The Ehlers-Danlos syndromes (EDS) are a group of heritable connective tissue disorders that share the common features of skin hyperextensibility, articular hypermobility, and tissue fragility. The major characteristics of kyphoscoliotic-type EDS are severe muscle hypotonia at birth, generalized joint laxity, scoliosis at birth, and scleral fragility and rupture of the ocular globe (Beighton et al., 1998).
Nevo syndrome, previously thought to be a distinct entity, is identical to EDS type VI (Voermans et al., 2009).
Genetic Heterogeneity of Ehlers-Danlos Syndrome, Kyphoscoliotic Type
See EDSSKCL2 (614557), caused by mutation in the FKBP14 gene (614505).
Classification of Ehlers-Danlos Syndromes
The current classification of Ehlers-Danlos syndromes is based on a 2017 international classification described by Malfait et al. (2017), which recognizes 13 EDS subtypes. This classification revised the 'Villefranche classification' reported by Beighton et al. (1998).
Beighton et al. (1998) reported on a revised nosology of the Ehlers-Danlos syndromes, designated the Villefranche classification. Major and minor diagnostic criteria were defined for each type and complemented whenever possible with laboratory findings. Six main descriptive types were substituted for earlier types numbered with Roman numerals: classic type (EDS I and II), hypermobility type (EDS III), vascular type (EDS IV), kyphoscoliosis type (EDS VI), arthrochalasia type (EDS VIIA and VIIB), and dermatosparaxis type (EDS VIIC). Six other forms were listed, including a category of 'unspecified forms.' [from
OMIM]