Turner Syndrome

Turner syndrome is caused by a missing or incomplete X chromosome. People who have Turner syndrome develop as females. The genes affected are involved in growth and sexual development, which is why girls with the disorder are shorter than normal and have abnormal sexual characteristics.

Symptoms:

There are many different physical features associated with Turner syndrome. Not all girls have all symptoms, and in many cases the signs are hard to detect. Girls with Turner syndrome may have:

short stature (affects almost all girls with Turner, to different degrees)
failure of ovaries to develop (90-95% of girls)
webbed neck (25%) or short neck (40%)
abnormal fingernails and toenails (70%)
low hairline at neck (40%)
heart defect (30%)
kidney or urinary tract defect (30%)
hearing disorders (50-90%)
frequent ear infections in childhood (75%)
shortening of bones in the hands (35%)
lower jaw smaller than normal (60%)
drooping eyelids (ptosis), wandering eyes (strasbismus)

Girls and women with Turner syndrome have normal intelligence but often have learning problems that lead to difficulty with math and spatial relationships between objects.

Diagnosis:

If a physician suspects a girl may have Turner syndrome because she is not growing at a normal rate, and perhaps has one or more of the other signs of the syndrome, a chromosome analysis will be done. Finding the specific chromosome problem of the syndrome is the only definitive diagnosis.

Treatment:

There are two main medications given to girls with Turner syndrome. One is human growth hormone, used to increase the girl's growth rate and help her be taller. The other medication is estrogen, a female hormone, to replace the estrogen which would normally have been produced by the ovaries. Another female hormone, progesterone, is also given when the girl grows older, to help her have a normal monthly menstrual cycle.

Since a girl with Turner syndrome usually does not have ovaries, she cannot produce eggs and become pregnant when she grows up. However, some women with Turner syndrome can use in vitro fertilization to become pregnant, using donated eggs. Other women choose to adopt children in order to have a family.


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Werner Syndrome

Werner syndrome, also known as progeria of the adult, is the most common of the premature aging disorders. Werner syndrome is inherited as an autosomal recessive disorder of chromosome 8, meaning that a defective gene is inherited from each parent. The syndrome is estimated to occur in 1 in 1 million individuals. Higher incidences of Werner syndrome have been reported in Japan and Sardinia. It affects both males and females.

Symptoms
Werner syndrome may begin in adolescence, but most often it begins in the mid-30s. Up until symptoms begin, the individual has healthy normal development. Once the disease process begins, the individual's body begins to age faster than normal. This produces symptoms such as:

Wrinkling and sagging of the face
Decreasing muscle mass
Thin skin and loss of fat under the skin
Graying hair and hair loss
A high-pitched voice

Along with the physical appearance of aging, body organs and systems also begin to age. This produces diseases such as:

Cataracts (cloudy spots on the lens of the eye)
Osteoporosis (weakened bones)
Diabetes (type 2)
Rare cancers such as thyroid cancer, lymphoma, and sarcoma
Heart and artery disease
Premature menopause in females.

Diagnosis and treatment
Diagnosis of Werner syndrome is based on physical examination. The most striking symptom is that the individual appears to be much older than he/she really is. There are no specific laboratory tests for Werner syndrome. However, since diabetes may occur, the blood sugar level should be checked, and since artery disease may develop, cholesterol levels should be monitored, and treated if necessary. There is no cure or specific treatment for Werner syndrome.

Future research
Scientists have developed a strain of mice which have all the symptoms of Werner syndrome. They plan to use the mice in research to look at the relationship between aging and cancer, as well as gaining insight into the mechanisms at work in Werner syndrome.


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Danon Disease

Danon disease, a genetic disorder characterized by heart problems, mental retardation and muscle weakness. Changes in the retina of the eye, leading to visual disturbances, may be present. Males are more severely affected and show symptoms in childhood or early adolescence, while affected females usually develop the symptoms later, in adolescence or adulthood.

