How does trisomy 21 mosaicism affect Down syndrome?

Updated: Apr 30, 2018
  • Author: Gratias Tom Mundakel, MBBS, DCH; Chief Editor: Maria Descartes, MD  more...
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Trisomy 21 mosaicism can present with absent or minimal manifestations of Down syndrome and may be underdiagnosed as a cause of early onset Alzheimer disease. [55] The phenotype of persons having mosaicism for trisomy 21 and Down syndrome reflects the percentage of trisomic cells present in different tissues. [56]

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