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Noonan syndrome 4

Other Names for this Disease
  • NS4
  • SOS1 gene related Noonan syndrome
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Noonan syndrome is a genetic disorder that causes abnormal development of multiple parts of the body.[1] Characteristics of the syndrome include a distinctive facial appearance, short stature, a broad or webbed neck, congenital heart defects, bleeding problems, skeletal malformations, and developmental delay.[2][3] Noonan syndrome may be caused by mutations in any one of several genes including the PTPN11, KRASRAF1SOS1NRAS and BRAF genes.[4] It is sometimes referred to as a specific subtype based on the specific, mutated gene that causes the syndrome in an affected individual. It is typically inherited in an autosomal dominant manner, although in many individuals with Noonan syndrome, the mutation occurs for the first time and neither of the parents has the condition.[2][3]
Last updated: 9/28/2012


  1. Haldeman-Englert C. Noonan syndrome. MedlinePlus. 2009; Accessed 3/2/2010.
  2. Noonan syndrome. Genetics Home Reference (GHR). 2007; Accessed 3/2/2010.
  3. Learning About Noonan Syndrome. National Human Genome Research Institute (NHGRI). 2009; Accessed 3/2/2010.
  4. Noonan syndrome. Genetics Home Reference. March 2011; Accessed 7/16/2011.
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Basic Information

  • Genetics Home Reference (GHR) contains information on Noonan syndrome 4. This website is maintained by the National Library of Medicine.
  • MedlinePlus was designed by the National Library of Medicine to help you research your health questions, and it provides more information about this topic.
  • The National Human Genome Research Institute's (NHGRI) mission encompasses a broad range of studies aimed at understanding the structure and function of the human genome and its role in health and disease. Click on the link to view the information page on this topic.
  • The National Organization for Rare Disorders (NORD) is a federation of more than 130 nonprofit voluntary health organizations serving people with rare disorders. Click on the link to view information on this topic.

In Depth Information

  • Medscape Reference provides information on this topic. Click on the link to view this information. You may need to register to view the medical textbook, but registration is free.
  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs.  Access to this database is free of charge.
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Noonan syndrome 4. Click on the link to view a sample search on this topic.