Allan-Herndon-Dudley syndrome A syndrome that has_material_basis_in mutation at is in the gene encoding the monocarboxylate transporter-8 which alters the structure and function of the SLC16A2 protein which is then unable to transport the thyroid triiodothyronine (T3) hormone into nerve cells of the developing brain affecting normal brain development resulting in intellectual disability and problems with movement. AHDS ALLAN-HERNDON SYNDROME disease_ontology MESH:C537047 GARD:5617 ORDO:59 OMIM:300523 OMIM mapping confirmed by DO. [SN]. DOID:0050631 X-linked recessive disease syndrome