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Guttmacher syndrome is an extremely rare syndrome characterized by hypoplastic thumbs and halluces, 5th finger clinobrachydactyly, postaxial polydactyly of the hands, short or uniphalangeal 2nd toes with absent nails and hypospadias.
ORPHA:2957Classification level: Disorder
It has been described in a father and his son and daughter.
The affected patients have normal mental development. Except for postaxial polydactyly of the hands and uniphalangeal 2nd toes with absent nails, features are in common with hand-foot-genital syndrome (HFGS, see this term) caused by mutations in the HOXA13 gene.
In all three affected individuals with Guttmacher syndrome, two different sequence alterations were identified in HOXA13 gene: a de novo missense mutation and a deletion in the promoter region of the gene, inherited from an unaffected parent, which may contribute to the phenotype in the affected individuals.
The condition is inherited in an autosomal dominant manner.