What causes gonadal mosaicism?

What causes gonadal mosaicism?

Gonadal mosaicism. Another cause of mosaicism is the development of a new mutation during the early embryonic growth of a fetus which affects some, but not all, cells. Yet another type of mosaicism, called gonadal mosaicism, happens when a mutation occurs in a developing fetus’ egg or sperm cells.

What is an example of mosaicism?

Gonadal mosaicism. For example, an older mother is more likely to have a child with an extra chromosome. If this extra chromosome is only present in a fraction of the cells in the child, that person is mosaic because his or her body has some cells with 46 chromosomes (normal) and some cells with 47 (abnormal).

What does it mean to be a genetic mosaic?

A person who is a “genetic mosaic” has cells in his or her body with different genetic makeup. This usually is a variation in the number of chromosomes in the body’s cells. Normally, all body cells would have the same number of chromosomes (46).

How do you test for chromosomal mosaicism?

For chromosomal mosaicism, the test is called a karyotype (an analysis of your chromosomes). Both the number and structure of the chromosomes is examined. If two different populations are found, the blood test is usually repeated to make sure the result is accurate. If it is, mosaicism is diagnosed.