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    TET3 at 2p13.1 encodes tet methylcytosine dioxygenase 3, a demethylation enzyme that converts 5-methylcytosine to 5-hydroxymethylcytosine. Beck et al. reported that patients with TET3 abnormalities in either an autosomal dominant or recessive inheritance fashion clinically showed global developmental delay, intellectual disability, and dysmorphisms. In this study, exome sequencing identified both mono- and biallelic TET3 variants in two families: a de novo variant NM_001287491.1:c.3028 A > G:p.(Asn1010Asp), and compound heterozygous variants NM_001287491.1:c.[2077 C > T];[2896 T > G],p.[Gln693*];[Cys966Gly]. Despite the different inheritance modes, the affected individuals showed similar phenotypic features. Including these three patients, only 14 affected individuals have been reported to date. The accumulation of data regarding individuals with TET3-related disorder is necessary to describe their clinical spectrum. © 2021. The Author(s), under exclusive licence to The Japan Society of Human Genetics.


    Rie Seyama, Naomi Tsuchida, Yasuyuki Okada, Sonoko Sakata, Keisuke Hamada, Yoshiteru Azuma, Kohei Hamanaka, Atsushi Fujita, Eriko Koshimizu, Satoko Miyatake, Takeshi Mizuguchi, Shintaro Makino, Atsuo Itakura, Satoshi Okada, Nobuhiko Okamoto, Kazuhiro Ogata, Yuri Uchiyama, Naomichi Matsumoto. Two families with TET3-related disorder showing neurodevelopmental delay with craniofacial dysmorphisms. Journal of human genetics. 2022 Mar;67(3):157-164

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    PMID: 34719681

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