• Definition

    Mosaicism is a condition in which cells within the same person have a different genetic makeup. This condition can affect any type of cell, including:

    • Blood cells
    • Egg and sperm cells (gametes)
    • Skin cells

    Alternative Names

    Chromosomal mosaicism; Gonadal mosaicism

    Causes, incidence, and risk factors

    Mosaicism is caused by an error in cell division very early in the development of the unborn baby.

    Examples of mosaicism include:

    • Mosaic Down Syndrome
    • Mosaic Klinefelter Syndrome
    • Mosaic Turner Syndrome