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Arch Dis Child. 2020 Apr;105(4):384-389. doi: 10.1136/archdischild-2018-316547. Epub 2019 Sep 3.

Exome sequencing in patients with antiepileptic drug exposure and complex phenotypes.

Author information

1
Blackpool Teaching Hospitals NHS Trust, Blackpool, UK adam.jackson@doctors.org.uk.
2
Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester, UK.
3
Division of Evolution and Genomic Science, University of Manchester, Manchester, UK.
4
Paediatric Psychosocial Department, Royal Manchester Children's Hospital, Manchester, UK.
5
Clinical Genetics Department, Guy's and St Thomas' NHS Foundation Trust, Guy's Hospital, London, UK.
6
Department of Clinical Genetics, University Hospitals Leicester NHS Trust, Leicester, UK.
7
Department of Clinical Genetics, University Hospitals Bristol NHS Foundation Trust, Bristol, UK.
8
Clinical Genetics Centre, University of Aberdeen College of Life Sciences and Medicine, Aberdeen, UK.
9
Clinical Genetics Service, Nottingham City Hospital, Nottingham, UK.
10
Department of Clinical Genetics, Ninewells Hospital and Medical School, University of Dundee, Dundee, UK.
11
North West Thames Regional Genetics Service, Northwick Park and St Mark's Hospitals, London, UK.
12
Human Development and Health, Faculty of Medicine, University of Southampton, Southampton, UK.
13
Genetic Medicine, Central Manchester University Hospitals Foundation Trust, Manchester, UK.

Abstract

INTRODUCTION:

Fetal anticonvulsant syndrome (FACS) describes the pattern of physical and developmental problems seen in those children exposed to certain antiepileptic drugs (AEDs) in utero. The diagnosis of FACS is a clinical one and so excluding alternative diagnoses such as genetic disorders is essential.

METHODS:

We reviewed the pathogenicity of reported variants identified on exome sequencing in the Deciphering Developmental Disorders (DDD) Study in 42 children exposed to AEDs in utero, but where a diagnosis other than FACS was suspected. In addition, we analysed chromosome microarray data from 10 patients with FACS seen in a Regional Genetics Service.

RESULTS:

Seven children (17%) from the DDD Study had a copy number variant or pathogenic variant in a developmental disorder gene which was considered to explain or partially explain their phenotype. Across the AED exposure types, variants were found in 2/15 (13%) valproate exposed cases and 3/14 (21%) carbamazepine exposed cases. No pathogenic copy number variants were identified in our local sample (n=10).

CONCLUSIONS:

This study is the first of its kind to analyse the exomes of children with developmental disorders who were exposed to AEDs in utero. Though we acknowledge that the results are subject to bias, a significant number of children were identified with alternate diagnoses which had an impact on counselling and management. We suggest that consideration is given to performing whole exome sequencing as part of the diagnostic work-up for children exposed to AEDs in utero.

KEYWORDS:

anticonvulsant; fetal; genetics; sequencing; valproate

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