Genetic Investigations in Children With Developmental and Epileptic Encephalopathies in Ho Chi Minh City, Vietnam
Early childhood is one of the periods of life in which the risk to develop epilepsy is
highest. Besides, genetic causes are much more common in the young. Recently, an
ever-increasing amount of genes has been found to be involved in numerous early-onset
epilepsies. Thanks to next-generation sequencing (NGS), a diagnosis can now be reached in
close to 50% of children with epilepsy and developmental delay. This, in turn, has led to
the successful application of the concept of individualized treatment in a growing number
of children with epilepsy. Genetic investigations have thus been progressively included
in the routine work-up of children with early-onset epilepsies throughout the world,
mostly in high-income countries up to now. As a result of a scientific collaboration
between pediatric neurology divisions at University Hospitals Geneva (HUG), Switzerland,
and Children's Hospital 2 in Ho Chi Minh City (HCMC), Viet Nam, genetic testing of
children with early-onset epilepsies followed at the pediatric neurology division,
Children's Hospital 2 started at the genetics laboratory of the Vietnam National
University in 2017.
Aims: Our project aims at establishing the proportion of patients in whom a causal
genetic finding can be identified, in a prospective cohort of children with Developmental
and Epileptic Encephalopathies (DEE) followed at Children's Hospital 2 (ND2). The
investigators also aim at identifying the percentage of these children in whom this
approach would change current management.
Methods: A series of children diagnosed with DEE and followed at ND2 Hospital, enrolled
consecutively. Exome sequencing was applied to all, with biostatistical analyses of a
panel of 671 genes involved in epilepsies and developmental disorders performed in
parallel at Ho Chi Minh City Vietnam National University and Geneva Genetic Medicine
Division. Sanger sequencing confirmation of potentially causal variants in patients, and
in parents for familial segregation. Comparison of Vietnamese and Swiss genetic findings,
and multidisciplinary discussions in formal Genome Boards. Additional genetic
investigations, if deemed necessary in Genome Board sessions. Clinical management adapted
to genetic findings wherever applicable, and follow-up according to standard practice.
One-hundred-and-fifty patients are expected to participate during the 3-year study
period.