This is a multicenter genetic study aimed at identifying new genes/variants associated with sudden infant death syndrome (SIDS) based on whole-genome sequencing of family trios

The present project is part of a more global project called BIOMINRISK for which 3 axes will be explored: Genetics (a project which will be detailed here), Neurobiology and Radio-anatomical.

This is a multicenter (15 centers), national, non-randomized, open-label, genetic study. Sudden unexpected death in infant (SUDI) cases will be included (i) partly retrospectively (infants already included in the national French SUDI registry) and (ii) for the other cases, prospectively at the time of care of the deceased infant by the referral center of SUDI participating in the project. The parents making up the trios will be included prospectively.

Once the Sudden infant death syndrome (SIDS) cases have been identified among all the included SUDI cases (following the results of post-mortem examinations), Whole Genome Sequencing (WGS) will be carried out on these SIDS cases and their two parents, in order to identify pathogenic allelic variants. The data generated by this sequencing will then be analyzed using a trio approach to search for de novo variants, i.e. variants present in the infant who died of SIDS and absent from the genome of both parents.

Child Inclusion Criteria

• Death of a child between 0 and 2 years of age due to sudden unexpected death in infant
• Child included in the French SUDI registry with effective participation in the biocollection
• Children who also meet the inclusion criteria for the BIOMINRISK-NEUROBIO (axis 2) and BIOMINRISK-RADIO-ANAT (axis 3) studies in the overall BIOMINRISK project.

Parents Inclusion Criteria

• Biological parents of the child included in the BIOMINRISK study
• Parents who have both signed the consent form for blood collection and inclusion of their samples in the biocollection
• parents beneficiaries of a social security or similar scheme

Child Exclusion Criteria:

• Presence of a known metabolic, genetic or syndromic pathology at the time of death

Parents Exclusion Crtiteria:

• Parent under guardianship
• Presence of a known metabolic, genetic or syndromic pathology

The population included will consist of infants who died in the context of SUDI and both their parents. These cases of SUDI will come from the French SUDI registry, which records all cases of SUDI occurring in children under 2 years of age throughout France via a network of referral centers for the management of SUDI.