We studied a large consanguineous Anatolian family with children who exhibi
ted hydranencephaly associated with microcephaly. The children were severel
y affected. This novel genetic disorder is autosomal recessive. We used aut
ozygosity mapping to identify a locus at chromosome 16p13.3-12.1; it has a
LOD score of 4.11. The gene locus is within a maximal 11-cM interval betwee
n markers D16S497 and D16S672 and within a minimal critical region of 8 cM
between markers D16S748 and D16S490.