POLG and kidney disorder: In the mimics group, 5 of 6 (83.3%) patients had kidney diseases, including nephronophthisis type 11 with homozygous TMEM67 gene mutation at 1843T>C 2012, Alport syndrome with monoalleic POLG1 mutation, unilateral renal agenesis, nephrolithiasis, and nonspecific chronic cardiac and renal failure.