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Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"

2q37 deletion syndrome is caused by deletions of genetic material from a specific region in the long (q) arm of chromosome 2. The deletions occur near the end of the chromosome at a location designated 2q37. The size of the deletion varies among affected individuals, with most affected people missing 2 million to 9 million DNA building blocks (also written as 2 Mb to 9 Mb).

Researchers are working to identify all of the genes whose loss contributes to the features of 2q37 deletion syndrome. Many of these genes have not been well characterized. However, genes in this region appear to be critical for the normal development of many parts of the body.

Researchers have determined that loss of a particular gene on chromosome 2, called HDAC4, is likely to account for many of the syndrome's characteristic signs (such as intellectual disability and skeletal abnormalities). While the deleted segment in 2q37 deletion syndrome varies in size, it always contains the HDAC4 gene. Additionally, a few people with mutations in only the HDAC4 gene have many of the features of 2q37 deletion syndrome. It is unclear what role the other genes on 2q37 play in this disorder.

MedlinePlus Genetics: Causes

","key":"forms","title":"What causes 2q37 deletion syndrome?"},{"bodyHtml":"

Unusual physical features are also common in people with 2q37 deletion syndrome. About half of affected individuals have unusually short fingers and toes (brachydactyly), often with abnormally short fourth toes that may overlap the other toes. Additional features of this condition may include short stature, obesity, or sparse hair. Many people with 2q37 deletion syndrome have characteristic facial features that can include a prominent forehead, a low frontal hairline, thin eyelids, skin folds covering the inner corner of the eyes (epicanthal folds), outside corners of the eyes that point upward (upslanting palpebral fissures), a small nose, a small mouth with thin lips, a smooth space between the upper lip and nose (smooth philtrum), prominent cheekbones, a large chin, and minor ear abnormalities.

Other features of 2q37 deletion syndrome can include seizures and an inflammatory skin disorder called eczema. Some affected individuals have malformations of the brain, heart, gastrointestinal system, kidneys, or genitalia. A few people with 2q37 deletion syndrome develop a rare form of kidney cancer called Wilms tumor.

Source: MedlinePlus Genetics

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