- Mosaic Down Syndrome (1-2% of the instances): Certain cells possess an excess chromosome 21, whereas some possess the normal 46. This type may show less serious symptoms.

The combination of more damage and more Aβ production may promote the growth of amyloid plaques, thus speeding up Alzheimer's progression in people with Down syndrome, Finch explained. The researchers ...

This iron buildup is harmful because it triggers oxidative stress, a process that damages cells by producing toxic molecules.

As October marks World Down Syndrome Awareness Month, it’s an opportune time to learn and support those with the condition. About 5,700 babies are born in the U.S. with Down syndrome each year ...

To mark World Down Syndrome Day on March 21, Fox News contributor Tom Shillue headed to Times Square to speak with a father of a girl with Down syndrome about common misperceptions.

Understanding Down Syndrome goes beyond the basics. Learn about common medical conditions associated with this genetic condition and what experts recommend for better care.

The researchers also studied rare cases of individuals with "mosaic" or "partial" Down syndrome, in which the third copy of chromosome 21 is only present in a smaller subset of the body's cells.