home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
CD-ROM Today (UK) (Spanish) 15
/
CDRT.iso
/
dp
/
0396
/
03967.txt
< prev
next >
Wrap
Text File
|
1994-01-17
|
7KB
|
166 lines
$Unique_ID{BRK03967}
$Pretitle{}
$Title{Marcus Gunn Phenomenon}
$Subject{Marcus Gunn Phenomenon Jaw-winking Maxillopalpebral Synkinesis Marcus
Gunn Ptosis with jaw-winking Marcus Gunn Syndrome Facial Nerve Injury
Marin-Amat Syndrome Inverse Marcus Gunn Phenomenon Oral-Facial-Digital
Syndrome Faciopalpebral Synkinesis }
$Volume{}
$Log{}
Copyright (C) 1991 National Organization for Rare Disorders, Inc.
833:
Marcus Gunn Phenomenon
** IMPORTANT **
It is possible that the main title of the article (Marcus Gunn
Phenomenon) is not the name you expected. Please check the SYNONYM listing
to find the alternate names and disorder subdivisions covered by this
article.
Synonyms
Jaw-winking
Maxillopalpebral Synkinesis
Marcus Gunn Ptosis (with jaw-winking)
Marcus Gunn (Jaw-Winking) Syndrome
Information on the following disorders can be found in the Related
Disorders section of this report:
Facial Nerve Injury
Marin-Amat Syndrome (Inverse Marcus Gunn Phenomenon)
Oral-Facial-Digital Syndrome
Faciopalpebral Synkinesis
General Discussion
** REMINDER **
The information contained in the Rare Disease Database is provided for
educational purposes only. It should not be used for diagnostic or treatment
purposes. If you wish to obtain more information about this disorder, please
contact your personal physician and/or the agencies listed in the "Resources"
section of this report.
Marcus Gunn Phenomenon is a rare genetic disorder that is usually present
at birth. Major symptoms include the upper eyelid of one eye raising rapidly
upon movement of the jaw. This disorder can be corrected with surgery.
Symptoms
The upper eyelid of one eye droops in most patients with Marcus Gunn
Phenomenon. The major symptom of this disorder is that upon movement of the
lower jaw, the eyelid of the affected eye involuntarily and rapidly raises,
causing the eye to open wider. This first becomes apparent soon after the
baby is born when, during feeding, sucking causes the eyelid to move up and
down. In some patients, one eye may be either crossed or looking away; i.e.,
deviates in a different direction from the normal eye (strabismus), or one
eye may have better sight than the other. Other eye problems (anisometropia,
superior rectus muscle palsy) may also be present.
Causes
Marcus Gunn Phenomenon may be inherited as an autosomal dominant trait.
Human traits, including the classic genetic diseases, are the product of the
interaction of two genes, one received from the father and one from the
mother. In dominant disorders a single copy of the disease gene (received
from either the mother or father) will be expressed "dominating" the other
normal gene and resulting in appearance of the disease. The risk of
transmitting the disorder from affected parent to offspring is fifty percent
for each pregnancy regardless of the sex of the resulting child.
Affected Population
Marcus Gunn Phenomenon is a rare genetic disorder present at birth. It
affects males and females in equal numbers.
Related Disorders
Marcus Gunn Phenomenon may occur in conjunction with certain other eye
disorders such as Duane Syndrome, or possibly Retinitis Pigmentosa. (For
more information on these disorders, choose "Duane," or "Retinitis
Pigmentosa" as your search term in the Rare Disease Database).
Certain types of injury to the facial nerve may produce symptoms similar
to Marcus Gunn Phenomenon.
Marin-Amat Syndrome is similar to Marcus Gunn Phenomenon except that the
eye closes, rather than opens wider, when the jaw moves to open the mouth.
This disorder is also referred to as "Inverse Marcus Gunn Phenomenon."
Oral-Facial-Digital Syndrome is a rare genetic disorder. In patients
with Type III of this syndrome, upon movement of the lower jaw the eyelid
involuntarily and rapidly raises, causing the eye to open wider (jaw-
winking). More than the normal number of teeth are usually present. Other
major symptoms may include disturbances involving the nervous and muscle
(neuromuscular) systems, congenital (present at birth) malformations such as
cleft palate, other facial deformities, malformation of the hands and
feet, shortened limbs and various degrees of mental retardation. (For more
information on this disorder, choose "Oral-Facial-Digital" as your search
term in the Rare Disease Database).
Faciopalpebral Synkinesis is a rare disorder characterized by the upper
eyelid of one eye raising when the individual smiles.
Therapies: Standard
Surgery can correct the eyelid abnormalities of Marcus Gunn Phenomenon.
Genetic counseling may be of benefit for patients and their families. Other
related eye problems such as strabismus, amblyopia, etc., can be corrected
with eyeglasses, surgery and/or drugs.
Therapies: Investigational
Scientists are trying to identify the gene that causes Marcus Gunn
Phenomenon. Research and genetic studies are ongoing.
This disease entry is based upon medical information available through
June 1991. Since NORD's resources are limited, it is not possible to keep
every entry in the Rare Disease Database completely current and accurate.
Please check with the agencies listed in the Resources section for the most
current information about this disorder.
Resources
For more information on Marcus Gunn Phenomenon, please contact:
National Organization for Rare Disorders (NORD)
P.O. Box 8923
New Fairfield, CT 06812-1783
(203) 746-6518
NIH/National Eye Institute
9000 Rockville Pike
Bethesda, MD 20892
(301) 496-5248
For genetic information and genetic counseling referrals:
March of Dimes Birth Defects Foundation
1275 Mamaroneck Avenue
White Plains, NY 10605
(914) 428-7100
Alliance of Genetic Support Groups
35 Wisconsin Circle, Suite 440
Chevy Chase, MD 20815
(800) 336-GENE
(301) 652-5553
References
MENDELIAN INHERITANCE IN MAN, 9th Ed.: Victor A. McKusick; Johns Hopkins
University Press, 1990. Pp. 599.
AUDITORY BRAIN-STEM RESPONSES IN MARCUS GUNN PTOSIS. D. J. Creel, et
al.; Electroencephalogr Clin Neurophysiol (Jul 1984; issue 59 (4)). Pp. 341-
344.
LEVATOR SLING FOR MARCUS GUNN PTOSIS. S. M. Betharia and S. Kumar; Br J
Ophthalmol (Sep 1987; issue 71 (9)). Pp. 685-689.
THE MARCUS GUNN PHENOMENON. A REVIEW OF 71 CASES. S. G. Pratt, et al.;
Ophthalmology (Jan 1984; issue 91 (1)). Pp. 27-30.