The disease is due to a mutation in the gene for LAMP-2 (which stands for lysosome-associated membrane protein 2.), a glycoprotein molecule (a molecule made up of carbohydrate + protein) that is normally located on the membrane surrounding the lysosome (a packet of powerful corrosive enzymes that degrade "garbage" within cells).

Danon disease is named for Dr. M.J. Danon who (together with colleagues) originally described it 1981 as "lysosomal glycogen storage disease with normal acid maltase."

Danon disease usually manifests with the clinical triad of cardiomyopathy, skeletal myopathy, and mental retardation. The skeletal myopathy and mental retardation are less common in females than in males. Regardless of sex, cardiomyopathy can present as a result of symptoms or congestive heart failure (CHF) or an arrhythmia-related event, such as syncope or sudden death. Patients are also newly identified when asymptomatic relatives of patients with established Danon disease are evaluated and are found to have the disease.

Sign and Symptoms:

* Moderate loss of central visual acuity
* Depigmentation of the peripheral retina[8]
* Decreased visual acuity with diffuse choriocapillary atrophy[11]
* Peripheral pigmentary retinopathy
* Lamellar opacities in the lens
* Nonspecific changes on electroretinography

Treatment:

Patients with Danon disease require frequent follow-up, with particular attention to the potential for atrial or ventricular arrhythmias and congestive heart failure (CHF). As is recommended in patients with hypertrophic cardiomyopathy (HCM), a ventricular septal thickness more than 30 mm is considered a risk factor for a life-threatening event, particularly in this group of patients who often have a poor prognosis for survival beyond their teenage years.




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Willebrand Disease

Von Willebrand disease, or vWD, is an inherited disorder that affects the blood's ability to clot properly. As a group, bleeding disorders (including hemophilia) are rare. Von Willebrand disease affects as much as 1% of the population or more.
A substance in the blood known as von Willebrand factor helps platelets stick to damaged blood vessels. Another function of von Willebrand factor is to carry the important clotting protein, called factor VIII, in the blood. People with vWD have a problem with one or both of these blood components.

In many people with von Willebrand disease (vWD), the signs are mild or they may be absent altogether. When signs occur, their intensity can vary from one person to another. Von Willebrand disease is often challenging to diagnose in milder cases.

Symptoms

Abnormal bleeding is the most common sign of von Willebrand disease, although it may be present at only moderate levels.

The abnormal bleeding associated with von Willebrand disease may occur as:

* Recurrent and prolonged nosebleeds
* Bleeding from the gums
* Increased menstrual flow
* Excessive bleeding from a cut or following a tooth extraction or other dental procedure
* Blood in the stool or urine
* Bleeding from shaving with a razor
* Easy bruising
* Bruises with lumps that form underneath the skin

Some people may realize that they have a bleeding disorder only after a surgical procedure or serious trauma in which excessive bleeding occurs.

Diagnosis

Ideally, a simple, single laboratory test could screen for the presence of VWD. Such a screening test would need to be sensitive to the presence of most types of VWD and would have a low false—positive rate. Unfortunately, no such test is available. In the past, the activated partial thromboplastin time (PTT) and bleeding time (BT) were recommended as diagnostic tests.

Treatment

Mild bleeds may be treated with pressure and are often self-limiting.

Hormones found in oral contraceptives administered intravenously, orally, topically, or by patch application.

Localized bleeding in the nose or mouth may be treated at the site with Thrombinar, Avitene, or Instat followed by a medication such as Amicar.



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Marfan Syndrome

Marfan syndrome is an inherited disorder of connective tissue, although about one-quarter of all cases occur without any family history of the syndrome. Marfan syndrome is caused by a defect in the fibrillin 1 gene on chromosome 15. It affects both men and women of all ethnic backgrounds. About 1 in 5,000 people have Marfan syndrome.

