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Two families with TET3-related disorder showing neurodevelopmental delay with craniofacial dysmorphisms

Abstract

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.

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Fig. 1: Clinical features of three patients with TET3-related disorder.
Fig. 2: Pathogenic variants causing TET3-related disorder.
Fig. 3: Crystal structure of TET2 (PDB:5DEU) [19] bound to DNA.

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Acknowledgements

We thank all patients and their families for their participation in this study. We would like to thank N. Watanabe, T. Miyama, M. Sato, S. Sugimoto, and K. Takabe for their technical assistance. We thank Catherine Perfect, MA (Cantab), from Edanz (https://jp.edanz.com/ac), for editing a draft of this manuscript. R. Seyama, N. Tsuchida, Y. Uchiyama and N. Matsumoto contributed to the study design. R. Seyama, N. Tsuchida, K. Hamada, K. Ogata, Y. Uchiyama and N. Matsumoto performed the data analysis. Y. Okada, S. Sakata, S. Okada and N. Okamoto evaluated clinical information of patients. R. Seyama, Y. Uchiyama and N. Matsumoto prepared the manuscript. N. Matsumoto finalized the manuscript. All authors critically read the manuscript, corrected, and approved the final version of the manuscript.

Funding

This study was supported by the Japan Agency for Medical Research and Development (AMED) (grant numbers: JP21ek0109486, JP21ek0109549, JP21cm0106503, and JP21ek0109493); JSPS KAKENHI (grant numbers: JP20K07907, JP20K08164, JP21k15097, JP20K17428, JP21K07869, and JP20K16932); the Takeda Science Foundation; and the Ichiro Kanehara Foundation for the Promotion of Medical Science and Medical Care.

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Correspondence to Naomichi Matsumoto.

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Seyama, R., Tsuchida, N., Okada, Y. et al. Two families with TET3-related disorder showing neurodevelopmental delay with craniofacial dysmorphisms. J Hum Genet 67, 157–164 (2022). https://doi.org/10.1038/s10038-021-00986-y

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