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Multiple sclerosis


Types and clinical signs ( Multiple sclerosis symptoms )

In this disease there is localized damage in the white matter of the brain that manifests in neurological deficits corresponding to the region of the brain where the damage has occurred. The disease occurs paroxysmally (in attacks) and two episodes each lasting more than 24 hours with an interval of more than a month between them are needed to establish the diagnosis.

The neurological deficits are diverse.

Inheritance pattern

Multifactorial - there is a genetic basis, and an environmental trigger, such as a particular virus, may lead to the onset of the disease in genetically predisposed individuals.

Penetrance

Not known. Women are affected twice as often as men. The age of onset in most affected individuals is between the ages of 20 and 40 years.

Associated features that can be demonstrated in tests performed during pregnancy

None.

What is the risk of recurrence in a subsequent pregnancy?

The brother of a female with multiple sclerosis has a 2.5% chance of having the same condition. Conversely the sister of an affected male has a 5% risk.

The brother of a male with multiple sclerosis has a 4% chance of having the same condition. Conversely the sister of an affected male has a 3% risk.

The identical twin of an affected individual has a 25% chance of also being affected. Conversely, a non-identical twin has the same risk as any other sibling - 2%.

The risk for children of a patient suffering from the disease is 2.5% irrespective of sex.

The risk for more distant relatives depends on the number of affected individuals in the family, the degree of relationship between the relatives and the affected individuals, etc., and is established within genetic counseling.

Molecular genetic information

Multiple Sclerosis

The gene for the disease and its location

One of the genes is situated, as in type 1 diabetes, in the region of the tissue matching (HLA) gene complex on chromosome 6.

Research is continuing in an attempt to find additional genes - mainly genes in the immune system - one of which is the gene PTPPRC on chromosome 1q31, in which mutations have been found in families of patients. These findings have not yet been proved and are not part of the standard clinical investigation, but serve as a marker.

Genetic testing

Diagnostic testing

In multiple sclerosis there are currently no reliable molecular tests. In specific families with many patients, it is possible to consider linkage analysis (see: Indirect testing for genetic markers in a family that has one or several patients - when there are a number of different genes that can each cause the disease - the gene, or most of the genes not having been located / identified / mapped - multifactorial diseases.

Carrier testing

There is no reliable carrier test for multiple sclerosis.

Fetal testing

There are no diagnostic molecular tests that can be performed in the fetus or newborn.

What is Multiple Sclerosis


 
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Comments (2)


Friday, July 15, 2011 11:38 AM
(1) janicecolline56r  says:


Multiple Sclerosis

Interesting to read all the new responses, thanks for all the current news and updates. Hope to read more very soon.


Tuesday, January 17, 2012 12:29 PM
(2) veronika  says:


thanks for the medical information

Thanks for the medical information it will come in very handy for my school project!





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