home *** CD-ROM | disk | FTP | other *** search
- $Unique_ID{BRK04143}
- $Pretitle{}
- $Title{Pseudo-Hurler Polydystrophy}
- $Subject{Pseudo-Hurler Polydystrophy Pseudo-Polydystrophy Pseudopolydystrophy
- Mucolipidosis III ML III ML Disorder Gangliosidosis GM1 Type 1 GLB1
- Mucopolysaccharidosis VII Sandhoff Disease Gangliosidosis GM2 Type 2 Tay Sachs
- Disease GM2 Type 1}
- $Volume{}
- $Log{}
-
- Copyright (C) 1986, 1988, 1990 National Organization for Rare Disorders, Inc.
-
- 303:
- Pseudo-Hurler Polydystrophy
-
- ** IMPORTANT **
- It is possible the main title of the article (Pseudo-Hurler
- Polydystrophy) is not the name you expected. Please check the SYNONYMS
- listing to find the alternate names and disorder subdivisions covered by this
- article.
-
- Synonyms
-
- Pseudo-Polydystrophy
- Pseudopolydystrophy
- Mucolipidosis III
- ML III
- ML Disorder
- Gangliosidosis GM1 Type 1
- GLB1
- Mucopolysaccharidosis VII
-
- Information on the following diseases can be found in the Related
- Disorders section of this report:
-
- Sandhoff Disease (Gangliosidosis GM2 Type 2)
- Tay Sachs Disease (GM2 Type 1)
-
- 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.
-
-
- The Mucolipidoses are a family of hereditary disorders in which enzyme
- deficiencies cause both complex carbohydrates (mucopolysaccharides) and
- certain fatty substances (mucolipids) to accumulate in body tissues without
- excess mucopolysaccharides in the urine. (For more information on the
- mucolipidoses, choose "ML Disorder" as your search term in the Rare Disease
- Database.)
-
- Pseudo-Hurler Polydystrophy (Mucolipidosis III) is an autosomal recessive
- inherited disorder, characterized by childhood onset, painless joint
- stiffness, decreased mobility, short stature, some coarseness of the facial
- features, mild mental retardation, evidence of multiple defective bone
- formations (dysostosis multiplex), and aortic valve disease. Pseudo-Hurler
- polydystrophy is, in general, a milder form of I-cell disease (ML II). (For
- more information, choose "I-cell" as your search term in the Rare Disease
- Database.)
-
- Symptoms
-
- Pseudo-Hurler Polydystrophy is caused by excess accumulations of ganglioside
- in cells called histiocytes. The gangliosides affect the central nervous
- system, liver, spleen, and kidneys (renal glomerular epithelium), bone, and
- other tissues. This type of mucolipidosis is characterized by childhood
- onset of joint stiffness without pain, swelling or tenderness. Limitation of
- mobility is slowly progressive but seems to become stationary after puberty.
- Stature is short. Other characteristics are minimal to moderate coarseness
- of the facial features, and opacities of the eye's cornea. Mild mental
- retardation may also occur.
-
- Blood flowing back from the aorta into the heart (aortic regurgitation)
- has been observed in several cases.
-
- The urinary excretion of acid mucopolysaccharides is normal. Easy
- fatigability and congestive heart failure may sometimes occur.
-
- Compression of the "tunnel" in the wrist through which nerves and tendons
- pass (the carpal tunnel) may be present by late childhood. Disease of the
- valves of the aorta is common. Survival to age 50 years is known but there
- is little information available on the course of the disorder during
- adulthood.
-
- Mucolipodosis III (Pseudo-Hurler Polydystrophy) has a similar clinical
- involvement compared to Mucopolysaccharidosis VI.
-
- Causes
-
- Pseudo-Hurler Polydystrophy is an autosomal recessive inherited disorder in
- which multiple lysosomal enzymes are deficient. (Human traits including the
- classic genetic diseases, are the product of the interaction of two genes for
- that condition, one received from the father and one from the mother. In
- recessive disorders, the condition does not appear unless a person inherits
- the same defective gene from each parent. If one receives one normal gene
- and one gene for the disease, the person will be a carrier for the disease,
- but usually will show no symptoms. The risk of transmitting the disease to
- the children of a couple, both of whom are carriers for a recessive disorder,
- is twenty-five percent. Fifty percent of their children will be carriers,
- but healthy as described above. Twenty-five percent of their children will
- receive both normal genes, one from each parent and will be genetically
- normal.)
-
- Affected Population
-
- Pseudo-Hurler Polydystrophy affects males as often as females. Siblings of
- patients with this disorder have a 1 in 4 chance of being affected.
-
- Related Disorders
-
- Sandhoff Disease Sandhoff Disease (Gangliosidosis GM2 Type 2) is an inherited
- disorder. A severe variant of Tay Sachs Disease, it is not restricted to
- people of Eastern Jewish heritage. (For more information on this disorder,
- choose "Sandhoff" as your search term in the Rare Disease Database.
-
- Tay Sachs Disease (Amaurotic Familial Idiocy; Gangliosidosis GM2 Type I)
- is a hereditary disorder in children. It is characterized by progressive
- destruction of the central nervous system. It is generally found among
- children with Eastern European Jewish heritage. Symptoms become apparent at
- about six months of age. (For more information on this disorder, choose "Tay
- Sach" as your search term in the Rare Disease Database.)
-
- Therapies: Standard
-
- Treatment of Pseudo-Hurler Polydystrophy is symptomatic and supportive.
- Orthopedic care may be provided when needed. Genetic counseling services
- will be useful to patient and family.
-
- Therapies: Investigational
-
- This disease entry is based upon medical information available through March
- 1990. 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 Pseudo-Hurler Polydystrophy, please contact:
-
- National Organization for Rare Disorders (NORD)
- P.O. Box 8923
- New Fairfield, CT 06812-1783
- (203) 746-6518
-
- MPS (Mucopolysaccharidoses) Research Funding Center, Inc.
- 1215 Maxfield Road
- Hartland, MI 48029
- (313) 363-4412
-
- The MPS Society, Inc.
- 17 Kramer Street
- Hicksville, NY 11801
- (516) 931-6338
-
- Society of Mucopolysaccharide Diseases, Inc.
- 382 Parkway Blvd.
- Flin Flon, Manitoba, Canada R8A OK4
-
- Society of MPS Diseases
- 30 Westwood Drive
- Little Chalfont, Bucks, England
-
- National Digestive Diseases Information Clearinghouse
- Box NDDIC
- Bethesda, MD 20892
- (301) 468-6344
-
- For genetic information and genetic counseling referrals, please contact:
-
- 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
-
- BIRTH DEFECTS COMPENDIUM, 2nd ed.: Daniel Bergsma, ed; March of Dimes, 1979.
- P. 726.
-
- MENDELIAN INHERITANCE IN MAN, 6th ed.: Victor A. McKusick; Johns Hopkins
- University Press, 1983. Pp. 835-836.
-
-