What Is Mosaic Down Syndrome?

Q:
What is mosaic Down syndrome?

A:
Mosaic Down syndrome, or mosaicism, is a rare form of Down syndrome. Down syndrome is a genetic disorder that results in an extra copy of chromosome 21. People with mosaic Down syndrome have a mixture of cells. Some have two copies of chromosome 21, and some have three.

Mosaic Down syndrome occurs in about 2 percent of all Down syndrome cases. People with mosaic Down syndrome often, but not always, have fewer symptoms of Down syndrome because some cells are normal.

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Keyword: mosaic down syndrome; mosaic down syndrome+

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