India, March 13 -- 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 an interview with Us Weekly.

POLG or DNA polymerase subunit gamma is a genetic disorder affects 1 in 5,000 people and drains the body's cells of energy leading to multiple organ dysfunction and failure.

Director Mei Fa Tan filmed Frederik's battle with the disease for a short film commissioned by his mother, Princess Julia of Nassau, to help educate the people about the disease. The director said that while she was "inspired" by the young prince, she also found it "painful to watch" him struggle.

The prince's foundation rele...