What is Turner syndrome?

Turner syndrome (TS) is a genetic condition in girls in which one X chromosome or part of one of the X chromosomes from some or all cells of the body is missing. This can lead to problems with growth and physical development.

Most girls have two X chromosomes and 46 chromosomes in total. Most boys have one X and one Y chromosome with 46 chromosomes in total. The X and Y chromosomes are called sex chromosomes. The other 46 chromosomes are called autosomes. These chromosomes contain all the genes that control the information for development and how our bodies work throughout life. People with differences in chromosomes often have differences in how their bodies develop. Girls with TS may have only 45 chromosomes in some or all the cells in their bodies. This is because they have lost an X chromosome or a piece of an X chromosome in some or all their cells. This is fairly common, occurring in about 1 in every 2,500 girls.

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