SADDAN
Last updated 18 Aug 2020
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SADDAN (severe achondroplasia with developmental delay and acanthosis nigricans) is a rare disorder of bone growth characterised by skeletal, brain, and skin abnormalities.
Description
SADDAN (severe achondroplasia with developmental delay and acanthosis nigricans) is a rare disorder of bone growth characterised by skeletal, brain, and skin abnormalities.
All people with this condition have extremely short stature with particularly short arms and legs. Other features include unusual bowing of the leg bones; a small chest with short ribs and curved collar bones; short, broad fingers; and folds of extra skin on the arms and legs. Structural abnormalities of the brain cause seizures, profound developmental delay, and intellectual disability. Several affected individuals also have had episodes in which their breathing slows or stops for short periods (apnea). Acanthosis nigricans, a progressive skin disorder characterised by thick, dark, velvety skin, is another characteristic feature of SADDAN that develops in infancy or early childhood.
Inheritance patterns
The source lists the following possible inheritance patterns: Autosomal dominant. More than one pattern can apply in different cases.
Related genes
Other names
Achondroplasia, severe, with developmental delay and acanthosis nigricans
SADDAN dysplasia
Severe achondroplasia with developmental delay and acanthosis nigricans
Skeleton-skin-brain syndrome
SSB syndrome
Further reading and references
- SADDAN; MedlinePlus, National Library of Medicine.
- Bellus GA, Bamshad MJ, Przylepa KA, Dorst J, Lee RR, Hurko O, Jabs EW, Curry CJ, Wilcox WR, Lachman RS, Rimoin DL, Francomano CA. Severe achondroplasia with developmental delay and acanthosis nigricans (SADDAN): phenotypic analysis of a new skeletal dysplasia caused by a Lys650Met mutation in fibroblast growth factor receptor 3. Am J Med Genet. 1999 Jul 2;85(1):53-65.
- Cohen MM Jr. Some chondrodysplasias with short limbs: molecular perspectives. Am J Med Genet. 2002 Oct 15;112(3):304-13. doi: 10.1002/ajmg.10780.
- Kumar KV, Shaikh A, Sharma R, Prusty P. SADDAN syndrome. J Pediatr Endocrinol Metab. 2011;24(9-10):851-2. doi: 10.1515/jpem.2011.290.
- Vajo Z, Francomano CA, Wilkin DJ. The molecular and genetic basis of fibroblast growth factor receptor 3 disorders: the achondroplasia family of skeletal dysplasias, Muenke craniosynostosis, and Crouzon syndrome with acanthosis nigricans. Endocr Rev. 2000 Feb;21(1):23-39. doi: 10.1210/edrv.21.1.0387.
- Zankl A, Elakis G, Susman RD, Inglis G, Gardener G, Buckley MF, Roscioli T. Prenatal and postnatal presentation of severe achondroplasia with developmental delay and acanthosis nigricans (SADDAN) due to the FGFR3 Lys650Met mutation. Am J Med Genet A. 2008 Jan 15;146A(2):212-8. doi: 10.1002/ajmg.a.32085.
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