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Laboratory investigations usually show elevated creatine kinase, myopathic/dystrophic muscle pathology and altered α-dystroglycan. Antenatal diagnosis is possible in families with known mutations. Prenatal ultrasound may be helpful for diagnosis in families where the molecular defect is unknown.
Prevention for Alström Syndrome is considered to be harder compared to other diseases/syndromes because it is an inherited condition. However, there are other options that are available for parents with a family history of Alström Syndrome. Genetic testing and counseling are available where individuals are able to meet with a genetic counselor to discuss risks of having the children with the disease. The genetic counselor may also help determine whether individuals carry the defective ALSM1 gene before the individuals conceive a child. Some of the tests the genetic counselors perform include chorionic villus sampling (CVS), Preimplantation genetic diagnosis (PGD), and amniocentesis. With PGD, the embryos are tested for the ALSM1 gene and only the embryos that are not affected may be chosen for implantation via in vitro fertilization.
It is possible to clinically detect Alström syndrome in infancy, but more frequently, it is detected much later, as doctors tend to detect symptoms as separate problems. Currently, Alström syndrome is often diagnosed clinically, since genetic testing is costly and only available on a limited basis.
A physical examination would be needed to properly diagnose the patient. Certain physical characteristics can determine if the patient has some type of genetic disorder. Usually, a geneticist would perform the physical examination by measuring the distance around the head, distance between the eyes, and the length of arms and legs. In addition, examinations for the nervous system or the eyes may be performed. Various imaging studies like computerized tomography scans (CT), Magnetic Resonance Imaging (MRI), or X-rays are used to see the structures within the body.
Family and personal medical history are required. Information about the health of an individual is crucial because it provides traces to a genetic diagnosis.
Laboratory tests, particularly genetic testing, are performed to diagnose genetic disorders. Some of the types of genetic testing are molecular, biochemical, and chromosomal. Other laboratory tests performed may measure levels of certain substances in urine and blood that can also help suggest a diagnosis.
No specific treatment is available. Management is only supportive and preventive.
Those who are diagnosed with the disease often die within the first few months of life. Almost all children with the disease die by the age of three.
Anomalies of the hair shaft caused by ectodermal dysplasia should be ruled out. Mutations in the CDH3 gene can also appear in EEM syndrome.
The extent of retinal damage is assessed by fluorescent angiography, retinal scanning and optical coherence tomography; electrophysiological examinations such as electroretinography (ERG) or multifocal electroretinography (mfERG) may also be used.
In terms of diagnosis of Fukuyama congenital muscular dystrophy, serum creatine kinase concentration and muscle biopsies can be obtained to help determine if the individual has FMCD. FKTN molecular genetic testing is used to determine a mutation in the FKTN gene after a serum creatine kinase concentration, muscle biopsies, and/or MRI imaging have presented abnormalities indicative of FCMD, the presence of the symptoms indicates Fukuyama congenital muscular dystrophy. The available genetic test include:
- Linkage analysis
- Deletion analysis
- Sequence analysis - exons
- Sequence analysis - entire coding region
EEM syndrome (or Ectodermal dysplasia, Ectrodactyly and Macular dystrophy syndrome) is an autosomal recessive congenital malformation disorder affecting tissues associated with the ectoderm (skin, hair, nails, teeth), and also the hands, feet and eyes.
EEM syndrome is caused by mutations in the "P-cadherin" gene ("CDH3"). Distinct mutations in "CDH3" (located on human chromosome 16) are responsible for the macular dystrophy and spectrum of malformations found in EEM syndrome, due in part to developmental errors caused by the resulting inability of "CDH3" to respond correctly to the "P-cadherin" transcription factor p63.
The gene for p63 ("TP73L", found on human chromosome 3) may also play a role in EEM syndrome. Mutations in this gene are associated with the symptoms of EEM and similar disorders, particularly ectrodactyly.
EEM syndrome is an autosomal recessive disorder, which means the defective gene is located on an autosome, and two copies of the defective gene - one from each parent - are required to inherit the disorder. The parents of an individual with an autosomal recessive disorder both carry one copy of the defective gene, but usually do not experience any signs or symptoms of the disorder.
