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• Occasionally CPEO may be caused by conditions other than mitochondrial diseases.
• Center for Public Environmental Oversight http : / / www . cpeo . org
• CPEO is diagnosed via muscle biopsy.
• It is often the only feature of mitochondrial disease, in which case the term CPEO may be given as the diagnosis.
• This mutation is associated with both CPEO and Mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes ( MELAS ).
• Many of these sites are detailed and updated by www . cpeo . org and include a former ammunition plant in the Twin Cities area.
• One study showed that mtDNA deletion seen in CPEO patients also had an associated nuclear DNA deletion of the Twinkle gene which encodes specific mitochondrial protein; Twinkle.
• In other people suffering from mitochondrial disease, CPEO occurs as part of a syndrome involving more than one part of the body, such as Kearns-Sayre syndrome.
• Multiple mtDNA abnormalities exist which cause CPEO . One mutation is located in a conserved region of mitochondrial tRNA at nucleotide 3243 in which there is an A to G nucleotide transition.
• Pearson syndrome consists of mtDNA deletions that differs in size and location compared to other mtDNA disorders such as chronic progressive ophthalmoplegia ( CPEO ) and Kearns-Sayre syndrome ( KSS ).
• MRI may be helpful in the diagnosis, in one study volumes of medial rectus, lateral rectus, and inferior rectus muscles in CPEO were not smaller than normal ( in contrast to the profound atrophy typical of neurogenic paralysis ).
• Ptosis associated with CPEO may be corrected with surgery to raise the lids, however due to weakness of the orbicularis oculi muscles, care must be taken not to raise the lids in excess causing an inability to close the lids.
• "' Chronic progressive external ophthalmoplegia "'( CPEO ), also known as "'progressive external ophthalmoplegia "'( PEO ), is a type of eye disorder characterized by slowly progressive inability to move the eyes and eyebrows.
• Weakness of extraocular muscle groups including, the orbicularis oculi muscle as well as facial and limb muscles may be present in up to 25 % of patients with CPEO . As a result of the orbicularis oculi weakness, patients may suffer from exposure keratopathy ( damage to cornea ) from the inability to close the eyes tightly.
• Thirteen other syndromes may exhibit signs similar to Usher syndrome, including Alport syndrome, Alstrom syndrome, Bardet-Biedl syndrome, Cockayne syndrome, spondyloepiphyseal dysplasia congenita, Flynn-Aird syndrome, Friedreich ataxia, Hurler syndrome ( MPS-1 ), Kearns-Sayre syndrome ( CPEO ), Norrie syndrome, osteopetrosis ( Albers-Schonberg disease ), Refsum's disease ( phytanic acid storage disease ), and Zellweger syndrome ( cerebrohepatorenal syndrome ).