Symptoms

Marfan syndrome affects many areas of the body. Symptoms may include:

* tall and thin body type
* long arms, legs, fingers, and toes
* flexible joints
* curvature of the spine (scoliosis)
* chest sinks in (pectus excavatum) or sticks out (pectus carinatum)
* weak and fragile aorta, the main artery that carries blood away from the heart - it may become enlarged (aortic dilation) or develop a bulge (aneurysm), or may tear and burst (aortic dissection)
* severe nearsightedness, and sometimes dislocated lens of the eye

A person with Marfan syndrome has at least 3 symptoms in different parts of the body.

Diagnosis

If Marfan syndrome is suspected, a thorough physical examination should be done, as well as special testing. This would include:

* A complete family medical history and family tree
* Echocardiogram of the heart by a cardiologist
* Examination of the skeleton and measurement of body proportions
* Full eye examination by an eye doctor

Treatment

There is no cure for Marfan syndrome, but there are treatments that can help prevent or minimize its complications. The biggest threat to people with the syndrome is the sudden tearing of the aorta, a medical emergency which can be fatal. Therefore, close monitoring by a cardiologist and surgical repair of a weak aorta will save many lives. Blood pressure medications can also reduce stress on the aorta, as can avoiding strenuous exercise and contact sports.

In addition, regular physical examinations to monitor bones and joints and eye exams to watch for lens dislocation will help the person with Marfan syndrome. With good medical care most people can have a good quality of life and live a normal lifespan.



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Dandy-Walker Syndrome

Dandy-Walker Syndrome is a congenital condition affecting the cerebellum, an area in the lower back of the brain. Excess fluid in the areas surrounding the cerebellum impairs the brain's ability to control movement, and can also cause hydrocephalus and intracranial pressure. Other common features of the syndrome include an absence of the area between the hemispheres of the cerebellum, and a cyst at the base of the skull. It may be diagnosed at birth due to enlarged head size, or later in infancy or childhood when motor-skill problems appear. There is no cure, but treatment is available to lessen the impact of the symptoms.

Symptoms of Dandy-Walker Syndrome

Symptoms of Dandy-Walker syndrome vary according to age. Symptoms that appear in early infancy include: slow motor development and an abnormally enlarged skull. In older children symptoms include: irritability, vomiting, convulsions, ataxia and jerky eyes.

Other common symptoms of Dandy-Walker syndrome are:

* increased head circumference
* a head bulge at the back of the skull
* problems with the nerves that control the eyes, face and neck
* abnormal breathing patterns

Treatment

Treatments for Dandy-Walker syndrome are aimed at controlling and reducing the symptoms. In some cases, a special tube to reduce intracranial pressure may be placed inside the skull to control swelling.



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Chediak-Higashi Syndrome

Chediak-Higashi syndrome (CHS) is characterized by partial oculocutaneous albinism (OCA), immunodeficiency, and a mild bleeding tendency. Approximately 85% of affected individuals develop the accelerated phase, a lymphoproliferative infiltration of the bone marrow and reticuloendothelial system. Adolescents and adults with atypical CHS and children with classic CHS who have successfully undergone allogenic hematopoietic stem cell transplantation (HSCT) develop neurologic findings during early adulthood.

Symptoms

Children with this condition may have:

* silver hair
* light colored eyes (albinism)
* jerky eye movements
* dicreased vision
* intellectual disability
* muscle weakness
* nerve problem in the limbs
* nosebleeds or easy bruising
* numbness
* tremor
* seizures
* sensitivity to light (photophobia)


Diagnosis

The diagnosis of Chediak-Higashi syndrome (CHS) should be considered in individuals with pigment dilution defects of the hair, skin, or eyes; congenital or transient neutropenia; immunodeficiency; and otherwise unexplained neurologic abnormalities or neurodegeneration. Each of these findings may be variably represented in affected individuals; therefore, heightened suspicion is needed to pursue an accurate diagnosis.

Treatment

There is no specific treatment for Chediak-Higashi syndrome. Bone marrow transplants appear to have been successful in several patients, especially when performed early in the disease.

Antibiotics are used to treat infections. Antiviral drugs such as acyclovir and chemotherapy drugs are often used in the accelerated phase of the disease. Surgery may be needed to drain abscesses in some cases.




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