The diagnosis of Emery–Dreifuss muscular dystrophy can be established via single-gene testing or genomic testing, and clinically diagnosed via the following exams/methods:
In terms of the diagnosis of Ullrich congenital muscular dystrophy upon inspection follicular hyperkeratosis, may be a dermatological indicator, additionally also serum creatine kinase may be mildly above normal. Other exams/methods to ascertain if the individual has Ullrich congenital muscular dystrophy are:
Asphyxiating thoracic dysplasia or Jeune syndrome is a ciliopathy.It is also known as "Jeune syndrome".
It was described in 1955.
According to Clinicaltrials.gov, there are no current studies on hyperglycerolemia.
Clinicaltrials.gov is a service of the U.S. National Institutes of Health. Recent research shows patients with high concentrations of blood triglycerides have an increased risk of coronary heart disease. Normally, a blood glycerol test is not ordered. The research was about a child having elevated levels of triglycerides when in fact the child had glycerol kinase deficiency. This condition is known as pseudo-hypertriglyceridemia, a falsely elevated condition of triglycerides. Another group treated patients with elevated concentrations of blood triglycerides with little or no effect on reducing the triglycerides. A few laboratories can test for high concentrations of glycerol, and some laboratories can compare a glycerol-blanked triglycerides assay with the routine non-blanked method. Both cases show how the human body may exhibit features suggestive of a medical disorder when in fact it is another medical condition causing the issue.
Fukuyama congenital muscular dystrophy has a poor prognosis. Most children with FCMD reach a maximum mobility at sitting upright and sliding. Due to the compounded effects of continually worsening heart problems, impaired mental development, problems swallowing and additional complications, children with FCMD rarely live through adolescence, the disorder proves fatal by age 20.
DC is associated with shorter life expectancy, but many live to at least age 60.
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. The genetic blood testing is more common.Additionally, a distinction between OPMD and myasthenia gravis or mitochondrial myopathy must be made, in regards to the differential diagnosis of this condition.
Genetic tests, including prenatal testing, are available for both confirmed forms. Molecular testing is considered the gold standard of diagnosis.
Testing at pregnancy to determine whether an unborn child is affected is possible if genetic testing in a family has identified a DMPK mutation. This can be done at 10–12 weeks gestation by a procedure called chorionic villus sampling (CVS) that involves removing a tiny piece of the placenta and analyzing DNA from its cells. It can also be done by amniocentesis after 14 weeks gestation by removing a small amount of the amniotic fluid surrounding the baby and analyzing the cells in the fluid. Each of these procedures has a small risk of miscarriage associated with it and those who are interested in learning more should check with their doctor or genetic counselor.
There is also another procedure called preimplantation diagnosis that allows a couple to have a child that is unaffected with the genetic condition in their family. This procedure is experimental and not widely available. Those interested in learning more about this procedure should check with their doctor or genetic counselor.
Dyskeratosis congenita (DKC), also called Zinsser-Cole-Engman syndrome, is a rare progressive congenital disorder with a highly variable phenotype. The entity was classically defined by the triad of abnormal skin pigmentation, nail , and leukoplakia of the oral mucosa, but these components do not always occur. DKC is characterized by short telomeres. Some of the manifestations resemble premature aging (similar to progeria). The disease initially mainly affects the skin, but a major consequence is progressive bone marrow failure which occurs in over 80%, causing early mortality.
Jeune syndrome is a rare genetic disorder that affects the way a child’s cartilage and bones develop. It begins before the child is born. Jeune syndrome affects the child's rib cage, pelvis, arms and legs.
Usually, problems with the rib cage cause the most serious health problems for children with Jeune syndrome. Their rib cages (thorax) are smaller and narrower than usual. This can keep the child's lungs from developing fully or expanding when the child inhales. The child may breathe rapidly and shallowly. They may have trouble breathing when they have an upper or lower respiratory infection, like pneumonia.
Breathing trouble can range from mild to severe. In some children, it is not noticeable, aside from fast breathing. In most children, breathing problems are serious. About 60% to 70% of children with this condition die from respiratory failure as babies or young children.
