What is mosaic Down syndrome?

What is the difference between Mosaic Down syndrome and Down syndrome?

Doctors and researchers use the term “mosaicism” to describe a mix of cells in the body. While people with the more common trisomy 21 Down syndrome have an extra chromosome in all of their cells, people with mosaic Down syndrome only have the extra chromosome in some cells.

How long do people with mosaic Down syndrome live?

Current research suggests that individuals with Down syndrome live to 55 yrs of age. The oldest living woman with mosaic Down syndrome lived to the age of 83 years old. With the advances of medical development individuals born in this century should have the same life expectancy as those without extra chromosomes.

Can Mosaic Down syndrome go undiagnosed?

Mosaic Down syndrome is quite often undiagnosed and the average age for this diagnosis is 1-4 yrs. We hope that with this episode many more will get diagnosed to help with not only developmental delays, but more importantly the health risks associated with mosaic Down syndrome.”

Do mosaic embryos have birth defects?

When fertilized, a mosaic embryo sometimes mistakes in cell division occur and cause abnormal cell lines. If these abnormal cells persists, it can cause miscarriages or, in some rare occasions, serious birth defects.

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Does Down syndrome get worse with age?

Adults with Down syndrome experience “accelerated aging,” meaning they will age faster than the general population. It is expected that adults with Down syndrome will show physical, medical, and cognitive signs of aging much earlier than what is expected for their age.

What is the IQ of mosaic Down syndrome?

For example, the average IQ score for the Mosaic Down syndrome group may be 64 but some children may score 70 or more and some 40 or less. The average IQ for the standard Down syndrome group may be 52, but again some children will score 70 or more and some 40 or less.

What is a mosaic person?

Mosaicism is when a person has 2 or more genetically different sets of cells in their body. Chromosomes are stick-shaped structures in the middle of each cell in the body. Each cell has 46 chromosomes grouped in 23 pairs. A person with mosaicism may have some cells in their body with 46 chromosomes.