Human CDON peptide

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Holoprosencephaly (HPE) is the most common developmental forebrain anomaly in humans. Both environmental and genetic factors have been identified to play a role in the HPE phenotype. Previous studies of the genetic bases of HPE have taken a phenotype-first approach by examining groups of patients with HPE for specific mutations or deletions in known or candidate HPE genes. In this study, we characterized the presence or absence of HPE or a microform in 136 individuals in which microarray-based comparative genomic hybridization (aCGH) identified a deletion of one of 35 HPE loci. Frank holoprosencephaly was present in 11 individuals with deletions of one of the common HPE genes SHH, ZIC2, SIX3, and TGIF1, in one individual with a deletion of the HPE8 locus at 14q13, and in one individual with a deletion of FGF8, whereas deletions of other HPE loci and candidate genes (FOXA2 and LRP2) expressed microforms of HPE. Although individuals with deletions of other HPE candidates (DISP1, LSS, HHIP, SMO, BMP4, CDON, CDC42, ACVR2A, OTX2, and WIF1) had clinically significant features, none had frank HPE or a microform. A search for significant aCGH findings in individuals referred for testing for HPE revealed a novel association of a duplication involving GSK3B at 3q13.33 with HPE or a microform, seen in two unrelated individuals.