Description : Hydrolethalus syndrome is an autosomal recessive embryonic lethal disorder characterized
by hydrocephaly or anencephaly, postaxial polydactyly of the upper limbs, and pre-
or postaxial polydactyly of the lower limbs. Duplication of the hallux is a common
finding. HLS2 is considered a ciliopathy (summary by Putoux et al., 2011). Acrocallosal
syndrome (ACLS; 200990) is an allelic disorder with a less severe phenotype.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the kinesin family member 7 gene (KIF7, 611254.0001);