Exome Sequencing Identification of EP300 Mutation in a Proband with Coloboma and Imperforate Anus: Possible Expansion of the Phenotypic Spectrum of Rubinstein-Taybi Syndrome.
Rubinstein-Taybi syndrome (RSTS) is a multisystem developmental disorder characterized by facial dysmorphisms, broad thumbs and halluces, growth retardation, and intellectual disability. In about 8% of RSTS cases, mutations are found in EP300. Previously, the EP300 mutation has been shown to cause the highly variable RSTS phenotype. Using exome sequencing, we identified a de novo EP300 frameshift mutation in a proband with coloboma, facial asymmetry and imperforate anus with minimal RSTS features. Previous molecular studies have demonstrated the importance of EP300 in oculogenesis, supporting the possibility that EP300 mutation may cause ocular coloboma. Since a wide phenotypic spectrum is well known in EP300-associated RSTS cases, the atypical phenotype identified in our proband may be an example of rare manifestations of RSTS.
Institute for Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, The University of Tokyo, Tokyo, Japan.
Koji
K
Masuda
Institute for Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, The University of Tokyo, Tokyo, Japan.
Kazuhiro
K
Akiyama
Division of Medical Genetics, Nagano Children's Hospital, Azumino, Japan.
Michiko
M
Arakawa
Department of Medical Genetics, Shinshu University Graduate School of Medicine, Matsumoto, Japan ; Division of Medical Genetics, Nagano Children's Hospital, Azumino, Japan.
Eriko
E
Nishi
Department of Ophthalmology, Nagano Children's Hospital, Azumino, Japan.
Noritaka
N
Kitazawa
General Pediatrics, Nagano Children's Hospital, Azumino, Japan.
Tsukasa
T
Higuchi
Institute for Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, The University of Tokyo, Tokyo, Japan.
Yuki
Y
Katou
Institute for Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, The University of Tokyo, Tokyo, Japan ; CREST, Japan Science and Technology Agency, Kawaguchi, Japan.
Katsuhiko
K
Shirahige
Institute for Molecular and Cellular Biosciences, Research Center for Epigenetic Disease, The University of Tokyo, Tokyo, Japan ; Division of Medical Genetics, Nagano Children's Hospital, Azumino, Japan.
Kosuke
K
Izumi
Coloboma; EP300 mutation; Imperforate anus; Rubinstein-Taybi syndrome