Children with Jeune syndrome who survive often develop problems with their kidneys, another serious feature of Jeune syndrome. Over time they may experience renal failure.
As a result, few children with Jeune syndrome live into their teen years.
Children with Jeune syndrome have a form of dwarfism. They are short in stature, and their arms and legs are shorter than most people’s.
Another name for Jeune syndrome is asphyxiating thoracic dystrophy. This diagnosis is grouped with other chest problems called thoracic insufficiency syndrome (TIS).
Currently, there is no cure for laminopathies and treatment is largely symptomatic and supportive. Physical therapy and/or corrective orthopedic surgery may be helpful for patients with muscular dystrophies. Cardiac problems that occur with some laminopathies may require a pacemaker. Treatment for neuropathies may include medication for seizures and spasticity.
The recent progress in uncovering the molecular mechanisms of toxic progerin formation in laminopathies leading to premature aging has opened up the potential for the development of targeted treatment. The farnesylation of prelamin A and its pathological form progerin is carried out by the enzyme farnesyl transferase. Farnesyl transferase inhibitors (FTIs) can be used effectively to reduce symptoms in two mouse model systems for progeria and to revert the abnormal nuclear morphology in progeroid cell cultures. Two oral FTIs, lonafarnib and tipifarnib, are already in use as anti-tumor medication in humans and may become avenues of treatment for children suffering from laminopathic progeria. Nitrogen-containing bisphosphate drugs used in the treatment of osteoporosis reduce farnesyldiphosphate production and thus prelamin A farnesylation. Testing of these drugs may prove them to be useful in treating progeria as well. The use of antisense oligonucleotides to inhibit progerin synthesis in affected cells is another avenue of current research into the development of anti-progerin drugs.
For the diagnosis of congenital muscular dystrophy, the following tests/exams are done:
- Lab study (CK levels)
- MRI (of muscle, and/or brain)
- EMG
- Genetic testing
The subtypes of congenital muscular dystrophy have been established through variations in multiple genes. It should be noted that phenotype, as well as, genotype classifications are used to establish the subtypes, in some literature.
One finds that congenital muscular dystrophies can be either autosomal dominant or autosomal recessive in terms of the inheritance pattern, though the latter is much more common
Individuals who suffer from congenital muscular dystrophy fall into one of the following "types":
It is possible to test someone who is at risk for developing DM1 before they are showing symptoms to see whether they inherited an expanded trinucleotide repeat. This is called predictive testing. Predictive testing cannot determine the age of onset that someone will begin to have symptoms, or the course of the disease. If the child is not having symptoms, the testing is not possible with an exception of emancipated minors as a policy.
Glycerol and glycerol kinase activity analyses are usually not offered by routine general medical laboratories. To diagnose hyperglycerolemia, blood and urine can be tested for the amounts of glycerol present.
There are three clinical forms of GKD: infantile, juvenile, and adult. The infantile form is associated with severe developmental delay and results in a syndrome with Xp21 gene deletion with congenital adrenal hypoplasia and/or Duchenne muscular dystrophy. The infantile diagnosis is made by measuring plasma glycerol and is characterized by glycerol levels between 1.8 and 8.0 mmol/L and glyceroluria more than 360 mmol/24h. To confirm the diagnosis, genetic testing of the Xp21 gene is definitive. Children with GKD have severe hypoglycemic episodes and profound metabolic acidosis, or are completely symptom free. Individuals who are unable to form glucose from the glycerol released during triglyceride catabolism also the hypoglycemic episodes often disappear during adolescence. Patients with the juvenile and adult forms often have no symptoms and are diagnosed fortuitously when a medical professional tests for another medical condition. The juvenile form is an uncommon form characterized by Reye syndrome-like clinical manifestations including episodic vomiting, acidemia, and disorders of consciousness.
Research on prenatal diagnosis has shown that a diagnosis can be made prenatally in approximately 50% of fetuses presenting arthrogryposis. It could be found during routine ultrasound scanning showing a lack of mobility and abnormal position of the foetus. Nowadays there are more options for visualization of details and structures can be seen well, like the use of 4D ultrasound. In clinic a child can be diagnosed with arthrogryposis with physical examination, confirmed by ultrasound, , or muscle biopsy.