Werner syndrome

Infobox_Disease
Name = PAGENAME


Caption =
DiseasesDB = 14096
ICD10 =
ICD9 = ICD9|259.8
ICDO =
OMIM = 277700
MedlinePlus =
eMedicineSubj =
eMedicineTopic =
MeshName = Werner+Syndrome
MeshNumber = C16.320.925

Werner Syndrome (WRN) is a very rare, autosomal recessivecite journal |pmid=15946710 |year=2005 |month=Sep |author=Ozgenc A, Loeb LA |title=Current advances in unraveling the function of the Werner syndrome protein |volume=577 |issue=1-2 |pages=237–51 |doi=10.1016/j.mrfmmm.2005.03.020 |journal=Mutation research] disorder characterized by the appearance of premature aging. [cite journal |pmid=9288107 |year=1997 |month=Sep |author=Gray MD, Shen JC, Kamath-Loeb AS, Blank A, Sopher BL, Martin GM, Oshima J, Loeb LA |title=The Werner syndrome protein is a DNA helicase |volume=17 |issue=1 |pages=100�"3 |doi=10.1038/ng0997-100 |journal=Nature genetics]

Werner's syndrome more closely resembles accelerated aging than any other segmental progeria. For this reason, Werner syndrome is often referred to as a progeroid syndrome, as it partly mimics the symptoms of Progeria.

Pathophysiology

The defect is on a gene that codes DNA helicase and it is located on the short arm of the 8th chromosome. The disorder is directly caused by shorter-than-normal length telomere maintenance. As a result DNA replication is impaired, leading to existing DNA aging at an increased rate.

ymptoms

Individuals with this syndrome typically develop normally until they reach puberty. Following puberty they age rapidly, so that by age 40 they often appear several decades older. The age of onset of Werner syndrome is variable, but an early sign is the lack of a teenage growth spurt, which results in short stature. Other signs and symptoms appear when affected individuals are in their twenties or thirties and include loss and graying of hair, hoarseness of the voice, thickening of the skin, and cloudy lenses (cataracts) in both eyes. Overall, people affected by Werner syndrome have thin arms and legs and a thick torso.

Affected individuals typically have a characteristic facial appearance described as "bird-like" by the time they reach their thirties. Patients with Werner syndrome also exhibit genomic instability, hypogonadism, and various age-associated disorders; these include cancer, heart disease, atherosclerosis, diabetes mellitus, and cataracts. However, not all characteristics of old-age are present in Werner patients; for instance, senility is not seen in individuals with Werner syndrome. People affected by Werner syndrome usually do not live past their late forties or early fifties, often dying from the results of cancer or heart disease.

Genetics

Werner syndrome is an autosomal recessive disorder. The gene associated with Werner Syndrome lies on chromosome 8 in humans. [cite journal |pmid=1741060 |year=1992 |month=Feb |author=Goto M, Rubenstein M, Weber J, Woods K, Drayna D |title=Genetic linkage of Werner's syndrome to five markers on chromosome 8 |volume=355 |issue=6362 |pages=735–8 |doi=10.1038/355735a0 |journal=Nature]

History

Werner's syndrome is named after Otto Werner, [WhoNamedIt|synd|892] a German scientist, who, as a student, described the syndrome as part of his doctoral thesis in 1904.

ee also

* Accelerated aging disease
* Biogerontology
* Cockayne syndrome
* DNA repair
* Degenerative disease
* Genetic disorder
* Life extension
* Progeria
* Senescence
* Xeroderma pigmentosum

External links

"This article incorporates public domain text from [http://ghr.nlm.nih.gov The U.S. National Library of Medicine] "

* [http://digilander.libero.it/camdic/Werner%20Syndrome.htm Werner syndrome at libero.it]
* [http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/D/DNArepair.html DNA Repair at rcn.com]
* [http://www.benbest.com/lifeext/aging.html#progeria Segmental Progeria at benbest.com]
* [http://genomics.senescence.info/genes/entry.php?hugo=WRN WRN] at the GenAge database.
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References