Allan-Herndon-Dudley syndrome and the monocarboxylate transporter 8 (MCT8) gene.

Abstract:

:Allan-Herndon-Dudley syndrome was among the first of the X-linked mental retardation syndromes to be described (in 1944) and among the first to be regionally mapped on the X chromosome (in 1990). Six large families with the syndrome have been identified, and linkage studies have placed the gene locus in Xq13.2. Mutations in the monocarboxylate transporter 8 gene (MCT8) have been found in each of the six families. One essential function of the protein encoded by this gene appears to be the transport of triiodothyronine into neurons. Abnormal transporter function is reflected in elevated free triiodothyronine and lowered free thyroxine levels in the blood. Infancy and childhood in the Allan-Herndon-Dudley syndrome are marked by hypotonia, weakness, reduced muscle mass, and delay of developmental milestones. Facial manifestations are not distinctive, but the face tends to be elongated with bifrontal narrowing, and the ears are often simply formed or cupped. Some patients have myopathic facies. Generalized weakness is manifested by excessive drooling, forward positioning of the head and neck, failure to ambulate independently, or ataxia in those who do ambulate. Speech is dysarthric or absent altogether. Hypotonia gives way in adult life to spasticity. The hands exhibit dystonic and athetoid posturing and fisting. Cognitive development is severely impaired. No major malformations occur, intrauterine growth is not impaired, and head circumference and genital development are usually normal. Behavior tends to be passive, with little evidence of aggressive or disruptive behavior. Although clinical signs of thyroid dysfunction are usually absent in affected males, the disturbances in blood levels of thyroid hormones suggest the possibility of systematic detection through screening of high-risk populations.

journal_name

Am J Hum Genet

authors

Schwartz CE,May MM,Carpenter NJ,Rogers RC,Martin J,Bialer MG,Ward J,Sanabria J,Marsa S,Lewis JA,Echeverri R,Lubs HA,Voeller K,Simensen RJ,Stevenson RE

doi

10.1086/431313

subject

Has Abstract

pub_date

2005-07-01 00:00:00

pages

41-53

issue

1

eissn

0002-9297

issn

1537-6605

pii

S0002-9297(07)60900-8

journal_volume

77

pub_type

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