Polysyndactyly, also known as preaxial polydactyly type IV, is a rare autosomal dominant limb malformation, caused by mutations in the GLI3 gene. It is comprising duplicated halluces, with syndactyly of preaxial toes, broad or duplicated thumbs, and syndactyly of the third and fourth fingers. GLI3 is regarded as a mediator of sonic hedgehog signaling regulating development at multiple sites such as the limbs, the lungs, and the brain.
Category
Congenital malformation
Brite
Human diseases in ICD-11 classification [BR:br08403]
20 Developmental anomalies
Structural developmental anomalies primarily affecting one body system
Structural developmental anomalies of the skeleton
LB78 Polydactyly
H01226 Polysyndactyly
Radhakrishna U, Bornholdt D, Scott HS, Patel UC, Rossier C, Engel H, Bottani A, Chandal D, Blouin JL, Solanki JV, Grzeschik KH, Antonarakis SE
Title
The phenotypic spectrum of GLI3 morphopathies includes autosomal dominant preaxial polydactyly type-IV and postaxial polydactyly type-A/B; No phenotype prediction from the position of GLI3 mutations.
