Fetal and postnatal growth is finely regulated by genetic, epigenetic and environmental mechanisms. Parental imprinting is a regulatory mechanism that allows monoallelic expression of certain genes from a single parental allele through differential DNA methylation. Imprinted genes play a very important role in the control of fetal and postnatal growth. The pathophysiological mechanisms of these epimutations are largely unknown.

Studying the consequences of these epimutations on the molecular signature of the imprinted gene network in these patients would provide a better understanding of the epigenetic mechanisms regulating fetal growth. As these genes are weakly expressed in fibroblasts, these studies will be carried out on pluripotent stem cells or IPSCs (Induced Pluripotent Stem Cells).

Inclusion Criteria:

1. Minor or young adult patients treated in the department, suffering from rare growth diseases: Silver-Russell syndrome (SRS), Beckwith-Wiedemann syndrome (BWS) and Temple syndrome (TS)
2. For minors, the patient's weight must be ≥ 5 kg

Exclusion Criteria:

• Patients unable to express their opposition to the use of their personal data.

During their follow-up visit, parents and patients who meet the inclusion criteria will be asked to participate in the study. In the case of minors, their personal adhesion will be sought if their capacity of comprehension allows it after adapted written information.

IPD will be sahred with partners

Partners