Denna webbplats använder teknik som troligen inte stöds i din webbläsare, därför kan vissa saker se konstiga ut eller inte fungera. Vi rekommenderar att du byter till en modern webbläsare istället.
Skip to main content

Marker chromosome 15 syndrome


  • Idic (15) syndrome
  • Isodicentric 15 syndrome


ICD-10: Q99.8
ORPHA: 3306

Estimated occurrence

3 in 100,000 live births.


These children are born with an extra chromosome, a so-called marker chromosome, which contains genetic material from chromosome 15.

General symptoms

People with marker chromosome 15 syndrome often have intellectual disabilities, low muscle tension, poor locomotor development, autism spectrum disorder and sometimes epilepsy. Many of those affected have stomach and intestinal disorders.

Orofacial/odontological symptoms

There may be some common characteristics in the diagnosis. Many children with this syndrome find it difficult to accept dental treatment and brush their teeth. Some medicines may produce side effects in the form of a dry mouth, which can increase the risk of tooth decay. Problems with sucking, eating and swallowing occur mainly during infancy. Speech, language and communication difficulties are common.

Orofacial/odontological treatment

  • Early contact with dental services for intensified prophylactic care and oral hygiene information is essential for people with Marker chromosome 15 syndrome.
  • Training in oral motor skills and extra stimulation in cases of eating disorders, speech difficulties and impaired saliva control may be necessary.
  • Feeding and swallowing difficulties are investigated and treated by a specialist team at the hospital or multidisciplinary treatment centre.
  • Speech, language and communication training is important.


  • The National Board of Health and Welfare’s knowledge database about rare diagnoses.
  • The MHC – Mun-H-Center – database about oral health and orofacial function in rare diagnoses.
  • The Documentation from the Ågrenska national competence centre for rare diseases. 
Updated: 2017-09-12 13:31