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Int J Biol Sci 2018; 14(4):381-389. doi:10.7150/ijbs.23517

Research Paper

Expanding the Oro-Dental and Mutational Spectra of Kabuki Syndrome and Expression of KMT2D and KDM6A in Human Tooth Germs

Thantrira Porntaveetus1✉, Mushriq F Abid2, Thanakorn Theerapanon3, Chalurmpon Srichomthong4,5, Atsushi Ohazama6, Katsushige Kawasaki6, Maiko Kawasaki6, Kanya Suphapeetiporn4,5, Paul T. Sharpe2, Vorasuk Shotelersuk4,5

1. Craniofacial Genetics and Stem Cells Research Group, Department of Physiology, Faculty of Dentistry, Chulalongkorn University, Bangkok 10330, Thailand
2. Centre for Craniofacial and Regenerative Biology, Dental Institute, King's College London, London, SE1 9RT, UK
3. Excellence Center in Regenerative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, 10330, Thailand
4. Center of Excellence for Medical Genetics, Department of Pediatrics, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand
5. Excellence Center for Medical Genetics, King Chulalongkorn Memorial Hospital, the Thai Red Cross Society, Bangkok 10330, Thailand
6. Division of Oral Anatomy, Niigata University, Niigata 951-8514, Japan

Abstract

Kabuki syndrome is a rare genetic disorder characterized by distinct dysmorphic facial features, intellectual disability, and multiple developmental abnormalities. Despite more than 350 documented cases, the oro-dental spectrum associated with kabuki syndrome and expression of KMT2D (histone-lysine N-methyltransferase 2D) or KDM6A (lysine-specific demethylase 6A) genes in tooth development have not been well defined. Here, we report seven unrelated Thai patients with Kabuki syndrome having congenital absence of teeth, malocclusion, high-arched palate, micrognathia, and deviated tooth shape and size. Exome sequencing successfully identified that six patients were heterozygous for mutations in KMT2D, and one in KDM6A. Six were novel mutations, of which five were in KMT2D and one in KDM6A. They were truncating mutations including four frameshift deletions and two nonsense mutations. The predicted non-functional KMT2D and KDM6A proteins are expected to cause disease by haploinsufficiency. Our study expands oro-dental, medical, and mutational spectra associated with Kabuki syndrome. We also demonstrate for the first time that KMT2D and KDM6A are expressed in the dental epithelium of human tooth germs.

Keywords: Craniofacial anomalies, genetics, tooth development, hypodontia

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) license (https://creativecommons.org/licenses/by-nc/4.0/). See http://ivyspring.com/terms for full terms and conditions.
How to cite this article:
Porntaveetus T, Abid MF, Theerapanon T, Srichomthong C, Ohazama A, Kawasaki K, Kawasaki M, Suphapeetiporn K, Sharpe PT, Shotelersuk V. Expanding the Oro-Dental and Mutational Spectra of Kabuki Syndrome and Expression of KMT2D and KDM6A in Human Tooth Germs. Int J Biol Sci 2018; 14(4):381-389. doi:10.7150/ijbs.23517. Available from http://www.ijbs.com/v14p0381.htm