PARIS – Routine sampling and analysis of newborn DNA would allow us to screen for many hundreds of childhood genetic diseases. This is the claim made by David Geneviève, MD, PhD, chair of the French Association of Clinical Geneticists and lecturer at the University of Montpellier (France), at the 9th annual conference of the French Society of Predictive and Personalized Medicine.
To date, newborn screening has consisted of taking a drop of blood from a newborn’s heel. In the future, DNA samples could be taken from babies for whole genome sequencing to look for diseases that are likely to crop up later in life.
The challenge
“In France, nearly all of the 720,000 babies born each year undergo newborn screening (only 300 refuse),” said Dr. Geneviève. For 60 years, newborn screening has tested for phenylketonuria, congenital hypothyroidism, congenital adrenal hyperplasia, sickle cell disease, cystic fibrosis, and medium-chain acyl-coenzyme A dehydrogenase deficiency.
On Jan. 1, 2023, France’s national newborn screening program added seven new diseases, bringing the number of rare diseases screened for to 13. The new diseases are homocystinuria, maple syrup urine disease, tyrosinemia type 1, isovaleric acidemia, glutaric aciduria type I, long-chain 3-hydroxyacyl-coenzyme A dehydrogenase deficiency, and carnitine deficiency.
“There aren’t just 13 childhood diseases,” continued Dr. Geneviève. “There are several hundred rare diseases, and genome sequencing tools allow us to broaden our screening capabilities. It’s inevitable that the ability to sequence your child’s genome at birth will become a possibility. It’s highly likely that within 10-15 years, all newborns will have their genome determined at birth for screening purposes.”
Current international trials
Genome sequencing has already been studied for several years in multiple countries. New York’s Guardian study requires all newborns taking part to undergo genome sequencing. “Our English-speaking colleagues use the genome to screen for childhood diseases that would benefit from treatment (235 can be treated) but also as a preventive measure and a way of providing early therapeutic education,” said Dr. Geneviève.
In 2016, American researchers launched the BabySeq Project, which was conducted at several sites (Boston, New York, Birmingham, Detroit, and Philadelphia). One of its aims is to assess the medical, psychological, and financial impact of screening via genome sequencing at birth, compared with conventional screening.
In North Carolina, 25,000 newborns took part in the Early Check study, a neonatal genetic screening project focusing on childhood spinal muscular atrophy, fragile X syndrome, and Duchenne muscular dystrophy.
In the United Kingdom, Genomics England seeks to assess the feasibility, benefits, and risks of whole genome sequencing as part of the Newborn Genomes Programme, an analysis of 100,000 newborn genomes. Projects are also underway in Belgium, Italy, and France (PeriGEN MED in Dijon).
Dijon’s specialist team
The conditions for considering neonatal screening of a disease are determined by the health care authorities in each country and vary greatly from one state to the next.
To date, in France, the only genetic screening authorized is for childhood spinal muscular atrophy via identification of an anomaly on SMN1. It has not yet been implemented, but a pilot study of its use is underway.
“If we are able to identify the 40 newborns affected by spinal muscular atrophy from birth, we can offer these patients gene therapy and stop them from dying at 1 or 2 years of age,” said Dr. Geneviève.
In the future, France should draw up a list of diseases for which genetic screening is useful, he added.
Although France’s initiative for genomic medicine, France Génomique 2025, does not envisage a neonatal genome sequencing screening program, a team in Dijon is studying several dozen genomes to determine the medical and financial benefits of such a program, explained Dr. Geneviève.