Screening for Chromosomal Microarrangements by CGH-array in Developmental Anomalies of the Skin Suggestive of Mosaicism. National Multicentre Descriptive Study.

The principal result expected is the discovery of inframicroscopic chromosomal rearrangements in regions of the genome not yet known to be involved, or mutations in known candidate genes;

The identification of such a mosaic rearrangement in an affected infant would lead to improved genetic counselling. Indeed, as this mosaicism is a consequence of a genetic event occurring at an early stage of embryogenesis, it would be possible to confirm the sporadic nature of the observed disorder and therefore to predict a very low or even negligible risk of recurrence for the couple concerned. For the affected infant, the risk for his/her own offspring will be assessed according to the nature of the genetic anomaly discovered. For medical practice, investigators hope that this study will lead to a clearer definition of the screening modalities for mosaicism in the disorders concerned. In particular, they hope to determine whether or not it is possible to dispense with a skin biopsy, which is more invasive than a blood sample.