[Neonatal screening of severe combined immunodeficiencies]

Area of Science:

• Immunology
• Genetics
• Pediatrics

Context:

• Severe Combined Immunodeficiencies (SCID) are inherited immune system disorders affecting T-cell development.
• Infants with SCID face life-threatening infections if not diagnosed and treated promptly.
• Newborn screening is crucial as SCID is asymptomatic at birth but fatal within the first year without intervention.

Purpose:

• To evaluate the clinical utility and cost-effectiveness of a nationwide newborn screening program for SCID in France.
• To demonstrate the benefits of universal SCID screening in early detection and improved outcomes.
• To assess the feasibility of using T-cell receptor excision circles (TRECs) for SCID screening.

Summary:

• A prospective nationwide study screened 200,000 French newborns for SCID over two years.
• The screening utilized the quantification of T-cell receptor excision circles (TRECs) in Guthrie samples.
• The study aimed to confirm SCID's suitability for population-based screening due to its treatability and impact on survival.

Impact:

• Early detection of SCID through universal screening significantly improves infant survival.
• Hematopoietic stem cell transplantation, when performed early, enhances immune reconstitution and quality of life.
• The study suggests that universal SCID screening is clinically beneficial and relatively cost-effective despite the disease's low incidence.