This site is intended for healthcare professionals

Sign in
Go to /sign-in page

You can view 5 more pages before signing in

Mental retardation group

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

Authoring team

To date, there are three distinct mutations on the X-chromosome which produce mental retardation. They are combined into the congenital fragile X syndrome.

The genetic lesions are characterized by:

  • expansion of CGG/CCG repeats
  • very large numbers of repeats, typically 200-2000 in affected individuals
  • there is marked genetic anticipation; larger numbers of repeats result in early onset and severe disease
  • the CGG/CCG repeats are transcribed into non-coding regions of mRNA's

Related pages

Create an account to add page annotations

Create a free account

Annotations allow you to add information to this page that would be handy to have on hand during a consultation. E.g. a website or number. This information will always show when you visit this page.

The content herein is provided for informational purposes and does not replace the need to apply professional clinical judgement when diagnosing or treating any medical condition. A licensed medical practitioner should be consulted for diagnosis and treatment of any and all medical conditions.

Connect

Copyright 2024 Oxbridge Solutions Limited, a subsidiary of OmniaMed Communications Limited. All rights reserved. Any distribution or duplication of the information contained herein is strictly prohibited. Oxbridge Solutions receives funding from advertising but maintains editorial independence.