Understanding Dup15q

Chromosome 15q11.2-13.1 duplication syndrome (dup15q syndrome) is a clinically identifiable syndrome which results from duplications of chromosome 15q11.2-13.1. These duplications most commonly occur in one of two forms. These include an extra isodicentric 15 chromosome, abbreviated idic(15), or an interstitial duplication 15, abbreviated int dup(15). When the extra genetic material comes from the paternal chromosome a child may have normal development. However, when the duplicated material comes from the maternal chromosome, developmental problems are often the result. In most cases of chromosome 15q11.2-13.1 duplication syndrome, the chromosome duplication is not inherited, but occurred as a random event during the formation of reproductive cells (eggs and sperm) or during early embroyonic development.

It is important to acknowledge that there is a wide range of severity in the developmental disabilities experienced by individuals with chromosome 15q11.2-13.1 duplication syndrome. Two individuals with the same dup15q chromosome pattern may be very different in terms of their abilities. Reviews of the scientific literature do not show an obvious correlation between the size of the duplication region and the severity of the symptoms. However, the following features are found to some degree in most individuals with dup15q syndrome.  

Although this website can provide general information on chromosome 15q11.2-13.1 duplication syndrome, you should always consult with your personal physician or genetic counselor for specific details on your situation

Check out this helpful picture to explain duplications on 15q 

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