Quick Answer: What is meant by genetic mosaic?

What does the medical term mosaic mean?

Mosaic: A person or a tissue that contains two or more types of genetically different cells. All females are mosaics because of X-chromosome inactivation (lyonization). Mosaic patterns can affect the way genetic disorders are expressed.

What does it mean to be a chromosomal mosaic?

Chromosomal mosaicism is defined as the presence of two or more chromosomally distinct cell lines within an embryo or an individual.

What causes mosaic?

Mosaicism may be caused by an error in mitosis. Mitosis (my-TOH-sis) is the dividing of body cells. It’s how a baby in the womb grows. Mitosis causes the number of chromosomes to double to 92, and then split in half back to 46.

What is maternal mosaicism?

Maternal mosaicism When the mother has a population of cells in her body with one X chromosome instead of the usual two. Confined placental mosaicism (CPM) When there is a population of cells in the placenta with one X chromosome. These cells are only in the placenta and are not present in the baby.

What does mosaic mean?

Mosaicism is a condition in which cells within the same person have a different genetic makeup. This condition can affect any type of cell, including: Blood cells. Egg and sperm cells. Skin cells.

What is a mosaic baby?

When a baby is born with Down syndrome, the healthcare provider takes a blood sample to do a chromosome study. Mosaicism or mosaic Down syndrome is diagnosed when there is a mixture of two types of cells. Some have the usual 46 chromosomes and some have 47. Those cells with 47 chromosomes have an extra chromosome 21.

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What causes maternal mosaicism?

Family history of genetic diseases, chromosomal abnormalities, or metabolic disorders. Increased risk for genetic abnormality based on screening tests (such as a nuchal translucency screening, first-trimester blood test, or noninvasive prenatal testing) Abnormal or concerning ultrasound finding.