Wellcome Open Research (Apr 2018)

The Tatton-Brown-Rahman Syndrome: A clinical study of 55 individuals with de novo constitutive DNMT3A variants [version 1; referees: 2 approved]

  • Katrina Tatton-Brown,
  • Anna Zachariou,
  • Chey Loveday,
  • Anthony Renwick,
  • Shazia Mahamdallie,
  • Lise Aksglaede,
  • Diana Baralle,
  • Daniela Barge-Schaapveld,
  • Moira Blyth,
  • Mieke Bouma,
  • Jeroen Breckpot,
  • Beau Crabb,
  • Tabib Dabir,
  • Valerie Cormier-Daire,
  • Christine Fauth,
  • Richard Fisher,
  • Blanca Gener,
  • David Goudie,
  • Tessa Homfray,
  • Matthew Hunter,
  • Agnete Jorgensen,
  • Sarina G. Kant,
  • Cathy Kirally-Borri,
  • David Koolen,
  • Ajith Kumar,
  • Anatalia Labilloy,
  • Melissa Lees,
  • Carlo Marcelis,
  • Catherine Mercer,
  • Cyril Mignot,
  • Kathryn Miller,
  • Katherine Neas,
  • Ruth Newbury-Ecob,
  • Daniela T. Pilz,
  • Renata Posmyk,
  • Carlos Prada,
  • Keri Ramsey,
  • Linda M. Randolph,
  • Angelo Selicorni,
  • Deborah Shears,
  • Mohnish Suri,
  • I. Karen Temple,
  • Peter Turnpenny,
  • Lionel Val Maldergem,
  • Vinod Varghese,
  • Hermine E. Veenstra-Knol,
  • Naomi Yachelevich,
  • Laura Yates,
  • Clinical Assessment of the Utility of Sequencing and Evaluation as a Service (CAUSES) Research Study,
  • Deciphering Developmental Disorders (DDD) Study,
  • Nazneen Rahman

DOI
https://doi.org/10.12688/wellcomeopenres.14430.1
Journal volume & issue
Vol. 3

Abstract

Read online

Tatton-Brown-Rahman syndrome (TBRS; OMIM 615879), also known as the DNMT3A-overgrowth syndrome, is an overgrowth intellectual disability syndrome first described in 2014 with a report of 13 individuals with constitutive heterozygous DNMT3A variants. Here we have undertaken a detailed clinical study of 55 individuals with de novo DNMT3A variants, including the 13 previously reported individuals. An intellectual disability and overgrowth were reported in >80% of individuals with TBRS and were designated major clinical associations. Additional frequent clinical associations (reported in 20-80% individuals) included an evolving facial appearance with low-set, heavy, horizontal eyebrows and prominent upper central incisors; joint hypermobility (74%); obesity (weight ³2SD, 67%); hypotonia (54%); behavioural/psychiatric issues (most frequently autistic spectrum disorder, 51%); kyphoscoliosis (33%) and afebrile seizures (22%). One individual was diagnosed with acute myeloid leukaemia in teenage years. Based upon the results from this study, we present our current management for individuals with TBRS