Intellectual Developmental Disorder, X-Linked Syndromic, Christianson Type

**Semantic type:** Mental or Behavioral Dysfunction

**Definition:** An X-linked dominant condition caused by mutation(s) in the SLC9A6 gene, encoding sodium/hydrogen exchanger 6. It is characterized by intellectual disability, delayed development, and difficulty standing or walking.

**Synonyms:** - Christianson Syndrome - MRXSCH - Mental Retardation, X-Linked Syndromic, Christianson Type - X-Linked Syndromic Cognitive Disability, Christianson Type