Preferred Label : Acrofacial dysostosis 1, nager type;
Symbol : AFD1;
CISMeF acronym : AFD1;
Type : Phenotype, molecular basis known;
Alternative titles and symbols : Afd, nager type; Nager acrofacial dysostosis; Nager syndrome; Mandibulofacial dysostosis, treacher collins type, with limb anomalies;
Description : Nager syndrome is the prototype for a group of disorders collectively referred to
as the acrofacial dysostoses (AFDs), which are characterized by malformation of the
craniofacial skeleton and the limbs. The major facial features of Nager syndrome include
downslanted palpebral fissures, midface retrusion, and micrognathia, the latter of
which often requires the placement of a tracheostomy in early childhood. Limb defects
typically involve the anterior (radial) elements of the upper limbs and manifest as
small or absent thumbs, triphalangeal thumbs, radial hyoplasia or aplasia, and radioulnar
synostosis. Phocomelia of the upper limbs and, occasionally, lower-limb defects have
also been reported. The presence of anterior upper-limb defects and the typical lack
of lower-limb involvement distinguishes Nager syndrome from Miller syndrome (263750),
another rare AFD; however, distingushing Nager syndrome from other AFDs, including
Miller syndrome, can be challenging (summary by Bernier et al., 2012).;
Inheritance : Autosomal dominant;
Molecular basis : Caused by mutation in the splicing factor 3B, subunit 4 gene (SF3B4, 605593.0001);
Prefixed ID : #154400;
Origin ID : 154400;
UMLS CUI : C0265245;
Currated CISMeF NLP mapping
DO Cross reference
Genes related to phenotype
HPO term(s)
Not associated HPO term(s)
ORDO concept(s)
Semantic type(s)
UMLS correspondences (same concept)