The Rett Syndrome Association of Ireland

What is Rett Syndrome

Rett syndrome is a rare neurodevelopmental disorder resulting in physical and intellectual disability. It affects girls almost exclusively – affecting one in ten thousand births – but there are rare cases of boys with Rett Syndrome. Everyone affected is severely and multiply disabled. It is characterised by normal early development followed a period of regression where skills are lost. However, Rett Syndrome is not a degenerative condition. Lifelong learning is possible, though difficult. Rett Syndrome is usually diagnosed with a genetic test (based on a blood test) as well as through clinical diagnosis.

Rett Syndrome is caused in most cases by a random mutation or alteration of the MECP2 gene on the X chromosome. It is usually spontaneous and rarely inherited.

Features Of Rett Syndrome

As with any condition there is a large amount of variation in people with Rett Syndrome. However some characteristics can be identified:

  • Children with demonstrate an apparently normal rate of development up to the age of 20 to 30 months.
  • This is followed by a regression period where motor and communication skills that have been acquired degenerate.
  • Apraxia or dyspraxia – the ability of the body to perform motor functions – lead to a loss of verbal skills and hand function.
  • Some lose the ability to walk
  • Stiff or clumsy posture and gait
  • Disorganised breathing patterns
  • Seizures occur in many
  • Scoliosis (curvature of the spine) often with early onset.
  • Repetitive and stereotypical hand movements such as hand winging or hand-mouthing