How is MPS II inherited?

How is MPS II inherited?

MPS II is inherited in an X-linked recessive pattern, which means that this conditions occurs almost exclusively in males. Females are generally unaffected carriers of this condition. In a family with more than one affected individual, the mother of the affected males must be a carrier.

What clinical symptoms are characteristic of Mucopolysaccharidosis type 2 Hunter syndrome?

Recurrent upper respiratory infections, a chronic runny nose, hearing impairment, liver and spleen enlargement, inguinal and abdominal hernias, joint stiffness and multiplex dysplasia, compression of tendons in the wrist (carpal tunnel syndrome), and joint stiffness which can result in reduction of hand function.

What is the mechanism of mucopolysaccharidosis type II MPS II )?

Mucopolysaccharidosis type II (MPS II), also known as Hunter syndrome, is a member of a group of inherited metabolic disorders collectively termed the mucopolysaccharidoses (MPSs). The MPSs are caused by a deficiency of lysosomal enzymes required for the degradation of mucopolysaccharides or glycosaminoglycans (GAGs).

What is the life expectancy of a person with Hunter syndrome?

No cure is available for Hunter syndrome. The most severe cases can be life-threatening, with life expectancy typically between 10 and 20 years. People with mild cases of the disease typically live longer into adulthood.

How is Niemann Pick disease inherited?

The Niemann-Pick gene mutations are passed from parents to children in a pattern called autosomal recessive inheritance. This means that both the mother and the father must pass on the defective form of the gene for the child to be affected. Niemann-Pick is a progressive disease, and there is no cure.

What are the symptoms of mucopolysaccharidosis?


  • Enlarged head, lips, cheeks, tongue, and nose.
  • Enlarged vocal cords, resulting in a deep voice.
  • Frequent upper respiratory infections.
  • Sleep apnea.
  • Hydrocephalus.
  • Hepatosplenomegaly (enlarged liver and spleen)
  • Umbilical hernia.
  • Inguinal hernia.

What are the symptoms of Hunter syndrome?

Signs and symptoms may include:

  • An enlarged head.
  • Thickening of the lips.
  • A broad nose and flared nostrils.
  • A protruding tongue.
  • A deep, hoarse voice.
  • Abnormal bone size or shape and other skeletal irregularities.
  • A distended abdomen, as a result of enlarged internal organs.
  • Chronic diarrhea.

How many types of mucopolysaccharidosis are there?

Seven distinct clinical types and numerous subtypes of the mucopolysaccharidoses have been identified. Although each mucopolysaccharidosis (MPS) differs clinically, most individuals experience a period of normal development followed by a decline in physical and/or mental function.

What type of mutation causes Hunter syndrome?

Hunter syndrome, also known as mucopolysaccharidosis type II (MPS II), is a rare X-linked recessive disorder caused by deficiency of the lysosomal enzyme iduronate-2-sulfatase (IDS gene—OMIM 309900), leading to progressive accumulation of glycosaminoglycans (Neufeld and Muenzer, 1995; Wraith et al., 2008; Roberts et al …

Is Hunter syndrome curable?

The condition is one type of a group of inherited metabolic disorders called mucopolysaccharidoses (MPSs). Hunter syndrome is also known as MPS II. There’s no cure for Hunter syndrome. Treatment involves managing symptoms and complications.

How long do children with Sanfilippo live?

Children who have this genetic error of metabolism show no signs at birth. As the disease progresses, they slowly lose the ability to speak, walk, and eat. There’s no cure for Sanfilippo syndrome. The current life expectancy is 10 to 20 years.

When does mucopolysaccharidosis type II ( MPS II ) first appear?

Mucopolysaccharidosis type II (MPS II) is a rare inborn error of metabolism that affects every organ of the body. Although the age of onset, disease severity and the rate of progression of the disease vary significantly, initial symptoms and findings associated with MPS II usually become apparent in children from two to four years of age.

What kind of genetic disorder is Hunter syndrome?

Jump to navigation Jump to search. Hunter syndrome, or mucopolysaccharidosis type II (MPS II), is a rare genetic disorder in which large sugar molecules called glycosaminoglycans (AKA GAGs, or mucopolysaccharides) build up in body tissues.

How is Hunter syndrome a form of lysosomal storage disease?

It is a form of lysosomal storage disease. Hunter syndrome is caused by a deficiency of the lysosomal enzyme iduronate-2-sulfatase (I2S). The lack of this enzyme causes heparan sulfate and dermatan sulfate to accumulate in all body tissues. Hunter syndrome is the only MPS syndrome to exhibit X-linked recessive inheritance.

How is dermatan sulfate related to Hunter syndrome?

Dermatan sulfate is one of the GAGs that build up in the tissues of people with MPS II. The human body depends on a vast array of biochemical reactions to support critical functions. One of these functions is the breakdown of large biomolecules. The failure of this process is the underlying problem in Hunter syndrome and related storage disorders.