Dwarfism-onychodysplasia, fifth digit syndrome, mental retardation with hypoplastic 5th fingernails and toenails, short stature-onychodysplasia
Coffin–Siris syndrome is inherited in an autosomal dominant manner
Coffin–Siris syndrome (CSS), first described in 1970 by Dr Grange S. Coffin and Dr E. Siris,[1][2] is a rare genetic disorder that causes developmental delays and absent fifth finger and toe nails.
There had been 31 reported cases by 1991.[3] The number of occurrences since then has grown and is now reported to be around 200.[4]
The diagnosis is generally based on the presence of major and at least one minor clinical sign and can be confirmed by molecular genetic testing of the causative genes. Recent studies revealed that fifth finger nail/distal phalanx hypoplasia or aplasia is not a mandatory finding.[9]
Typically, lab work will be done to rule out other conditions and genetic testing will also be performed to get the official diagnosis.[9]
Treatment
There is no known cure or standard for treatment. Treatment is based on symptoms and may include physical, occupational and speech therapy and educational services as well.[9]
^Sousa SB, Abdul-Rahman OA, Bottani A, Cormier-Daire V, Fryer A, Gillessen-Kaesbach G, Horn D, Josifova D, Kuechler A, Lees M, MacDermot K, Magee A, Morice-Picard F, Rosser E, Sarkar A, Shannon N, Stolte-Dijkstra I, Verloes A, Wakeling E, Wilson L, Hennekam RC (August 2009). "Nicolaides-Baraitser syndrome: Delineation of the phenotype". American Journal of Medical Genetics. Part A. 149A (8): 1628–40. doi:10.1002/ajmg.a.32956. PMID19606471.
^ abcdefVergano, Samantha Schrier; Santen, Gijs; Wieczorek, Dagmar; Wollnik, Bernd; Matsumoto, Naomichi; Deardorff, Matthew A. (12 August 2021). "Coffin-Siris Syndrome". University of Washington, Seattle. PMID23556151.