NCIt definition : A rare, X-linked recessive inherited syndrome caused by mutations in the SLC16A2 (MCT8)
gene. It affects exclusively males and is characterized by mental retardation, limited
mobility, muscle hypoplasia, hypotonia, contractures, and spasticity.;
Alternative definition : NICHD: An X-Linked condition caused by mutation(s) in the SLC16A2 gene, characterized
by elevated triiodothyronine (T3) and decreased reverse T3 concentrations due to inability
to transport T3 across cell membranes. Clinical manifestations include severe cognitive
deficits, hypotonia, and muscular hypoplasia.;