- Premenstrual Syndrome (PMS) Slideshow Pictures
- Take the Menopause Quiz
- What's Causing Your Pelvic Pain Slideshow Pictures
- Patient Comments: Turner Syndrome - Diagnosis
- Patient Comments: Turner Syndrome - Symptoms
- Patient Comments: Turner Syndrome - Treatment
Is Turner syndrome inherited?
Turner syndrome is not usually inherited in families. Turner syndrome occurs when one of the two X chromosomes normally found in women is missing or incomplete. Although the exact cause of Turner syndrome is not known, it appears to occur as a result of a random error during the formation of either the eggs or sperm.
Humans have 46 chromosomes, which contain all of a person's genes and DNA. Two of these chromosomes, the sex chromosomes, determine a person's gender. Both of the sex chromosomes in females are called X chromosomes. (This is written as XX.) Males have an X and a Y chromosome (written as XY). The two sex chromosomes help a person develop fertility and the sexual characteristics of their gender.
In Turner syndrome, the girl does not have the usual pair of two complete X chromosomes. The most common scenario is that the girl has only one X chromosome in her cells. Some girls with Turner syndrome do have two X chromosomes, but one of the X chromosomes is incomplete. In another scenario, the girl has some cells in her body with two X chromosomes, but other cells have only one. This is called mosaicism.
Medically reviewed by James Felicetta, MD; American Board of Internal Medicine with subspecialty in Endocrinology, Diabetes & Metabolism
SOURCE: National Human Genome Research Institute, National Institutes of Health