Progressive External Ophthalmoplegia with Mitochondrial Dna Deletions, Autosomal Recessive 2, also known as adult-onset chronic progressive external ophthalmoplegia with mitochondrial myopathy, is related to mitochondrial dna depletion syndrome 6 and mitochondrial dna depletion syndrome. An important gene associated with Progressive External Ophthalmoplegia with Mitochondrial Dna Deletions, Autosomal Recessive 2 is RNASEH1 (Ribonuclease H1). Affiliated tissues include eye and skeletal muscle, and related phenotypes are progressive external ophthalmoplegia and limb muscle weakness