Silver Russell Syndrome (SRS) is a rare imprinting disorder (about 1/16000). Parental imprinting is an epigenetic regulation phenomenon leading to the monoallelic expression of some genes. Its establishment takes place in the gametes and its maintenance is important at the early embryonic stage. Increase in the prevalence of conception by assisted reproductive technology (ART) has already been found in patients with imprinted disorder such as Angelman, Beckwith-Wiedemann or Prader Willi Syndromes, and more recently with SRS; ART is associated with an increase in the frequency of SRS. Several hypotheses are formulated to explain this increase. The first one is the involvement of the infertility etiology in the imprinting disorder genesis. The second one is the involvement of ART technics in the genesis of abnormal gamete imprinting during their manipulation or during imprinting maintenance at early embryonic stages.

Our main objective is to estimate ART conceptions prevalence in children followed for a SRS. The secondary objectives are to estimate infertility prevalence among parents of patients with SRS, to estimate factors frequency possibly responsible for the genesis of imprinting anomalies among parents of patients with SRS, to describe the infertility causes and to detail ART technics used (stimulation protocols, type of fertilization used, modality of embryonic culture and transfer, embryonic characteristics).

A transversal pilote study will be firstly conducted in parents of patients followed in Silver Russell Syndrome Reference Center (Pediatric Endocrine department, in Trousseau Hospital, Paris).

Data collection will be done by phone, after collecting the non-opposition of the parents, in order to complete a questionnaire concerning their fertility and conception mode of their child. If ART was used to conceive, a questionnaire concerning the details of the ART technics used will be sent to the doctor and:or the ART biologist, who performed the ART. The data will be anonymized and collected on a REDCap database.

There is no planned follow-up, and the parents' participation is limited to the telephone interview.

The aim is to conduct / carry out a single-centre observational cross-sectional study, on the one hand by collecting data from the centre's patient files (molecular anomaly leading to the diagnosis of Silver Russell syndrome) and on the other hand by conducting a 30-minute telephone questionnaire to collect additional data. The first part of this questionnaire will be carried out with the parents of these patients in order to specify their age, height, weight, drug consumption and profession at the time of the start of pregnancy, as well as the time required for conception and recourse to ART.

In the event of recourse to ART, with the authorisation of the parent(s), a questionnaire will be sent to the clinical doctor and/or the biologist at the ART centre.

Inclusion Criteria:

• ≥ 18 years old
• parents from patients followed in the department " Unité Fonctionnelle Endocrinienne du Pr Netchine " for un Silver Russell syndrome

Exclusion Criteria:

• parent's objection
• patient under State Medical Aid

Parents of children being followed for Silver-Russell syndrome at the Silver-Russell Syndrome Reference Centre at Trousseau Hospital in the Endocrine Functional Investigation Unit.