Tibial hemimelia-polydactyly-triphalangeal thumb syndrome is a distinct congenital limb anomaly complex, whose association with the 404 G>A mutation in a distant sonic hedgehog cis-regulator (ZRS) was suggested. The authors report a sporadic case of bilateral tibial hemimelia-preaxial polydactyly-five-fingered hands harboring the same mutation. This case further supports a causal relationship between this mutation and the phenotype.
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