Other Names for this Disease
- Angio-osteohypertrophy syndrome
- Klippel Trenaunay syndrome
- Klippel-Trenaunay-Weber syndrome
- KTW syndrome
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.
Your QuestionHow does Klippel Trenaunay syndrome (KTS) occur? How, if it is not inherited, does it come about? Which gene is associated with it?
We have identified the following information that we hope you find helpful. If you still have questions, please contact us.
Questions on this page
The underlying cause of Klippel-Trenaunay syndrome (KTS) is currently unknown. There have been many theories about what may cause this condition, including:
- paradominant inheritance - a theory that may explain occasional familial cases of sporadic conditions. This theory proposes that a person may inherit a mutation in one copy of a gene responsible for a condition, but another, acquired mutation (somatic mutation) must occur in the other copy of the gene after conception for a person to develop signs and symptoms.
- somatic mosaicism of an otherwise dominant lethal gene
- disturbance of blood vessel formation (vasculogenesis) in the embryonic period
- defects in the mesoderm (one of three layers of an embryo, which gives rise to structures including connective tissue, muscle, and bone)
- various chromosomal translocations and mutations - there have been case reports of these, but none of them have been proven to have any definite association with the condition.
Last updated: 4/21/2015
Studies suggest that KTS may result from gene mutations that are not inherited. These genetic changes, which are called somatic mutations, probably occur very early in development and are present only in certain cells. Somatic mutations could explain why the signs and symptoms of KTS are often limited to specific areas of the body.
Last updated: 1/10/2012
Researchers suspect that KTS may result from changes in one or more genes that regulate the growth of blood vessels during embryonic development. However, to date, no associated genes have been identified.
Last updated: 1/10/2012
- Sharma D, Lamba S, Pandita A, Shastri S. Klippel-trénaunay syndrome - a very rare and interesting syndrome. Clin Med Insights Circ Respir Pulm Med. March 5, 2015; 9:1-4.
- Klippel-Tranaunay Syndrome. Genetics Home Reference. July 2010; http://www.ghr.nlm.nih.gov/condition/klippel-trenaunay-syndrome. Accessed 1/10/2012.