CTCF deletion syndrome: Clinical features and epigenetic delineation

Ikumi Hori, Rie Kawamura, Kazuhiko Nakabayashi, Hidetaka Watanabe, Ken Higashimoto, Junko Tomikawa, Daisuke Ieda, Kei Ohashi, Yutaka Negishi, Ayako Hattori, Yoshitsugu Sugio, Keiko Wakui, Kenichiro Hata, Hidenobu Soejima, Kenji Kurosawa, Shinji Saitoh

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Abstract

Background Heterozygous mutations in CTCF have been reported in patients with distinct clinical features including intellectual disability. However, the precise pathomechanism underlying the phenotype remains to be uncovered, partly because of the diverse function of CTCF. Here we describe extensive clinical and genetic investigation for two patients with a microdeletion encompassing CTCF. Methods We performed genetic examination including comprehensive investigation of X chromosome inactivation and DNA methylation profiling at imprinted loci and genome-wide. Results Two patients showed comparable clinical features to those in a previous report, indicating that haploinsufficiency of CTCF was the major determinant of the microdeletion syndrome. Despite the haploinsufficiency of CTCF, X chromosome inactivation was normal. DNA methylation at imprinted loci was normal, but hypermethylation at CTCF binding sites was demonstrated, of which PRKCZ and FGFR2 were identified as candidate genes. Conclusions This study confirms that haploinsufficiency of CTCF causes distinct clinical features, and that a microdeletion encompassing CTCF could cause a recognisable CTCF deletion syndrome. Perturbed DNA methylation at CTCF binding sites, not at imprinted loci, may underlie the pathomechanism of the syndrome.

Original languageEnglish
Pages (from-to)836-842
Number of pages7
JournalJournal of Medical Genetics
Volume54
Issue number12
DOIs
Publication statusPublished - 01-12-2017

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

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    Hori, I., Kawamura, R., Nakabayashi, K., Watanabe, H., Higashimoto, K., Tomikawa, J., Ieda, D., Ohashi, K., Negishi, Y., Hattori, A., Sugio, Y., Wakui, K., Hata, K., Soejima, H., Kurosawa, K., & Saitoh, S. (2017). CTCF deletion syndrome: Clinical features and epigenetic delineation. Journal of Medical Genetics, 54(12), 836-842. https://doi.org/10.1136/jmedgenet-2017-104854