Preferred Label : Cockayne syndrome a;
Symbol : CSA;
CISMeF acronym : CSA;
Type : Phenotype, molecular basis known;
Description : Cockayne syndrome is characterized by abnormal and slow growth and development that
becomes evident within the first few years after birth. 'Cachectic dwarfism' describes
the outward appearance of afflicted individuals. Other features include cutaneous
photosensitivity, thin, dry hair, a progeroid appearance, progressive pigmentary retinopathy,
sensorineural hearing loss, dental caries, and a characteristic stance in the ambulatory
patient. Patients often show disproportionately long limbs with large hands and feet,
and flexion contractures of joints are usual skeletal features. Knee contractures
result in a 'horse-riding stance.' There is delayed neural development and severe
progressive neurologic degeneration resulting in mental retardation. The mean age
at death in reported cases is 12.5 years, although a few affected individuals have
lived into their late teens or twenties. Remarkably, in striking contrast with xeroderma
pigmentosum, patients with CS have no significant increase in skin cancer or infection
(Nance and Berry, 1992). Lowry (1982) noted that there is an early-onset form of Cockayne
syndrome in which patients may show abnormalities at birth and have a shorter survival.
Lowry (1982) thus suggested that CS could be divided clinically into the more common
type I, with classic CS symptoms that manifest within the first few years or life,
and the less common type II, with more severe symptoms that manifest prenatally. Mallery
et al. (1998) found no correlation between genotype and phenotype among 16 patients
with CS of varying severities, and concluded that clinical differences were based
on other genetic backgrounds or the intrauterine environment. - Genetic Heterogeneity
of Cockayne Syndrome Cockayne syndrome is a genetically heterogeneous disorder, and
certain types show some overlap with certain forms of xeroderma pigmentosum (XP),
another disorder caused by defective DNA repair. See also Cockayne syndrome B (133540),
caused by mutation in the ERCC6 gene (609413) on chromosome 10q11; XPG/CS (see 278780),
caused by mutation in the ERCC5 gene (133530) on chromosome 13q33; XPB/CS (see 610651),
caused by mutation in the ERCC3 gene (133510) on chromosome 2q21; and XPF/CS (see
278760), caused by mutation in the ERCC4 gene (133520) on chromosome 16p13. Rapin
et al. (2000) reviewed the clinical, pathologic, and molecular features of Cockayne
syndrome, xeroderma pigmentosum, and the XP-CS complex.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutations in the excision-repair cross-complementing group 8 gene (ERCC8,
609412.0001);
Laboratory abnormalities : Thymic hormone decreased; At least 2 complementation groups; Abnormal myelination in sural nerve biopsies; Disturbed visual and brainstem auditory evoked responses indicative of CNS demyelination; Increased cellular sensitivity to UV light;
Prefixed ID : #216400;
Origin ID : 216400;
UMLS CUI : C0751039;
Automatic exact mappings (from CISMeF team)
Broader ORDO disease(s)
Currated CISMeF NLP mapping
DO Cross reference
Genes related to phenotype
HPO term(s)
ORDO concept(s)
See also inter- (CISMeF)
Semantic type(s)
UMLS correspondences (same concept)
Validated automatic mappings to NTBT