Oculopharyngeal muscular dystrophy

[5][3] In terms of the signs (and symptoms) of oculopharyngeal muscular dystrophy would be consistent with the following:[2][6] Though the aforementioned signs/symptoms are the most common, there have been cases though rare, where the peripheral nervous system has had involvement with significant reduction of myelinated fibers [2] In homozygous cases, this muscular dystrophy is severe and starts earlier in the affected individual's life.

This gene suffers mutations that cause the PABPN1 protein to have extra alanine (amino acids), and this manifests itself physically in the symptoms of this MD.

[4] The diagnosis of oculopharyngeal muscular dystrophy can be done via two methods, a muscle biopsy or a blood draw with genetic testing for GCG trinucleotide expansions in the PABPN1 gene.

Cutting one of the throat muscles internally, an operation called cricopharyngeal myotomy, can be one way to ease symptoms in more severe cases.

[9][10] As the dysphagia becomes more severe, patients become malnourished, lose significant weight, become dehydrated and suffer from repeated incidents of aspiration pneumonia.

Lateral rectus Trochlea of superior oblique Superior oblique Superior oblique Superior rectus Superior rectus Superior rectus Oculomotor nerve Oculomotor nerve Optic nerve Optic nerve Optic nerve Annulus of Zinn Inferior oblique Inferior rectus Inferior rectus Medial rectus Optic nerve Optic nerve Optic nerve Optic nerve Medial rectus Medial rectus Ciliary ganglion Oculomotor nerve Globe (human eye) Iris Pupil Anterior chamber Lateral rectus Levator palpebrae superioris muscle Superior oblique Superior oblique Optic nerve Medial rectus Orbit Orbit Orbit
Extraocular muscles are shown in this image of the left eye (lateral view). Click on the structures for more information.
PABN1