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Cockayne syndrome

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**Cockayne syndrome**
*Classification & external resources*
ICD-10	Q 87.1
ICD-9	759.8
DiseasesDB	2907
eMedicine	ped/424
MeSH	D003057

Cockayne syndrome (or "Weber-Cockayne syndrome", or "Neill-Dingwall Syndrome") is a rare, autosomal recessive disorder characterized by growth failure, impaired development of the nervous system, abnormal sensitivity to sunlight (photosensitivity), and premature aging. Hearing loss and eye abnormalities (pigmentary retinopathy) are other common features, but problems with any or all of the internal organs are possible. It is named after English physician Edward Alfred Cockayne (1880-1956).

1 Forms of Cockayne syndrome
2 Causes
3 Physical appearance
4 See also
5 External links

Forms of Cockayne syndrome

CS Type I, or the “classic form”, is characterized by normal fetal growth with the onset of abnormalities in the first two years of life. Impairment of vision, hearing, and the central and peripheral nervous system progressively degenerate until death in the first or second decade of life.
CS Type II, otherwise known as connatal CS, involves very little neurological development after birth. Death usually occurs by age 7.
CS Type III is rare and is characterized by late onset. It is milder than Type I and Type II.
Xeroderma-pigmentosum-Cockayne syndrome (XP-CS) occurs when an individual also suffers from Xeroderma pigmentosum, another DNA repair disease. Some symptoms of each disease are expressed.

The condition is also classified genetically as follows:

Online 'Mendelian Inheritance in Man' (OMIM) 216400 (TYPE A)
Online 'Mendelian Inheritance in Man' (OMIM) 133540 (TYPE B)
Online 'Mendelian Inheritance in Man' (OMIM) 216411 (TYPE C)

Causes

Mutations in the ERCC6 and ERCC8 genes cause Cockayne syndrome. The proteins made by the ERCC8 and ERCC6 genes are involved in repairing damaged DNA by the transcription-coupled repair mechanism, particularly the DNA in active genes. If either the ERCC6 or the ERCC8 gene is altered, DNA damage is not repaired. As this damage accumulates, it can lead to malfunctioning cells or cell death, and the signs and symptoms of Cockayne syndrome.

Physical appearance

Small head size, short stature, sunken eyes, "aged" look.

External links

Share and Care Cockayne Syndrome Network

cockayne at NIH/UW GeneTests
This article incorporates public domain text from The U.S. National Library of Medicine

• • e Phakomatoses and other congenital malformations not elsewhere classified (Q85-Q89, 759)
Phakomatoses	Neurofibromatosis (type I, type II) - Tuberous sclerosis - Peutz-Jeghers syndrome - Sturge-Weber syndrome - Von Hippel-Lindau disease - Incontinentia pigmenti - Ataxia telangiectasia
Due to known exogenous causes	Fetal alcohol syndrome - Phocomelia (via Thalidomide)
Affecting multiple systems	facial (Mobius syndrome, Goldenhar syndrome, Cyclopia, Apert syndrome) short stature (Aarskog-Scott syndrome, Cockayne syndrome, Cornelia de Lange Syndrome, Dubowitz syndrome, Noonan syndrome, Robinow syndrome, Silver-Russell dwarfism, Seckel syndrome, Smith-Lemli-Opitz syndrome) limbs (Holt-Oram syndrome, Klippel-Trenaunay-Weber syndrome, Nail-patella syndrome, Rubinstein-Taybi syndrome, Sirenomelia, VACTERL association) overgrowth (Beckwith-Wiedemann syndrome, Sotos syndrome, Weaver syndrome) Marfan syndrome - Alport syndrome - Bardet-Biedl syndrome - Zellweger syndrome
Other	spleen: Asplenia - Splenomegaly endocrine glands: Persistent thyroglossal duct - Thyroglossal cyst Situs inversus - Conjoined twins Cowden syndrome - Hamartoma