Feb. 28 after years ... Frederik was born with PolG disease, a genetic mitochondrial disorder that prevents the body’s cells from producing adequate energy ...