Mosaicism

        For parents, caregivers, health care providers, and teachers, concerns and questions often arise regarding the care and well-being of individuals with Cornelia de Lange Syndrome. 

Mosaicism, means there are different groups of cells with different genetic make-up in a person. This means that some cells in the person will have the mutation and others will not. Mosaicism has been found to occur frequently in CdLS. 

Approximately 15-20% of individuals with classic features of CdLS have mosaic changes in NIPBL; and although it is rare, individuals with CdLS can also have mosaic changes in SMC3, RAD21 or SMC1A. These mosaic changes cannot be found using genetic testing that examines an individual’s DNA from their white blood cells.

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